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is a city in Audrain County, Missouri, United States. The population was 11,320 at the 2000 census. It is the county seat of Audrain County. The Mexico Micropolitan Statistical Area consists of Audrain County. Citizens of Mexico, Missouri are known as "Mexicoans" and not "Mexicans". Mexico hosts the annual Miss Missouri Pageant; the winner goes on to represent the state of Missouri in the Miss America pageant.
Mexico is located at (39.165814, -91.884761). N.E. of the centre of the state, and about 110 m. N.W. of St Louis. According to the United States Census Bureau, the city has a total area of 11.7 square miles (30.3 km²), of which, 11.4 square miles (29.4 km²) of it is land and 0.3 square miles (0.9 km²) of it (2.90%) is water.