Alta, IA has a population of 2,104 and is the 10,724th largest city in the United States. The population density is 1,952 per sq mi which is 3473% higher than the Iowa average and 2055% higher than the national average. The median age in Alta is 37 which is approximately 3% lower than the Iowa average of 38. In Alta, 67% of the population over 15 years of age are married, 86% speak English and 12% speak Spanish. 72% of Alta residents were born in Iowa, 21% were born out of state, 1% were born outside of the United States and 6% were foreign born.