Mount Rainier, MD is a city located in Prince Georges County, Maryland and has a land area of 0.73 square miles (1.89 km2). The water area for the city is 0.00 square miles or 0.00 km2. There is one unique zip code in Mount Rainier, Maryland and it is 20712. The area code(s) for Mount Rainier is 240/301.
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