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Simpsonville is a small unincorporated town in northwestern Upshur County, Texas, United States. According to highway signage and road maps this community is named Thomas. The local oral history is that the name was changed because a U.S. Post Office was opened here in the early Twentieth Century and another Texas town of a similar name also had a Post Office. The "new" name may have reflected the name of the Postmaster or of a prominent member of the community.

Municipalities and communities of Upshur County, Texas County seat: Gilmer Cities Clarksville City‡ | East Mountain‡ | Gilmer | Gladewater‡ | Ore City | Union Grove | Warren City‡ Town Big Sandy Unincorporated communities Diana | Enoch | Kelsey | Simpsonville Footnotes ‡This populated place also has portions in an adjacent county or counties