 The 2010 United States Census reported that Long Barn had a population of 155.The population density was 53.8 people per square mile (20.8/km²).The racial makeup of Long Barn was 140 (90.3%) White, 1 (0.6%) African American, 3 (1.9%) Native American, 0 (0.0%) Asian, 0 (0.0%) Pacific Islander, 5 (3.2%) from other races, and 6 (3.9%) from two or more races.