Blue Ridge is a city at the intersection of state highway 78, FM 981, and FM 545 in Collin County, Texas, United States. The population was 8…Blue Ridge is a city at the intersection of state highway 78, FM 981, and FM 545 in Collin County, Texas, United States. The population was 822 at the 2010 census, and 1,180 in 2020. Blue Ridge is named for the blue flowers found on the hills around the area by early settlers.