This list includes 4 US Capitals that start with B, from “Baton Rouge” to “Boston”. They range from large historic hubs to smaller government seats, and suit students, teachers, and trivia fans.
US Capitals that start with B are the state seats whose official capital names begin with the letter B. Notably, Boston is among the nation’s oldest capitals, while Baton Rouge reflects Louisiana’s French colonial history.
Below you’ll find the table with Capital, State, and Population (year).
Capital: Shows the official capital name so you can identify each city quickly and confirm alphabetical order.
State: Lists the state associated with each capital so you can place the city geographically and understand regional context.
Population (year): Provides the latest population figure with its year so you can compare city sizes at a glance.
US Capitals that start with B
| Capital | State | Country | Population (year) | Description |
|---|---|---|---|---|
| Baton Rouge | Louisiana | United States | 227,470 (2020) | Louisiana’s state capital on the Mississippi River; known for its Creole and Cajun-influenced culture and proximity to Louisiana State University. |
| Bismarck | North Dakota | United States | 73,622 (2020) | North Dakota’s capital on the Missouri River; named for Otto von Bismarck and a regional center for state government and energy industries. |
| Boise | Idaho | United States | 235,684 (2020) | Idaho’s capital and largest city, set along the Boise River by the foothills; popular for outdoor recreation and a growing tech and cultural scene. |
| Boston | Massachusetts | United States | 675,647 (2020) | Massachusetts’ capital and New England’s largest city; a historic Revolutionary-era hub with world-class universities, museums, and cultural institutions. |