Section
ZIP Codes
City ZIP code lookups, sourced from USPS/Census-derived postal data -- full lists, county breakdowns, and the edge cases (unique-purpose ZIPs, cross-county splits) most lists skip.
Atlanta ZIP Codes: The Full List, and Why Some Say Fulton and Others Say DeKalb
Every ZIP code USPS assigns to Atlanta, Georgia -- which of the two counties each one actually sits in, why several Atlanta suburbs mail-address as their own separate cities, and the one Atlanta ZIP that belongs to the IRS.
New York City ZIP Codes: All 311, by Borough
NYC's five boroughs use 311 ZIP codes between them -- and Queens is the one borough where the ZIP code map doesn't run through neighborhood names most outsiders have never heard of, not the borough name itself.
Texas ZIP Codes: How the State's 2,600 Codes Are Organized
Texas doesn't have one ZIP code system, it has a range spanning 73301 to 88595 -- and which major city has the most ZIP codes isn't the one with the most people.