Highland is an unincorporated community and census-designated place in Howard County, Maryland, United States. As of the 2020 census it had a population of 1,133. It uses the 20777 zip code. The community is located in southern Howard County at the junction of Highland Road, Maryland Route 216 and Maryland Route 108, and is still heavily influenced by …Highland is an unincorporated community and census-designated place in Howard County, Maryland, United States. As of the 2020 census it had a population of 1,133. It uses the 20777 zip code. The community is located in southern Howard County at the junction of Highland Road, Maryland Route 216 and Maryland Route 108, and is still heavily influenced by its agrarian history; farms and horse fields are common in the area. The crossroads itself has a small-town feel, with various shops including some that share in the town history. Clarksville is 2 miles to the north on MD 108, Laurel is 9 miles to the southeast on MD 216, and Olney is 7 miles to the west on MD 108. The center of Columbia is 8 miles to the northeast.