- Rural Urban Continuum Codes: A classification scheme that distinguishes metropolitan counties by size and nonmetropolitan counties by degree of urbanization and proximity to metro areas composed by the USDA Economic Research Service. (Free)
- ZIP Code Lookup and Address Information: The official website of the U.S. Post Office provides users with zip code and address information. (Free)
(Free): Available to everyone.
(Law): Available only within the Law School.
(Univ): Available to anyone at Elon University.