Counties usa list Fax: 202-955-0268. The complete list and database of 5-digit US zip codes is available for download in SQL, CSV, YAML, XML, MS Excel, HTML, and PDF formats. Los Angeles is the most populated county in the entire United States. Three of the other counties have Spanish names from the language of the early Hispanic explorers of Arizona. Also a complete list of current and old (extinct) counties for each state. ZIP Code Maps for the Largest Counties in the United States. Click on any of the states and territories below to view a full list of counties, boroughs, parishes, census areas, or independent cities, and learn more about each area. A lock ( ) or https: The spreadsheet contains information about 3143 counties in the United States, including attributes like county names, state names, latitude and longitude coordinates, and population. states' largest cities; List of U. 50 States And Their Capitals County populations also vary widely: in 2017, according to the Census Bureau, more than half the U. tfrviroqxlagipnmqzwoutwuxfuipumjvzdbclrwaviilabjumcjyxqnstzxtgqfmfycvjajhtwyg