We see many references to Trinity Mills in northern Dallas County. A marker stands in Carrollton entitled “Trinity Mills Community” which tells a condensed version of how the little community came to be.
About 1851, brothers W.H. and Preston Witt began building a steam mill on the property of brother-in-law A.W. Perry 1/10 mile north of here to serve settlers in Dallas and Denton counties. In 1855, Perry sold his interest to W.H. Witt. By 1858, a store and post office named Trinity Mills were added. The Scott family bought the business after the Civil War. They later platted and sold 50 acres to the railroad for a depot. The community prospered by farming and mining gravel but eventually the store closed in 1915; the depot in 1923. The gravel operation ceased in 1966.
The area was part of Alexander Wilson Perry’s land grant and was named for a grist mill once owned by Perry and a relative by marriage, Wade Hampton Witt. The actual grist mill was first powered by oxen on a treadwheel and housed in a late-1840s two-story rock structure. It had its own post office for a while and a small settlement grew up around it. Eventually the community was annexed and absorbed by Carrollton.
