Detailed boundaries for Maryland counties from Maryland iMap.
Format
A data frame with 24 rows and 6 variables:
statefp
State FIPS code for Maryland
countyfp
County FIPS code
name
County name
geoid
Unique county GeoID (concatenation of state and county FIPS codes)
namelsad
Concatenated variable length geographic area name and legal/statistical area description (LSAD)
geometry
Multipolygon with the county boundary