What a pair these are: they sound identical and look nearly identical and both have meanings that relate to government. Mastering their use, however, is simple.
The key is this: capitol, the one with an "o," is very limited in use. It appears in the term Capitol Hill, and is used to refer to one very particular and famous building, to some other similar buildings, and, occasionally, to a group of buildings that includes those similar buildings. For all other meanings, the word you want is capital.
This means that in a state's capital city is a building or group of buildings properly referred to with the word capitol, with an "o." In this use capitol is synonymous with statehouse: both refer to the building or group of buildings where a state legislature meets. The phrase capital city utilizes capital because it refers to a city, not to a building or group of buildings.
Capitol with a capital "C" refers to the particular building in Washington, D.C. where the U.S. Congress meets. It often appears before other nouns in phrases like the Capitol building and Capitol police, and is very frequently used in the term Capitol Hill, which refers both to the legislative branch of the United States government as well as to the location of the Capitol building. The Capitol, like many state capitol buildings, has a rounded dome that is somewhat reminiscent of the top of an "o," which may help some remember the "o" spelling. Note that the word capital as used to describe an uppercase letter, like in the phrase capital "C", utilizes capital.
The word capital has three distinct homographs, two for noun uses and one for adjective uses. Readers should consult those entries for the various meanings of capital, but can be assured that they all end in al, rather than ol.
Examples of Capitol Hill in a Sentence
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The Context Gabbard in March testified on Capitol Hill that Iran is not building a nuclear weapon and that the country's supreme leader, Ayatollah Ali Khamenei, had not authorized the nuclear weapons program.—Sonam Sheth
gabe Whisnant, MSNBC Newsweek, 20 June 2025 Ahead of Juneteenth, proponents of reparations for African Americans met last week with mostly Democratic lawmakers on Capitol Hill to urge them to continue the push for federal reparations legislation.—Deborah Barfield Berry, USA Today, 20 June 2025 The matter will be decided, however, by Republicans on Capitol Hill.—Patrick Gleason, Forbes.com, 19 June 2025 On Capitol Hill, there is broad support in both parties for Israel, but there is also fear about getting drawn into a larger war in the Middle East.—Kristina Karisch, The Hill, 19 June 2025 See All Example Sentences for Capitol Hill
Word History
Etymology
Capitol Hill, Washington, site of the U.S. Capitol
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