Colby, Kansas Population 2021

5,464
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Colby is a city located in Thomas County Kansas. It is also the county seat of Thomas County. With a 2020 population of 5,464, it is the 59th largest city in Kansas and the 4530th largest city in the United States . Colby is currently growing at a rate of 0.87% annually and its population has increased by 1.43% since the most recent census, which recorded a population of 5,387 in 2010. Colby reached it's highest population of 5,544 in 1980. Spanning over 4 miles, Colby has a population density of 1,474 people per square mile.

The average household income in Colby is $71,123 with a poverty rate of 13.33%. The median rental costs in recent years comes to $634 per month, and the median house value is $125,500. The median age in Colby is 33.3 years, 32.2 years for males, and 34.9 years for females.

Colby Demographics

According to the most recent ACS, the racial composition of Colby was:

  • White: 93.57%
  • Black or African American: 3.23%
  • Asian: 1.22%
  • Other race: 1.02%
  • Native American: 0.51%
  • Two or more races: 0.44%
  • Native Hawaiian or Pacific Islander: 0.00%
The current population of Colby, Kansas is 5,464 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 5,323.The last official US Census in 2010 recorded the population at 5,387.

Colby, Kansas Population 2021

Population by Race

Race Population Percentage
White5,12193.57%
Black or African American1773.23%
Asian671.22%
Some Other Race561.02%
American Indian and Alaska Native280.51%
Two or More Races240.44%
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Colby Population by Race

Colby Population Pyramid $2021

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Colby Median Age

33.3


Total

32.2


Male

34.9


Female

Colby Adults

There are 4,332 adults, (772 of whom are seniors) in Colby.

Colby Age Dependency

53.7

Age Dependency Ratio

21.7

Old Age Dependency Ratio

32.1

Child Dependency Ratio

Colby Sex Ratio

Female

2,872

52.48%

Male

2,601

47.52%

Colby Population by Age

Colby Renter vs Owner Occupied by Household Type

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Colby Household Types

Type Owner Renter
Married89.9%10.1%
All61.1%38.9%
Female37.9%62.1%
Non Family37.8%62.2%
Male27.1%72.9%

61.1%

Rate of Home Ownership

Colby Households and Families

Type Count Average Size Owned
All2,3892.1361.1
Married1,096389.9
Non Family8881.2437.8
Female2611.7837.9
Male1441.7227.1

2.57

Average Family Size

2.13

Average Household Size

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Colby Households by Type

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Education Attained Count Percentage
Less Than 9th Grade671.96%
9th to 12th Grade2256.58%
High School Graduate83124.29%
Some College1,09431.98%
Associates Degree53715.70%
Bachelors Degree50614.79%
Graduate Degree1614.71%
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Colby Educational Attainment by Sex (over 25)

Colby Educational Attainment by Race

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Race Total High School Bachelors
White3,0572,867579
Hispanic16710312
Black13613653
Asian612323
Other Race4343
Native American223
2+ Races1212

The highest rate of high school graduation is among black people with a rate of 100.00%.

The highest rate of bachelors degrees is among black people with a rate of 38.97%.

Colby Educational Attainment by Race

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Name Average Male Female
Overall$36,445$47,837$31,979
Less Than 9th Grade$$$19,007
High School Graduate$29,917$30,750$27,417
Some College$41,571$50,951$33,812
Bachelors Degree$32,411$54,000$29,207
Graduate Degree$66,310$86,771$43,942

$36,445

Average Earnings

$47,837

Average Male

$31,979

Average Female

Colby Earnings by Educational Attainment

Colby Language by Age

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Colby Language

94.92% of Colby residents speak only English, while 5.08% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 3.32% of the population.

Colby Language

Colby Poverty by Race

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Name Total In Poverty Poverty Rate
White4,56957412.56%
Black1365338.97%
Hispanic2694516.73%
Other422354.76%
Native2222100.00%

13.33%

Overall Poverty Rate

12.40%

Male Poverty Rate

14.18%

Female Poverty Rate

Poverty in Colby

The race most likely to be in poverty in Colby is Native, with 100.00% below the poverty level.

The race least likely to be in poverty in Colby is White, with 12.56% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.47%. Among those working part-time, it was 39.84%, and for those that did not work, the poverty rate was 17.45%.

Colby Poverty

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Name Poverty
Less Than 9th Grade33.45%
High School13.81%
Some College10.55%
Bachelors or Greater0.00%

Colby Poverty Rate by Education

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Rate Poverty
Female Unemployed100.00%
Male Employed16.05%
Female Employed11.69%
Male Unemployed0.00%

Colby Poverty Rate by Employment Status and Sex

Colby Income by Household Type

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Name Median Mean
Households$56,358$71,123
Families$71,061$76,899
Married Families$84,118-
Non Families$23,696$59,201
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Income by Household Type

Colby Marital Status

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Marriage Rates

51.5%

Overall Marriage Rate

51.7%

Male Marriage Rate

51.3%

Female Marriage Rate

Colby Married by Age and Sex

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Colby Marriage

The age group where males are most likely to be married is 35-44, while the female age group most likely to be married is 35-44.

Colby Marital Status by Race

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Colby Marital Status

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232

Number of Veterans

230

Male Veterans

2

Female Veterans

War Veterans
Vietnam99
Korea39
First Gulf War9
World War II4
Second Gulf War

Colby Veterans by War

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Age Group Veterans
65 to 74111
75+80
55 to 6432
35 to 549
18 to 34

Colby Veterans by Age

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Colby Veterans by Race

Colby Veterans by Education

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14.67%

Veteran Poverty Rate

57.33%

Veteran Disability Rate

Colby Veterans by Education

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70.4%

Labor Force Participation

68.5%

Employment Rate

2.7%

Unemployment Rate

Colby Employment by Age

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Colby Employment by Race

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Colby Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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65.92%

Born in Colby

94.06%

Native Born

5.94%

Foreign Born

4.09%

Non Citizen

1.85%

Naturalized

Place of Birth

94.06% of Colby residents were born in the United States, with 65.92% having been born in Kansas. 4.09% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Colby Place of Birth

Year Population Growth Annual Growth Rate
20215,464470.87%
20205,417470.88%
20195,370470.88%
20185,323-72-1.33%
20175,395-12-0.22%
20165,407-23-0.42%
20155,430621.15%
20145,368-45-0.83%
20135,413-3-0.06%
20125,416-6-0.11%
20115,42250.09%
20105,417-33-0.06%
20005,450540.10%
19905,396-148-0.27%
19805,5448861.76%
19704,6584481.02%
19604,2103510.87%
19503,8590.00%

Colby Population by Year