Bonham is a city and is the county seat of Fannin County, Texas, United States. The population was 10,408 at the 2020 census. James Bonh…Bonham is a city and is the county seat of Fannin County, Texas, United States. The population was 10,408 at the 2020 census. James Bonham sought the aid of James Fannin at the Battle of the Alamo. Bonham is part of the Texoma region in northern Texas and southern Oklahoma.
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