Ladonia is a town in Fannin County, Texas, United States.

Originally called McCownville, its name was changed to Ladonia in 1857, supposedly in honor of A. T. Donitz.

Its population grew late in the 19th century when the Gulf Colorado Santa Fe Railroad[4] went through Ladonia, making it a shipping point for corn, cotton, and grain crops.

Texas State Highway 50 leads south from Ladonia 14 miles (23 km) to Commerce.

According to the United States Census Bureau, Ladonia has a total area of 2.0 square miles (5.2 km2), all land.

[6] As of the 2020 United States census, there were 597 people, 304 households, and 219 families residing in the town.