Dynamap/1000 is a vector based, digital, geographic database in which streets and features are represented as line segments. Each side of a street or feature has associated data such as Census codes and Federal Information Processing Standards (FIPS) codes. The internal street network database contains nearly every street in the nation. The data is available for all 50 states and Puerto Rico.
Select data by State or data layer/theme
http://www.bts.gov/programs/geographic_information_services/download_sites/gdt/maindownload.html