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County Equivalents
The following maps were imported from Census data obtained from ftp://ftp.census.gov/pub/tiger/boundary/county/
1990 County - The first order-division of each State are counties for 48
States, parishes for Louisiana, and boroughs and census areas for Alaska.
In addition, the Census Bureau treats the following entities as equivalents
of counties for purposes of data presentation: independent cities in
Maryland, Missouri, Nevada, and Virginia; the portion of Yellowstone
National Park in Montana; "District of Columbia" for the District of
Columbia; municipios in Puerto Rico; and a variety of entities in the
outlying areas. The 5-digit county geocode consists of a 2-digit State FIPS
code and a 3-digit FIPS county code.
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