Ladonia is a town in Fannin County, Texas, United States. The population was 667 at the 2000 census, and had increased to 691 by 2009.
The area was first settled around 1840 and originally called McCownville but changed to Ladonia in 1857. Ladonia was supposedly named after La Donna Millsay, a singer from Tennessee that entertained in the community. The population grew late in the 19th century when three railroads, the Gulf, Colorado, and Sante Fe. Ladonia became a shipping point for corn, cotton, and grain crops. Because of this, the population rapidly increased to 1,500 in the 1890s and peaked at over 2,000 by the turn of the century. However, Ladonia suffered through the Great Depression. At a population of 1,199 afterwards, it never recovered as continued to drop to 658 in 1990. The population did, however, increase ever so slightly to 667 in 2000 and 691 before the end of the decade.
Ladonia is located at 33°25′46″N 95°56′48″W / 33.42944°N 95.94667°W / 33.42944; -95.94667 (33.429336, -95.946668).