About US Zip Codes
USA is a large country with 50 states and a federal district. Each state has a number of counties, parishes or boroughs, depending on the state. For example, Alaska has boroughs instead of counties, whereas Louisiana has parishes. In 1963, United States Postal Services started a postal code system known as ZIP code to make process of mail delivery easier. ZIP actually stands for Zone Improvement Plan. The basic 5-digit format was first introduced in 1963 and later extended to add an additional 4 digits after a dash to form a ZIP+4 code. This additional 4 digits help USPS more effectively group mail for delivery.
States vs Counties vs Cities
Matching ZIP Codes with States, Counties, and Cities can be tricky. They weren’t made to correspond to existing boundaries such as cities, counties, or even states. Each city may have more than one ZIP code as the ZIP code “boundary” will cross the county or state lines.
If you need a ZIP code database, you can download latest ZIP codes for majority of cities and counties across the USA. Total 43,777 records including city and county names, state abbreviations and individual ZIP code. Just follow instructions below to download the file.
Our ZIP code database will be useful for bulk use, for example to match city to zip code. We sourced the data from Census Bureau as well as popular US real estate sites.