Alta is a city in Buena Vista County, Iowa, United States.

[4] Halvor H. Peterson (1831–1917), Wisconsin State Assemblyman and farmer, lived in Alta.

According to the United States Census Bureau, the city has a total area of 1.07 square miles (2.77 km2), all land.

[7] As of the census of 2020,[9] there were 2,087 people, 776 households, and 519 families residing in the city.

There were 835 housing units at an average density of 774.4 per square mile (299.0/km2).

Hispanic or Latino persons of any race comprised 23.2% of the population.

There were 838 housing units at an average density of 783.2 per square mile (302.4/km2).

28.5% of all households were made up of individuals, and 14.7% had someone living alone who was 65 years of age or older.

There were 791 housing units at an average density of 755.1 per square mile (291.5/km2).

25.8% of all households were made up of individuals, and 14.2% had someone living alone who was 65 years of age or older.