Colby Flag

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.

5.6K
Total Population
1,520
Density (mi²)
-11 -0.2%
Growth

Colby Population

Colby Population

Data after 2023 is projected based on recent change

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 and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White4,93291.52%
Other race2174.03%
Two or more races1302.41%
Black or African American971.8%
Asian120.22%
Native American10.02%

Colby Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

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

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)