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is a city in Shelby County, Missouri, United States. The population was 682 at the 2000 census. It is the county seat of Shelby County.
Shelbyville is located at (39.807187, -92.041154). According to the United States Census Bureau, the city has a total area of 0.8 square miles (2.1 km²), of which, 0.8 square miles (2.0 km²) of it is land and 0.04 square miles (0.1 km²) of it (4.88%) is water.