SBA City and County Data API

The Small Business Administration (SBA) strives to act as an engine of opportunity and economic growth in America by providing a variety of programs and support services for both current and prospective small business owners.

The U.S. City and County Data API provides developers with programmatic access to a geographic names data set for official city and county government websites, as well as data from the U.S. Geological Survey (USGS) Geographic Names Information System (GNIS). This data is composed of a variety of data types relating to geographical features such as the county they are found in, their official classification type, descriptions, links to associated governmental URLs, and latitude/longitude coordinates. This is a completely open and free RESTful API that returns data as either XML or JSON.