MetaTransitioning to Comscore Markets for automotive model ads
Summary
Meta is transitioning from Nielsen's Designated Market Area (DMA) to Comscore Markets for automotive model ads targeting, effective June 22, 2026. This change, announced on February 26, 2026, aims to provide a more sustainable and scalable partner solution for long-term performance and measurement. Advertisers can begin updating their vehicle offer feeds from March 23, 2026, by replacing the 'dma_codes' field with 'Comscore Market IDs' as an array of strings.
Meta will provide a mapping table to convert existing DMA codes. On April 20, 2026, notifications will be issued for feeds still using dma_codes. After June 22, all campaigns relying on DMA codes will pause and must be updated with Comscore Market IDs to resume delivery.
This transition allows advertisers to leverage a more robust regional targeting system, ensuring continued effective campaign management.
Analyst Note
This transition from Nielsen DMAs to Comscore Markets® for automotive ad targeting signals a broader industry shift away from legacy measurement frameworks. What's notable here is the timing: Meta is phasing out DMAs in mid-2026, but the migration period begins in March 2026, giving advertisers a narrow window to update feeds and mapping. For UA and monetization teams, the practical impact is immediate – any campaigns still using dma_codes after June 22 will pause, risking spend disruption.
The key implication is that automotive advertisers must treat Comscore Market IDs as a required field, not an optional upgrade. This move aligns with privacy-driven changes (e.g., deprecation of third-party cookies) where granular, deterministic geo-targeting is giving way to aggregated, scalable solutions. Competitively, Comscore Markets may offer better coverage and sustainability than Nielsen's DMAs, but the forced migration could cause short-term friction for teams without automated feed management.
Ad ops professionals should prioritize mapping dma_codes to Comscore IDs now, using Meta's provided conversion table, and validate feeds via Catalog Manager to avoid delivery pauses during the Q2 transition window.
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