adjacent_county_df: Adjacent continental U.S. counties
In davidsovich/usgeogr: An R package for U.S. geographic data.

A dataset containing identifiers for all adjacent (bordering) counties in the 48 continental United States and D.C.

1	adjacent_county_df

A data frame with 18,474 rows (3,109 counties) and 12 variables with unorder duplicates:

county_name: Name of first county.
county_state: Postal service code of first county.
fips_code: County FIPS code for first county, in original string format.
population: Population of first county as of 2010.
lat: Latitude of first county center of population as of 2010.
long: Longitude of first county center of population as of 2010.
neighbor_name: Name of adjacent neighboring county of first county (could be many).
neighbor_state: Postal service code of neigboring county.
neighbor_fips_code: County FIPS code for neigboring county, in original string format.
neighbor_population: Population of neigboring county as of 2010.
neighbor_lat: Latitude of neigboring county center of population as of 2010.
neighbor_long: Longitude of neigboring county center of population as of 2010.