Humanities › Geography 10 Largest Capital Cities in the United States Share Flipboard Email Print Downtown Phoenix, Arizona. Brian Stablyk/ Photographer's Choice/ Getty Images Geography Population Basics Physical Geography Political Geography Country Information Key Figures & Milestones Maps Urban Geography By Amanda Briney Geography Expert M.A., Geography, California State University - East Bay B.A., English and Geography, California State University - Sacramento Amanda Briney, M.A., is a professional geographer. She holds a Certificate of Advanced Study in Geographic Information Systems (GIS) from California State University. our editorial process Amanda Briney Updated November 18, 2020 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. PhoenixPopulation: 1,660,272State: ArizonaLargest City: Phoenix 2. AustinPopulation: 964,254State: TexasLargest City: Houston (2,325,502) 3. ColumbusPopulation: 892,553State: OhioLargest City: Columbus 4. IndianapolisPopulation: 867,125State: IndianaLargest City: Indianapolis 5. DenverPopulation: 716,492State: ColoradoLargest City: Denver 6. BostonPopulation: 694,583State: MassachusettsLargest City: Boston 7. NashvillePopulation: 669,053State: TennesseeLargest City: Nashville-Davidson 8. Oklahoma CityPopulation: 649,021State: OklahomaLargest City: Oklahoma City 9. SacramentoPopulation: 508,529State: CaliforniaLargest City: Los Angeles (3,990,456) 10. AtlantaPopulation: 498,044State: GeorgiaLargest City: Atlanta Sources “U.S. Census Bureau QuickFacts: Phoenix City, Arizona.” Census Bureau QuickFacts.Countries. SkyscraperPage.com.Data Access and Dissemination Systems (DADS). “American FactFinder—Results.” American FactFinder—Results, 5 Oct. 2010.