From the developer: "US Zip Code database with latitude and longitude. Also provides city, county, state, FIPS code, area code, daylight savings, and time zone for over 42,000 current US zip codes. Also includes the calculations for measuring the distance between zip codes. Data provided in Excel, CSV, and FileMaker Pro formats. Also available are Weblet Zipcodes for performing proximity searches on your web site, and ZipCodes FM for performing proximity searches in FileMaker Pro."