Jonca is an unincorporated community in Ste. Genevieve County, in the U.S. state of Missouri. [1]
A post office called Jonca was established in 1880, and remained in operation until 1906. [2] The community took its name from Jonca Creek. [3]
37°50′14″N90°17′56″W / 37.83722°N 90.29889°W / 37.83722; -90.29889
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