The​ United States of America is one of the world's largest countries, based on both area (3.797 million square miles) and population (over 327 million). It is made up of 50 individual states and Washington, D.C., its national capital. Each of these states also has its own capital city and other very large and small cities.

These state capitals vary in size, and some are very large when compared to other, small capital cities, but all are important to politics. Interestingly, though, some of the largest and most important cities in the U.S., like New York City, New York and Los Angeles, California, are not the capitals of their states.

The following is a list of the ten largest capital cities in the U.S. For reference, the state that they are in, along with the population of the state's largest city (if it is not the capital) have also been included. The city population figures are census estimates for 2018.

1. Phoenix

Population: 1,660,272

State: Arizona

Largest City: Phoenix

2. Austin

Population: 964,254

State: Texas

Largest City: Houston (2,325,502)

3. Indianapolis

Population: 867,125

State: Indiana

Largest City: Indianapolis​

4. Columbus

Population: 892,553

State: Ohio

Largest City: Columbus

5. Denver

Population: 716,492

State: Colorado

Largest City: Denver

6. Boston

Population: 694,583

State: Massachusetts

Largest City: Boston

7. Nashville

Population: 669,053

State: Tennessee

Largest City: Nashville-Davidson

8. Oklahoma City

Population: 649,021

State: Oklahoma

Largest City: Oklahoma City

9. Sacramento

Population: 508,529

State: California

Largest City: Los Angeles (3,990,456)​

10. Atlanta

Population: 498,044

State: Georgia

Largest City: Atlanta