City in Thomas County, Kansas · 3.7 sq mi · 1,492 people per sq mi
5,463 people live in Colby. The typical household earns $63,494, and the median resident is 32.3 years old.
2026 projection
From 5,570 in 2020
Poverty rate 8%
Men 32.2 · Women 32.5
1890–2026
5,463
2026 projection
1.9% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1890–2026
5,463
2026 projection
1.9% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 5,463 | -26 | 0.47% |
|---|---|---|---|
| 2025 | 5,489 | -14 | 0.25% |
| 2024 | 5,503 | -37 | 0.67% |
| 2023 | 5,540 | -36 | 0.65% |
| 2022 | 5,576 | -39 | 0.69% |
| 2021 | 5,615 | +45 | 0.81% |
| 2020 | 5,570 | +23 | 0.41% |
| 2019 | 5,547 | +48 | 0.87% |
| 2018 | 5,499 | -74 | 1.33% |
| 2017 | 5,573 | +19 | 0.34% |
Showing 10 of 29 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
Colby has a population change higher than Thomas County, and lower than Kansas and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 54 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 13 residents
49% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 49% | 51% | 47% |
| Never married | 33% | 36% | 31% |
| Divorced | 10% | 9% | 11% |
| Widowed | 7% | 4% | 10% |
| Separated | <1% | <1% | 0% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources