Colby is a city in and the county seat of Thomas County, Kansas, United States.

 Country : United States
 State : Kansas
 County : Thomas
 Sister Cities :
 Colby, NE (north)
 Colby, WY (northwest)
 Colby, IA (northeast) 
 Colby, OK (south)
 Colby, NM (southwest)
 Colby, AR (southeast)
 Adacjent Cities :
 Levant, KS (west)
 Halford, KS (east)
 Chardon, KS (north) 
 Monument, KS (south)
 Winona, KS (southwest)
 Oakley, KS (southeast) 
 Bird City, KS (northwest)
 Achiles, KS   (northeast)
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