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is a city in and the county seat of Marshall County, Minnesota, United States. The population was 1,678 at the 2000 census.
U.S. Route 75 and Minnesota Highway 1 are two of the main arterial routes in the city.
According to the United States Census Bureau, the city has a total area of 1.4 square miles (3.7 km²). 1.4 square miles (3.7 km²) of it is land and none of it is covered by surface water. The Snake River flows in serpentine fashion through the city (hence its name), and there is development on both banks. This has proved problematic as the city attempts flood control. Some major floods in the city's history occurred in 1896 (twice), 1969, 1974, 1979, 1996 (twice), and 1997.
The streets of the original townsite of Warren are laid out on a grid parallel and perpendicular to the Burlington Northern Santa Fe Railroad. Some newer additions, particularly those south of Bridge Street (Minnesota Highway 1) are laid out on a conventional north-south grid. The BNSF is the dividing line for the street system east and west, and Bridge Street is the dividing line north and south.