| install_data_package | Install the 'USAboundariesData' package after checking with the user |
| states_contemporary_lores | U.S. state boundaries |
| state_codes | State codes and abbreviations for U.S. states and territories |
| state_plane | Projections from the State Plane Coordinate System |
| state_proj | Data for projections from the State Plane Coordinate System |
| USAboundaries | USAboundaries: Historical and Contemporary Boundaries of the United States of America |
| us_cities | City locations and populations (historical and contemporary) |
| us_congressional | Congressional district boundaries (contemporary) |
| us_counties | County boundaries (contemporary and historical) |
| us_states | State boundaries (contemporary and historical) |
| us_zipcodes | Zip Code Tabulation Areas (contemporary) |