County land area

Is there any ready-made table containing land area for U.S. counties? NHGIS provides shapefiles but I cannot find any table.

NHGIS doesn’t have a data table with land area for US counties, but the county shapefiles from 2010 to the present do provide that information. There is a field called “AREALAND” in the shapefile, and it contains the land area for each county (in square meters). There is also a field called “AREAWATER” that contains the water area for each county.

Unfortunately, the county shapefiles for 1790-2000 do not have an land area field in them.

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Concerning this question I am actually wondering what unit of measurement is the area done in? Feet? acres?