County FIPS code County seat Established Population Area Adams County 001 Brighton 1902‑11‑15 441,603 1,182.29sqmi; (3,062km) Alamosa County 003 Alamosa 1913‑03‑08 15,445 723.21sqmi; (1,873km) Arapahoe County 005 Littleton 1861‑11‑01 572,003 804.41sqmi; (2,083km)
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