The population in Cornish was 288 in 2010, ranking it 264 (tied with Emery) among 326 places. This represents an increase of 29 from 259 in 2000. The largest minority group in 2010 in Cornish was Hispanic/Latino, which accounted for 12.2 percent of the total population. Households with children under 18 made up 51.8 percent of all households in 2010, a decrease from 54.8 percent in 2000. Owner-occupied housing units accounted for 85.5 percent of all households in 2010, an increase from 2000 when 84.9 percent of all housing units were owner-occupied.