Cromwell is a city in Carlton County, Minnesota, United States. The population was 240 at the 2020 census. Cromwell is located along Mi…Cromwell is a city in Carlton County, Minnesota, United States. The population was 240 at the 2020 census. Cromwell is located along Minnesota State Highways 73 and 210. The post office was established at Cromwell in 1882. Cromwell was organized in 1891, receiving its name from the Northern Pacific Railway. Cromwell was incorporated in 1903.
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