McLendon-Chisholm is a city in Rockwall County, Texas, United States. The population was 1,373 at the 2010 census. McLendon-Chisholm i…McLendon-Chisholm is a city in Rockwall County, Texas, United States. The population was 1,373 at the 2010 census. McLendon-Chisholm is situated along State Highway 205 in south central Rockwall County, approximately six miles southeast of Rockwall.