The population in Alta was 383 in 2010, ranking it 241 among 326 places. This represents an increase of 13 from 370 in 2000. The largest minority group in 2010 in Alta was Hispanic/Latino, which accounted for 4.2 percent of the total population. Households with children under 18 made up 7.1 percent of all households in 2010, a decrease from 22.4 percent in 2000. Owner-occupied housing units accounted for 21.2 percent of all households in 2010, a decrease from 2000 when 61.2 percent of all housing units were owner-occupied.