Windsor is a city in Henry and Pettis counties, Missouri, United States. The population was 2,901 at the 2010 census. Windsor was laid out in 18…Windsor is a city in Henry and Pettis counties, Missouri, United States. The population was 2,901 at the 2010 census. Windsor was laid out in 1855, and originally known as Belmont. Its name was changed to Windsor in 1859, after Windsor Castle, in England. A post office called Windsor has been in operation since 1850.
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