Colby

County:: Thomas County
County Seat:: Yes
Area (mi²):: 3.661
State:: Kansas

Colby is a city located in Thomas County, Kansas. Colby has a 2025 population of 5,566. It is also the county seat of Thomas County. Colby is currently declining at a rate of -0.2% annually and its population has decreased by -1.01% since the most recent census, which recorded a population of 5,623 in 2020.

The average household income in Colby is $84,830 with a poverty rate of 8.24%. The median age in Colby is 32.7 years: 32.4 years for males, and 33 years for females.

Demographics

The racial composition of Colby includes 91.52% White, 4.03% other race, and smaller percentages for Two or more races, Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Other race

Two or more races

Black or African American

Asian

Native American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	4,932	91.52%
Other race	217	4.03%
Two or more races	130	2.41%
Black or African American	97	1.8%
Asian	12	0.22%
Native American	1	0.02%
Native Hawaiian or Pacific Islander	0	0%

Colby Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Colby's average per capita income is $45,095. Household income levels show a median of $66,731. The poverty rate stands at 8.24%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$106,702	-
Families	$96,855	$110,262
Households	$66,731	$84,830
Non Families	$29,118	$49,983

$45,095

Average Income

$66,731

Median Household Income

8.24%

Poverty Rate