ZIP codes in an area
Pick a state first, then submit once to load its counties and metros.
What the list contains
A county's list holds every ZIP code whose area lies mostly in that county; a ZIP code that crosses a county line is listed once, under the county with the larger share, and its own page shows the split. A metro area's list holds every ZIP code in its member counties, because the Office of Management and Budget defines metro and micro areas as whole counties. A state's list includes PO-box and single-organisation ZIP codes, which have no area but do have a state.
The list copies as plain text, one ZIP code per line, ready to paste into a spreadsheet, a CRM filter or an ad platform's location targeting. The CSV adds the city, county FIPS code, time zone, coordinates, population and median household income of each.