ZIP Code Lookup
Enter any address in the United States and this free service from the United States Postal Service will verify the address and return the zip + 4 code.

Zip Code Decoder
Enter any zip code in the United States and this free service from the United States Postal Service will provide you with the City and State.

County Decoder
Enter a zip code in the United States and this site will return the correct County & State.

Social Security Number Allocations
Did you know the first three digits of a Social Security Number determines the states of issuance? The chart on this website shows the first 3 digits of the social security numbers assigned throughout the United States and its possessions.