List of counties in Maine
| Counties of Maine | |
|---|---|
 |
|
| Location | State of Maine |
| Number | 16 |
| Populations | 16,931 (Piscataquis) – 289,977 (Cumberland) |
| Areas | 370 square miles (960 km2) (Sagadahoc) – 6,829 square miles (17,690 km2) (Aroostook) |
| Government | County government |
| Subdivisions | cities, towns, plantations, unincorporated territories, census designated place, Indian Reservations |
This is a list of the sixteen counties in the U.S. state of Maine. Before statehood, Maine was officially part of the state of Massachusetts and was called the District of Maine. Maine was granted statehood on March 15, 1820 as part of the Missouri Compromise. Nine of the sixteen counties had their borders defined while Maine was still part of Massachusetts, and hence are older than the state itself. Even after 1820, the exact location of the northern border of Maine was disputed with Britain, until the question was settled and the northern counties took their final, official form by the Webster-Ashburton Treaty, signed in 1842. Almost all of Aroostook County was disputed land until the treaty was signed.
The first county to be created was York County, created as York County, Massachusetts by the government of the Massachusetts Bay Colony in 1652 to govern territories it claimed in southern Maine. No new counties have been created since 1860, when Knox County and Sagadahoc County were created. The most populous counties tend to be located in the southwestern portion of the state, along the Atlantic seaboard. The largest counties in terms of land area are inland and further north. Maine's county names derive from a mix of British, American, and Native American sources, reflecting Maine's pre-colonial, colonial, and national heritage.
The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify states and counties, is provided with each entry. Maine's code is 23, which when combined with any county code would be written as 23XXX. The FIPS code for each county links to census data for that county.
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