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Colorado vs Utah population, 1990 to 2025

Colorado leads Utah in 2025 population: 6,012,561 vs 3,538,904. Compare annual state data from 1990.

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What the data shows

  • Colorado: 3.3M in 1990, 6M in 2025 (1.8× higher).
  • Utah: 1.7M in 1990, 3.5M in 2025 (2.0× higher).

About this chart

Colorado had the larger population in 2025: 6,012,561 versus 3,538,904 for Utah, a gap of 2,473,657. Over the full period from 1990, Colorado grew by 82.0%, while Utah grew by 104.6%. Colorado was ahead in 1990 and remained ahead at every annual observation in the displayed series. The comparison uses the same reference year for both states.

The Census series compares July 1 resident populations for Colorado and Utah. In 1990, their counts were 3,303,862 and 1,729,722, respectively. Estimates from different Census vintages are joined across decades, and revisions can affect the measured trend. These state totals include residents throughout each state rather than only its cities. They describe the scale and direction of population change but do not, on their own, separate births, deaths and migration.

The data

Source: U.S. Census Bureau population estimates, July 1 (vintages 1999, 2000–2010 intercensal, 2020 and 2025), people. Retrieved November 5, 2026. July 1 resident population estimates. Different Census vintages are joined across decades; revisions can affect comparisons.

Colorado vs Utah population, Resident population, 1990 to 2025, 1990–2025
DateColoradoUtah
19903.3M1.7M
19913.4M1.8M
19923.5M1.8M
19933.6M1.9M
19943.7M1.9M
19953.7M2M
19963.8M2M
19973.9M2.1M
19984M2.1M
19994.1M2.1M
20004.3M2.2M
20014.4M2.3M
20024.5M2.3M
20034.5M2.4M
20044.6M2.4M
20054.6M2.5M
20064.7M2.5M
20074.8M2.6M
20084.9M2.7M
20095M2.7M
20105M2.8M
20115.1M2.8M
20125.2M2.9M
20135.3M2.9M
20145.4M2.9M
20155.5M3M
20165.5M3M
20175.6M3.1M
20185.7M3.2M
20195.8M3.2M
20205.8M3.3M
20215.8M3.3M
20225.9M3.4M
20235.9M3.4M
20246M3.5M
20256M3.5M

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Frequently asked questions

Which has a larger population, Colorado or Utah?

Colorado had the larger population in 2025, at 6,012,561 compared with 3,538,904 for Utah. The gap was 2,473,657 residents.

How have Colorado and Utah changed since 1990?

Colorado moved from 3,303,862 to 6,012,561, a 82.0% increase. Utah moved from 1,729,722 to 3,538,904, a 104.6% increase.

What exactly is being compared?

Census July 1 resident population estimates for the two whole states. The series combines Census vintages and does not isolate the causes of population change.

Where does this data come from?

U.S. Census Bureau population estimates, July 1 (vintages 1999, 2000–2010 intercensal, 2020 and 2025), people. Retrieved November 5, 2026. July 1 resident population estimates. Different Census vintages are joined across decades; revisions can affect comparisons. You can download the full table as a CSV from this page.

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