Federal information processing standards codes (FIPS codes) are a standardized set of numeric or alphabetic codes issued by the National Institute of Standards and Technology (NIST) to ensure uniform identification of geographic entities through all federal government agencies. The entities covered include: states and statistically equivalent entities, counties and statistically equivalent entities, named populated and related location entities (such as, places and county subdivisions), and American Indian and Alaska Native areas.
States have a two digit code, and counties add three more digits.
FIPS codes are frequently used to Link/join a data base to a county or state shape file.
Get FIPS codes at http://www.epa.gov/enviro/html/codes/state.html
Last revision 9/10/2015