By Ben Dyer | Head of Growth, Webtopia

Action required: From 20 April 2026, new campaigns cannot be created using Nielsen DMA targeting. From 22 June 2026, all existing campaigns using Nielsen DMAs will stop delivering and must be updated before they can restart.

Meta is replacing Nielsen Designated Market Area (DMA) targeting and reporting with Comscore Markets across all of its advertising products. Nielsen DMAs, a geo-targeting system that groups US television markets into named regions, have been used in Meta Ads Manager for location-based audience targeting and campaign reporting since the platform's early days. Comscore Markets, which has been available as an alternative since August 2025, will become the only supported standard from June 22, 2026. If you or your agency currently use DMA-based targeting, you need to act before two specific deadlines. Here is what is changing, why it matters, and what to do about it.

What Are Nielsen DMAs and Who Uses Them?

Nielsen's Designated Market Areas are geographical regions defined by television viewing patterns across the United States. There are 210 DMAs, each centred around a major city and covering the surrounding area where local TV viewership is attributed to that market. New York, Los Angeles, Chicago, and Philadelphia are examples of major DMAs. The system was developed to help television advertisers buy and measure local audiences, and it has been used by digital advertising platforms including Meta as a convenient, standardised way to define geographic targeting.

For DTC brands, DMA targeting on Meta is relevant in a few specific scenarios. The most common is geographic campaign testing: running Meta ads in a limited set of markets to measure the impact on sales or brand lift in those areas before rolling out nationally. This approach, sometimes called a geo lift test, relies on DMA boundaries as the unit of measurement because they provide clean, mutually exclusive geographic segments. If your agency has ever proposed a US geo test or a market-level spend analysis using Meta's reporting tools, DMAs are almost certainly the framework they used.

The other context is reporting. If you pull Meta campaign reports segmented by geography and you see named market areas in the US rather than simply states or cities, those are likely DMA-based reports. From June 22, those segments will no longer appear in Ads Manager reporting, the Insights API, or Advanced Analytics. Historical data tied to DMA labels will need to be retrieved before that date.

The Two Deadlines and What Happens If You Miss Them

Meta has communicated two specific dates that require action from advertisers currently using DMA-based targeting.

The first is April 20, 2026. After this date, it is no longer possible to create new campaigns using Nielsen DMA targeting in Meta Ads Manager. If you were planning a geo-targeted campaign for Q2 or the summer season that uses DMA audience definitions, you have a very short window to build those campaign structures before this option is removed. Existing campaigns already using Nielsen DMA targeting are not affected on April 20, but no new ones can be created.

The second, more significant deadline is June 22, 2026. This is when Nielsen's DMAs will be fully removed from Meta's advertising products. All existing campaigns using Nielsen DMA targeting will stop delivering on this date and will need to be updated with Comscore Markets as the replacement targeting definition before they can restart. Meta's Marketing Mix Modelling data exports will also switch from Nielsen DMA to Comscore Markets at this point, and Nielsen DMA segments will be removed from Ads Manager reporting, the Insights API, and Advanced Analytics.

The practical risk for brands that do not act before June 22 is campaign downtime. If you are running always-on DMA-targeted campaigns, and your agency has not already transitioned them to Comscore Markets, those campaigns will simply stop on June 22 with no automated transition. The ad spend stops. The audience reach stops. You will need to manually update the targeting and restart.

What Is Comscore Markets and How Is It Different?

Comscore Markets is a geo-targeting and measurement framework from Comscore, a media measurement company, that defines US geographic markets based on digital audience behaviour and media consumption patterns rather than television viewership. It has been available in Meta Ads Manager, the Insights API, and Advanced Analytics since August 2025.

The core difference between Nielsen DMAs and Comscore Markets is the underlying methodology. Nielsen's DMAs were defined by where people watch local television. Comscore's markets are defined by digital and cross-platform audience data. As digital consumption has increasingly diverged from broadcast television patterns, the argument for Comscore's framework is that it better reflects how audiences actually behave across the channels where advertising now runs.

For most practical purposes, Comscore Markets cover similar geographic areas to Nielsen DMAs, since both systems are ultimately grouping US geography into named regional units. The naming conventions differ, and the precise boundaries are not identical, but the transition should not require a fundamental rethink of geo-targeting strategy. It requires a remapping of DMA-based audiences to their Comscore Market equivalents and an update to any reporting that uses DMA labels.

Meta has indicated that advertisers can refer to Comscore's own naming convention documentation to map their existing DMA segments to the corresponding Comscore Markets. If you use geo-based reporting to analyse performance by US market, you will need to update any dashboards, spreadsheets, or reporting templates that reference Nielsen DMA labels before June 22, or you will lose continuity in your geographic performance data.

What to Do Right Now: A Practical Checklist

The first step is to establish whether your campaigns are affected. Log in to Ads Manager and check the targeting configuration for any active US campaigns. If you see targeting defined by named Nielsen DMA regions, you are affected by the June 22 deadline. If your targeting uses states, cities, postcodes, or radius-based geography, you are not using DMA targeting and the deadline does not affect your active campaigns.

If you find campaigns with DMA targeting, the next step is to identify the Comscore Market equivalent for each DMA you are using and update the targeting configuration accordingly. This does not need to happen before April 20 for existing campaigns, but it needs to be completed before June 22. Given that campaign changes can require a new learning phase, updating sooner rather than leaving it to the last week is advisable.

The second action is to retrieve historical Nielsen DMA data from your reporting tools before June 22. If you have multi-year performance data in Meta's reporting that is segmented by DMA, download that data now while it is still accessible. Once the transition is complete, those labels will no longer be available in Meta's interface. This matters particularly if you use DMA performance data for planning or for comparing campaign results across different geographic markets over time.

The third action, relevant if you use Meta's Marketing Mix Modelling data exports or run geo lift tests through Meta's Experiments tool, is to speak with your Meta account team or the agency managing your account about how the transition affects your specific measurement setup. Geo lift tests that use DMA boundaries as the experimental unit will need to be redesigned around Comscore Markets going forward. If you have a test in flight that uses DMA definitions, check whether it concludes before June 22 or whether it needs to be adjusted.

Why Meta Is Making This Change

Meta describes the transition as part of its strategy to offer partner solutions that meet advertisers' performance and measurement needs and are sustainable and scalable for the long term. The less diplomatic framing is that Nielsen DMA data is expensive to license, is built for a broadcast television world that no longer reflects how audiences consume media, and Comscore's digital-first measurement methodology is a better fit for a platform where virtually all audience behaviour is digital.

This transition is consistent with a broader direction in Meta's measurement strategy in 2026. The platform is moving away from third-party audience definitions that were designed for other contexts and toward measurement frameworks that are built around the digital signals Meta actually has. This includes the shift toward Incremental Attribution as a more causally accurate measurement model, and the expansion of first-party data tools that allow advertisers to connect their own CRM data to Meta's delivery systems.

For a deeper understanding of how Meta is changing its attribution and measurement frameworks more broadly, our guide to Meta Incremental Attribution covers the attribution model that is increasingly replacing standard last-click measurement across Meta campaigns.

What This Means for Your Agency Relationship

If you work with a Meta ads agency, the Comscore transition is a question worth asking about directly. Ask whether any of your active campaigns use Nielsen DMA targeting and whether they have a transition plan in place before June 22. The answer should be clear and specific.

An agency that is managing your account well will already be aware of this change, will have identified which campaigns are affected, and will be working through the targeting update now rather than in late June. An agency that is not aware of this deadline, or that has not communicated it to you proactively, has a gap in their platform awareness that is worth understanding before the campaign downtime it will cause becomes your problem.

This is not a complex technical challenge. It is a straightforward platform administration task that requires awareness of the deadline and a methodical update to affected campaigns. The complexity lies in identifying which campaigns are affected and ensuring the targeting remapping is accurate, neither of which requires specialist knowledge. What it requires is attention to platform communications, which is a basic expectation of anyone managing significant Meta advertising spend on your behalf.

If you are evaluating your agency relationship or want to understand what best-in-class Meta campaign management looks like for a DTC brand at your stage, our overview of Meta Andromeda explains the AI delivery changes that are transforming how Meta campaigns need to be structured and managed in 2026.