Colby, Kansas

Colby, Kansas
City and County seat
Thomas County Courthouse (2014)
Location within Thomas County and Kansas
KDOT map of Thomas County (legend)
Coordinates: 39°23′05″N 101°02′43″W
Country	United States
State	Kansas
County	Thomas
Founded	1885
Incorporated	1886
Named after	J.R. Colby
Area
• Total	3.58 sq mi (9.27 km2)
• Land	3.58 sq mi (9.27 km2)
• Water	0 sq mi (0.00 km2)
Elevation	3,166 ft (965 m)
Population  (2020)
• Total	5,570
• Density	1,560/sq mi (601/km2)
Time zone	UTC-6 (CST)
• Summer (DST)	UTC-5 (CDT)
ZIP code	67701
Area code	785
FIPS code	20-14650
GNIS ID	485557
Website	cityofcolbyks.gov

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Colby is a city in and the county seat of Thomas County, Kansas, United States. As of the 2020 census, the population of the city was 5,570. It is located on the north side of Interstate 70.