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is a city on the Missouri River in Franklin County, Missouri, United States. The population was 13,243 at the 2000 census.
Washington is located at (38.551879, -91.013313). According to the United States Census Bureau, the city has a total area of 9.0 square miles (23.4 km²), of which, 8.6 square miles (22.1 km²) of it is land and 0.5 square miles (1.3 km²) of it (5.42%) is water. The city has a mild humid subtropical climate.