Cumby is a city in Hopkins County, Texas, United States. The population was 777 at the 2010 census, up from 616 at the 2000 census. In 202…Cumby is a city in Hopkins County, Texas, United States. The population was 777 at the 2010 census, up from 616 at the 2000 census. In 2020, its population was 679. Originally known as Black Jack Grove as early as 1848, from 1857 to 1858 the post office was renamed to Theodocias. It was renamed again to Black Jack Grove before being renamed a final time to Cumby in 1896. It was named for Confederate army veteran Robert H. Cumby.
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