The population in Wellsville was 3,432 in 2010, ranking it 103 among 326 places. This represents an increase of 704 from 2,728 in 2000. The largest minority group in 2010 in Wellsville was Hispanic/Latino, which accounted for 2.9 percent of the total population. Households with children under 18 made up 52.2 percent of all households in 2010, a decrease from 58 percent in 2000. Owner-occupied housing units accounted for 87.5 percent of all households in 2010, an increase from 2000 when 85.3 percent of all housing units were owner-occupied.