Augusta is the capital city of the U.S. state of Maine. The city's population was 18,899 at the 2020 census, making it the 12th-most populous cit…Augusta is the capital city of the U.S. state of Maine. The city's population was 18,899 at the 2020 census, making it the 12th-most populous city in Maine, and third-least populous state capital in the United States after Montpelier, Vermont, and Pierre, South Dakota. Augusta is the seat of and most populous city in Kennebec County.
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