To buy a mailing list by ZIP code, you can either purchase a from a data vendor for specific demographics or use the USPS Every Door Direct Mail (EDDM) service for blanket geographic coverage . While the USPS does not sell address lists directly, specialized companies provide verified consumer and business data that can be filtered by ZIP code, carrier route, or a radius around an address. Option 1: Buy a Targeted Mailing List
This is best if you need to reach specific types of people (e.g., homeowners, high-income households) within a certain ZIP code. You receive a downloadable file with names and addresses. Every Door Direct Mail (EDDM) - Targeted Mail Marketing buy mailing list by zip code