Derby, CO -- U.S. Census Designated Place in Colorado Population (2000): 6423 Housing Units (2000): 2145 Land area (2000): 1.638168 sq. miles (4.242835 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.638168 sq. miles (4.242835 sq. km) FIPS code: 20275 Located within: Colorado (CO), FIPS 08 Location: 39.838785 N, 104.917082 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Derby, CO Derby