|Headquarters||Osage, Iowa, United States|
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Fox River Mills, Inc., is a sock manufacturer based in Osage, Iowa.
The company was founded in 1900. In 1992, they purchased the Nelson Knitting Company of Rockford, Illinois, and in the process acquired the trademark on the Red Heel socks used to make sock monkeys. Fox River Mills includes instructions for making a sock monkey in every packet of Red Heel socks.