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Colorado population by year, 1990 to 2025

Colorado grew 82 percent from 3.30 million in 1990 to 6.01 million in 2025, moving from 26th to 20th among the 50 states.

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What the data shows

  • Colorado: 3.30M in 1990, 6.01M in 2025 (1.8× higher).

About this chart

Colorado added about 2.7 million residents between 1990 and 2025, taking its population from 3,303,862 to 6,012,561. Most of the jump came early: the 1990s alone added more than a million people, and the state gained 39.0 percent after 2000. Growth has cooled but not stopped, at 19.1 percent since 2010 and about 226,000 more people since 2020.

The state has climbed the rankings steadily. Colorado was 26th among the 50 states in 1990, 24th in 2000, 22nd in 2010 and 20th in 2025. It crossed 5 million in 2010 and 6 million in 2025. The data are Census Bureau resident estimates for July 1.

The data

Source: U.S. Census Bureau population estimates, July 1 (vintages 1999, 2000–2010 intercensal, 2020 and 2025), resident population of Colorado, millions. Retrieved November 4, 2026.

Population of Colorado, Residents, 1990 to 2025, 1990–2025
DateColorado
19903.30M
19913.37M
19923.46M
19933.56M
19943.65M
19953.74M
19963.81M
19973.89M
19983.97M
19994.06M
20004.33M
20014.43M
20024.49M
20034.53M
20044.58M
20054.63M
20064.72M
20074.80M
20084.89M
20094.97M
20105.05M
20115.12M
20125.19M
20135.27M
20145.35M
20155.45M
20165.54M
20175.62M
20185.70M
20195.76M
20205.79M
20215.81M
20225.85M
20235.91M
20245.99M
20256.01M

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Frequently asked questions

What is the population of Colorado?

Colorado had about 6.01 million residents (6,012,561) in July 2025, according to Census Bureau estimates. That ranks 20th among the 50 states, up from 26th in 1990.

How much has Colorado grown since 1990?

Colorado's population is up about 82 percent since 1990, from 3.30 million to 6.01 million. Since 2010 the gain is 19.1 percent.

When did Colorado pass 6 million people?

Colorado's estimate reached 6.01 million in 2025, up from 5.99 million in 2024. It had passed 5 million in 2010.

Where does this data come from?

U.S. Census Bureau population estimates, July 1 (vintages 1999, 2000–2010 intercensal, 2020 and 2025), resident population of Colorado, millions. Retrieved November 4, 2026. You can download the full table as a CSV from this page.

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