A DMA (Designated Market Area) is a Nielsen-defined region grouping U.S. counties by local TV viewing patterns. There are 210 non-overlapping DMAs across the U.S. Every county belongs to exactly one DMA. "DMA" and "designated market area" are the same thing.
What Is a DMA (Designated Market Area)?
A DMA (Designated Market Area) is a Nielsen-defined geographic region that groups U.S. counties based on local television viewing patterns. These non-overlapping regions are the industry standard for media measurement and marketing. Nielsen owns the DMA® trademark and assigns each region a unique three-digit code, which it reviews and updates every year.
There are 210 DMAs covering the entire continental U.S., Hawaii, and parts of Alaska. That count held steady into the 2025-26 television season (effective September 27, 2025), and the 210 markets together cover roughly 128.1 million U.S. television households (Nielsen Universe Estimate, 2025-26). Each DMA is an area where local television stations capture a dominant share of viewing, which makes it the working unit for regional media measurement and audience analysis.
Quick Answer:
- Definition: A DMA is a Nielsen-defined region grouping U.S. counties by local TV viewing patterns
- Coverage: 210 DMAs cover the entire continental U.S., Hawaii, and parts of Alaska
- Your DMA: the market named for the city your local TV stations broadcast from
- Key use: media buying, market analysis, and regional marketing strategy
I'm Clyde Christian Anderson, Founder and CEO of GrowthFactor.ai. We help retailers decide where to open next, and DMAs come up in that work constantly: the marketing team buys media by DMA while the real estate team picks sites by trade area. I started evaluating retail real estate at 15 in my family's business, and the lesson has held ever since. The DMA is the right first cut for a market decision, and only the first cut for a site decision.
All 210 DMAs on One Map
Every Nielsen market is plotted below at its first-named city, sized by TV households. The Indigo circles are the 26 largest markets, which together hold half of all U.S. TV homes.
The map shows where each market is anchored, not where its edges run. Nielsen owns the DMA boundary file and licenses it, so we placed each market on public Census city locations instead of tracing lines we don't have the rights to publish.
What Is My DMA?
Your DMA is the market named for the city your local TV stations broadcast from. If the evening news and the weather on your local channels come from Sacramento, you live in the Sacramento-Stockton-Modesto DMA, even if your town is Modesto.
What does "What is your DMA?" mean on a survey?
Surveys and panel signups ask "What is your DMA?" to place you in a media market, so researchers can compare answers market by market. The answer is the market name, not your city or ZIP code. Find the market named for the city your local stations come from in the survey's list, or search your nearest big city in the map above. People near a market edge sometimes get it wrong, because the closest big city isn't always the one whose stations their county watches.
How to find a DMA for an address or a list of ZIP codes
For one address, go by county. Every U.S. county belongs to exactly one of the 210 DMAs, so the county settles it. ZIP codes are the wrong starting point, since a single ZIP can straddle two counties, and those two counties can sit in different markets. The reliable path is ZIP to county to DMA.
For a whole list, such as a CRM export or the ZIPs in a store's trade area, there is no free, official ZIP-to-DMA lookup, because Nielsen licenses its boundary and ZIP-by-DMA data. Here is what actually works:
- Nielsen's own file. Nielsen sells a ZIP Code by DMA report covering more than 51,000 ZIP codes, plus a DMA shapefile and boundary maps. The license is tiered: the reporting-only tier is for internal analysis and cannot be used for ad targeting, media buying or sales, which takes the broader license.
- Your ad platforms. Google Ads lists Nielsen DMA regions as a location target, so a media team can target and report by market without holding the boundary file.
- Free crosswalks, with care. County-to-DMA and ZIP-to-DMA files circulate online. They are unofficial copies of Nielsen's licensed data, often several seasons old, and Nielsen states that its DMA boundaries and data are solely owned by Nielsen. Fine for a rough look, risky for a media plan.
- Check the season. Nielsen reviews every county each year. Jackson County, Alabama moved from the Huntsville market to Chattanooga in 2023 and moved back in October 2024 after a review, so an old file can put a border county in the wrong market.
Finding your DMA tells you your media market, not your trade area. Your DMA is the region you would buy a TV spot in. Your trade area is the much smaller ring a specific store actually draws customers from. For site decisions, the trade area is what matters.
How Are DMAs Determined?
DMAs are determined by analyzing which local TV stations have the dominant share of viewing in each county. Nielsen measures where viewers are tuning in, and each county is assigned to the DMA whose home-market stations it watches most.
Nielsen reviews the assignments every year. A DMA is usually named for its largest city, but it can take in many surrounding counties and sometimes several metro areas. Very large metropolitan regions can be split across more than one DMA so the map reflects how people actually watch.
Nielsen introduced the Designated Market Area in the late 1960s as its answer to Arbitron's Areas of Dominant Influence. When Arbitron left TV ratings in 1993, the DMA became the industry's one shared market map.
How Nielsen measures the viewing behind those boundaries changed recently. Since January 2025, the local-market ratings currency has been a "big data plus panel" model that blends Nielsen's measurement panel with set-top-box and smart-TV data from tens of millions of homes, replacing the older panel-and-diary method used to buy and sell local TV (Nielsen, 2025). The boundaries are the same; the meter behind them is more granular.
Why Do Marketers Use DMAs?
Marketers use DMAs to target regional audiences, allocate budgets, and measure campaign reach inside standard geographic zones. Because every media seller and buyer uses the same 210 markets, a DMA is a unit both sides agree on.
- Regional targeting: campaigns can focus on specific markets and speak to local preferences
- Spend by market size: ad prices follow the number of homes reached, so a spot in New York, the top-ranked DMA, costs more than one in Montgomery, Alabama (see the rankings below)
- Consistent measurement: campaign results compare cleanly across markets defined the same way
- Market prioritization: teams rank DMAs by size, income or competition to decide where to push first
- ROI tracking: tying marketing to sales inside each DMA makes regional return on spend measurable
How Retailers Buy Media by DMA
For a retailer, the DMA is where the marketing plan and the store map meet. Local TV, streaming, radio and a good share of paid social get bought market by market, while every store draws its customers from a trade area a fraction of that size. Three things decide whether the money follows the stores.
Ad platforms don't share one market map
Most teams assume "Dallas" means the same counties everywhere, but a Dallas buy covers different ground depending on the platform:
- Google Ads lists Nielsen DMA regions as a location target type, so a Google DMA buy follows Nielsen's county lines.
- Meta moved its market targeting from Nielsen DMAs to Comscore Markets in June 2026, and ad sets still targeting Nielsen DMAs stopped delivering. Comscore also defines 210 markets, with its own codes (New York is DMA 501 at Nielsen and market 2001 at Comscore) and some different boundaries, so audience sizes shifted with the switch.
- Programmatic and streaming TV buys often target by ZIP list, or by the "metro" code in the OpenRTB bid request, which the spec itself describes as similar to but not exactly Nielsen DMAs.
The practical fix is to keep one table of which counties and ZIPs each of your stores serves, then check each platform's market against it before comparing results across platforms. A market that underperformed on one platform may simply have covered different counties.
Start from the stores, not the rank list
A DMA buy pays for every TV home in the market. Your stores serve the households inside their trade areas, often a 10- to 15-minute drive. Before buying a market, count how many of your stores sit inside it and how much of the market's population lives within reach of one. Three stores clustered on one side of a large DMA can make a market-wide TV buy expensive per customer, while a smaller market where your stores cover most of the population can be the better buy at a lower rank.
Stores near a market edge need a second look. A store on the line between two DMAs draws customers from both, so a buy in only one market reaches part of its trade area, and the store's sales lift can look smaller than the media actually earned.
Test by market, matched on stores
The DMA is the classic unit for matched-market and holdout tests: run the campaign in some markets, hold it back in comparable ones, and read the difference in store sales. Google's own research on geo experiments names the 210 DMAs as one possible set of test regions, because so many ad platforms target by them.
Match test and control markets on what drives your sales, such as store count, store age and sales per store, rather than on TV households, since two markets of the same rank can hold very different store footprints. Keep markets whose stores sit on a shared border out of the same test, or account for the spillover. And if a test ran on Meta across June 2026, remember the market definitions changed partway through.
How Are DMAs Ranked? The Largest U.S. Media Markets
DMAs are ranked by the number of TV households inside them, and that rank is what drives local ad pricing: a spot in New York reaches far more homes than one in Montgomery, Alabama, so it costs far more. The ten largest markets alone hold close to 30% of all U.S. television households, which is why media plans and expansion shortlists both tend to start at the top of the list.
Here are the 15 largest DMAs by TV households for the 2024-25 season:
| Rank | DMA | TV Households |
|---|---|---|
| 1 | New York | ~7.49 million |
| 2 | Los Angeles | ~5.84 million |
| 3 | Chicago | ~3.65 million |
| 4 | Dallas-Fort Worth | ~3.26 million |
| 5 | Philadelphia | ~3.15 million |
| 6 | Houston | ~2.80 million |
| 7 | Atlanta | ~2.76 million |
| 8 | Washington, D.C. (Hagerstown) | ~2.63 million |
| 9 | Boston (Manchester) | ~2.58 million |
| 10 | San Francisco-Oakland-San Jose | ~2.54 million |
| 11 | Tampa-St. Petersburg (Sarasota) | ~2.22 million |
| 12 | Phoenix (Prescott) | ~2.20 million |
| 13 | Seattle-Tacoma | ~2.10 million |
| 14 | Detroit | ~1.94 million |
| 15 | Orlando-Daytona Beach-Melbourne | ~1.90 million |
Source: Nielsen Local TV Market Universe Estimates, 2024-25 season (effective September 28, 2024). At the other end of the list, the smallest market is Glendive, Montana, at #210.
The curve levels off quickly after the top 15. The 26 largest markets contain half of all U.S. TV homes, while the remaining 184 cover the balance, down to Glendive's 4,370 households (Nielsen, 2024-25 season).
The rankings change, but only gradually. In Nielsen's 2025-26 estimates, San Francisco moved ahead of Boston at #9, while Nashville moved ahead of Indianapolis at #25. Those were the only changes among the top 26 for the 2025-26 season; just below them, Salt Lake City passed Pittsburgh for #27. Population drives the ranking, not a change in how the markets are defined.
For an expansion team, the takeaway is that market size is a starting filter, not a site decision. A top-10 DMA can still be saturated block by block, and a #150 market can hold exactly the corner you want.
DMA vs. Designated Market Area: Are They Different?
DMA and designated market area are the same thing. DMA is simply the abbreviation. Nielsen coined both the full phrase and the abbreviation when it formalized the system, and the two appear interchangeably across media planning, retail strategy and location analysis. Searches for "what is a designated market area" and "what is a DMA" are asking the same question.
The only source of confusion is outside U.S. media. In computing, DMA means Direct Memory Access. In EU law, it is the Digital Markets Act. In direct marketing, it was long the Direct Marketing Association, now the Data & Marketing Association. In U.S. retail and media planning, DMA always means Designated Market Area as defined by Nielsen.
How Do DMAs Compare to Other Market Definitions?
A DMA defines a U.S. media market, while a trade area is a custom-defined region where a business draws its customers. The difference is central to location intelligence.
| Feature | DMA (Designated Market Area) | MSA (Metropolitan Statistical Area) | Trade Area (Custom) |
|---|---|---|---|
| Defining Body | Nielsen | U.S. Office of Management and Budget | Your team (in a platform like GrowthFactor) |
| Geographic Basis | Counties with dominant TV viewership | Counties with economic integration + commuting | Store-specific customer origins |
| Primary Use | Media/Advertising reach measurement | Census + economic analysis | Retail/Customer analysis |
| Number in U.S. | 210 | 387 (2023 OMB delineation) | Varies by store |
| Flexibility | Standardized, fixed annually | Standardized, updated periodically | Highly flexible: drive-time, distance, or behavior |
The practical implication for retail teams: DMAs are useful for aligning media spend with store geography. MSAs are more useful for demographic comparison and economic analysis. Trade areas are most useful for evaluating a specific site, because they reflect where your actual customers live and how far they will travel, which neither DMAs nor MSAs measure.
What Is a Trade Area in Retail?
A trade area is a custom region based on where a store's customers actually come from, often a 5-, 10-, or 15-minute drive time, or a shape pulled in by physical barriers, commuter patterns and nearby competitors. Unlike a DMA's fixed annual boundaries, it is specific to one location. A DMA tells you the general market; a trade area tells you where the people walking through the door come from.
How Is DMA Data Used in Modern Site Selection?
DMA data is a first filter for identifying broad regions of interest in site selection, and it is not enough on its own for a final decision. It sizes the media landscape and the general market, a good start for a macro-level market assessment. Choosing a specific site takes the next layer down. DMA analysis is often the first step in a broader retail location analysis.
What Are the Limitations of Relying Solely on DMAs?
- Lack of granularity: DMAs are large, county-based regions that don't capture the micro-markets that suit a particular concept. Within a single DMA, neighborhoods, demographics and competition vary dramatically. San Francisco-Oakland-San Jose is one market for media purposes, but San Jose has very different site economics than Oakland, and the DMA average masks that gap.
- Missing demographic and competitive context: a DMA can be healthy overall while one sub-market inside it is saturated with competitors or a poor fit for your customer.
- Annual updates lag local change: Nielsen updates DMA assignments once a year, so fast local change in roads, housing or employers shows up late, if at all.
Information Gain: What DMA Data Alone Misses
The table below shows the questions a DMA answers versus the questions that need site-level data, the gap any expansion team has to close before a go/no-go decision.
| Question | DMA Data Answers It? | What Fills the Gap |
|---|---|---|
| Is this region big enough to justify entry? | Yes. TV household count is a reliable proxy for market size | n/a |
| What does local TV advertising cost? | Yes. DMA rank directly drives CPM rates | n/a |
| Who are my customers in this region? | Partially. DMA demographics are broad averages | Trade area demographics + psychographics |
| Will foot traffic support a new store? | No | Foot traffic data by address |
| Are competitors already saturating the area? | No | Competitive density mapping |
| Is the site zoned for my use? | No | Parcel-level zoning data |
| How far will customers drive? | No | Drive-time trade area analysis |
| What will this location's revenue look like? | No | Site evaluation + revenue forecasting model |
How Does GrowthFactor Go Beyond DMAs?
GrowthFactor starts where the DMA stops. Your team writes its criteria in a Custom Evaluator, in plain language, the way you would brief an analyst. Give it an address and it pulls the data it needs: demographics and psychographics, foot and vehicle traffic, nearby businesses, cannibalization against your own stores, and analog stores. It returns a rating with the reasoning written out, so anyone on the committee can see which inputs moved it.
- Everything about the site in one place: demographics, foot traffic, competition, zoning and drive-time trade areas sit on one map, next to the market context.
- Your criteria, not an industry average: the evaluator follows the brief your team wrote, and every rating names the data behind it.
- Speed at scale: a full site report comes back in about 10 seconds, which lets a team look at far more candidates per market before committing.
TNT Fireworks shows what faster site work does in a seasonal business, where every market has a narrow window. Using GrowthFactor, the team opened 153 locations in six months, 150 seasonal tents and 3 permanent stores, with site screening 60% faster and every site on budget.
GrowthFactor's AI-driven insights transformed our site selection process, allowing us to make fast, informed decisions.
Kevin Hawk, VP Real Estate, TNT Fireworks
More teams tell the same story on the customer stories page. For the full workflow, see the site selection process and the franchise site selection guide.
Frequently Asked Questions about Designated Market Areas (DMAs)
What is a DMA (Designated Market Area)?
A DMA (Designated Market Area) is a Nielsen-defined geographic region that groups U.S. counties based on which local television stations capture a dominant share of viewing. There are 210 non-overlapping DMAs covering the entire continental U.S., Hawaii, and parts of Alaska. Every county belongs to exactly one DMA, which makes DMAs the standard unit for media buying, audience measurement, and regional market analysis.
What does DMA stand for?
In marketing and media, DMA stands for Designated Market Area, Nielsen's name for the 210 local TV markets in the U.S. The same letters mean other things elsewhere: Direct Memory Access in computing, the Digital Markets Act in EU law, and the Data & Marketing Association (formerly the Direct Marketing Association).
What does "What is your DMA?" mean on a survey?
The survey is asking which local TV market you live in. Answer with the market named for the city your local TV stations broadcast from. If your local news and weather come from Denver stations, your DMA is Denver. Survey lists usually show the Nielsen market names, so pick the one that matches the city on your local news.
How do I find my DMA?
Start with your local TV stations: your DMA is the market named for the city they broadcast from. To be exact, go by county. Every U.S. county belongs to exactly one of the 210 DMAs, while a ZIP code can cross county lines, so the reliable path is ZIP to county to DMA. Nielsen sells the official ZIP-by-DMA file, and ad platforms such as Google Ads list Nielsen DMA regions as a location target.
Is there a free ZIP code to DMA lookup?
Not an official one. Nielsen owns the DMA boundaries and sells its ZIP Code by DMA report, which covers more than 51,000 ZIP codes, under a license; its cheaper reporting-only tier cannot be used for ad targeting or media buying. Free ZIP-to-DMA files circulate online, but they are unofficial copies of that licensed data and often several seasons old. For a single address, your local TV stations or your county will tell you the market.
How many DMAs are there in the U.S.?
There are 210 DMAs covering the entire United States, including parts of Alaska and Hawaii. Each DMA is a non-overlapping territory, meaning every county belongs to only one DMA.
What are the largest DMAs?
By TV households in Nielsen's 2024-25 estimates, the five largest DMAs are New York (about 7.49 million), Los Angeles (5.84 million), Chicago (3.65 million), Dallas-Fort Worth (3.26 million) and Philadelphia (3.15 million). The 26 largest markets hold half of all U.S. TV homes. The smallest is Glendive, Montana, at #210.
Who defines and updates DMAs?
Nielsen defines, measures, and updates DMAs every year based on TV viewing patterns. Nielsen owns the DMA trademark and assigns each region a unique three-digit code, which keeps market measurement consistent across the United States.
Can a city be in more than one DMA?
No. Every county in the U.S. is assigned to a single DMA, so there is no overlap in market measurement. A large metropolitan area can span several counties, and in rare cases those counties fall in different DMAs, but each county belongs to exactly one.
Are DMAs the same as ZIP codes or metropolitan areas?
No. DMAs are built from counties based on local television viewing, not from postal codes or census-defined metro areas. A DMA often lines up roughly with a major metro, but its boundaries follow media market influence. For retail site selection, metropolitan statistical areas (MSAs) and custom trade areas are more precise than DMA boundaries.
What does DMA mean in marketing?
In marketing, DMA means Designated Market Area, Nielsen's name for the 210 regions that define U.S. local television markets. Marketers use DMAs to buy regional media, compare campaign performance across markets, and size a region before committing budget. When someone asks what the DMA is for a campaign, they mean the media market the audience lives in, ranked by TV households.
How do DMAs affect advertising costs?
A DMA's rank, set by its number of TV households, drives what local advertising costs. Top-ranked DMAs like New York and Los Angeles command higher ad rates than smaller markets because each spot reaches far more homes.
Does Meta still use Nielsen DMAs for ad targeting?
No. Meta moved its market targeting from Nielsen DMAs to Comscore Markets in June 2026, and ad sets still targeting Nielsen DMAs stopped delivering. Comscore also defines 210 U.S. markets, but with different codes and some different boundaries, so audience sizes and market-level results can shift. Google Ads still lists Nielsen DMA regions as a location target.
Can a single DMA cross state lines?
Yes. Many DMAs combine counties from more than one state, because broadcast signals and viewing patterns ignore state borders. The New York DMA, for example, includes counties in New York, New Jersey, Connecticut, and Pennsylvania. That's why DMA boundaries rarely line up with state or metro borders.
What is the difference between a DMA and a radio market?
DMAs are television markets defined by Nielsen, and there are 210 of them. Radio markets are smaller and more numerous: Nielsen Audio maintains 302 Radio Metros in the U.S., because radio signals cover less ground than television. The two systems share the Nielsen name but measure different media and use different geographies.
How are DMAs used in political campaigns?
Political campaigns buy local television by DMA to reach voters efficiently. Targeting specific DMAs lets a campaign concentrate spend on competitive regions, tailor messaging to local issues, and measure ad performance market by market, which is why political ad-spend reports are almost always broken out by DMA.
Why are DMAs still relevant in the age of digital advertising?
Regional media habits persist, and DMAs give a standard way to compare markets, including for streaming and digital campaigns. Google Ads still targets by Nielsen DMA, matched-market tests are often run by DMA, and local TV is still bought and priced market by market. Digital targeting can be more precise, but the DMA remains the shared vocabulary for which market a campaign is in.
How does GrowthFactor use DMA data for site selection?
GrowthFactor treats the DMA as market context, the first cut that tells a team which regions are worth a closer look. The decision happens at the site: the team writes its own criteria in a Custom Evaluator, and each candidate address comes back rated against demographics, foot and vehicle traffic, nearby businesses, cannibalization and analog stores, with the reasoning written out. TNT Fireworks used GrowthFactor to open 153 locations in six months, with every site on budget.
How does GrowthFactor compare to Esri for DMA and market analysis?
Esri's ArcGIS is the industry standard for professional GIS, with cartographic depth that typically needs trained analysts to run. GrowthFactor puts market context, demographics, foot traffic and site evaluation in one platform that real estate teams run themselves. Every rating shows the data and reasoning behind it, so a committee sees why a site scored the way it did.
How Can Marketers Turn DMA Data into Decisive Action?
A DMA is the right first cut: it sizes the media market and frames where to look. The marketing team buys the market; the real estate team decides which corner of it gets the next store. Both decisions get better when they share one map of where your customers actually come from.
To see that on one of your own markets, book a demo and bring a market you're weighing.
