Transitioning to Comscore Markets for automotive model ads

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.