Arapahoe County was established November 1, 1861, named for the Arapaho Indian tribe. Littleton is the county seat. County Demographics: population was 391,511 in 1990 and 482,089 in 1999; location is 39°39'N 104°20'W; land area is 803.17 square miles (514,027 acres); water area is 2.30 square miles (1,473 acres). Source: US Census Bureau.
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