The variety of counties containing urban population increased from 19 in 1790 to 2424 in 2010. Also, in 2010, there have been 7,754 146 pixels (1 km2), 72,271 census tracts, 35,532 county subdivisions, and three,535 urban areas in the conterminous US. There have been 9 census divisions (δ: D1 – D9) and 7 Areas (μ: R1 – R7) with fixed boundaries over time,
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