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is a city in Prince George's County, Maryland, United States. The population was 8,498 at the 2000 census. Bordering Washington, DC, Mount Rainier got its start as a streetcar suburb. (
) According to local tradition, surveyors from the Pacific Northwest named the town, giving the streets names such as "Shasta" and "Cascade". Historic U.S. 1 runs through the center of the town and serves as the main street and central business district.
According to the United States Census Bureau, the city has a total area of 0.6 square miles (1.7 km²), all of it land.