Colby, KS Profile: Facts, Map & Data


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Colby, Kansas - Basic Facts

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The City of Colby had a population of 5,416 as of July 1, 2017. Colby ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Kansas. See peer rankings below.

The primary coordinate point for Colby is located at latitude 39.3851 and longitude -101.0455 in Thomas County. The formal boundaries for the City of Colby (see map below) encompass a land area of 3.52 sq. miles and a water area of 0 sq. miles. Thomas County is in the Central time zone (GMT -6). The elevation is 3,159 feet.

The City of Colby (GNIS ID: 485557) has a C5 Census Class Code which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Beneath the boundary map are tables with Colby population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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City of Colby, KS Boundary Map

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Colby, KS Data & Demographics (As of July 1, 2017)


Total Population 5,416
Daytime Population: Workers 3,421
Daytime Population: Residents 2,681
Total Daytime Population (TDP) 6,102
Ratio TDP/Total Population1 1.13
Population in Households 5,093
Population in Familes 3,868
Population in Group Qrtrs 323
Population Density2 1,539
Diversity Index3 23


Median Household Income $43,502
Average Household Income $67,267
Per Capita Income $28,044


Total Housing Units 2,431 (100%)
Owner Occupied HU 1,384 (56.9%)
Renter Occupied HU 823 (33.9%)
Vacant Housing Units 224 ( 9.2%)
Median Home Value $107,576
Average Home Value $149,855


Total Households 2,207
Average Household Size 2.31
Family Households 1,319
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.07% 0.06%
Households -0.02% -0.01%
Families -0.01% -0.12%
Median Household Income   1.39%
Per Capita Income   2.33%

Colby, KS - Peer Comparisons by Rank and Percentile

The table below compares Colby to the other 671 incorporated cities, towns and CDPs in Kansas by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 60 91st
Population Density # 100 85th
Diversity Index # 206 70th
Median Household Income # 487 28th
Per Capita Income # 210 69th

Additional comparisons and rankings can be made with a VERY EASY TO USE Kansas Census Data Comparison Tool.

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