Alamosa East is an unincorporated community and a census-designated place (CDP) located in and governed by Alamosa County, Colorado, United States.

The population of the Alamosa East CDP was 1,453 at the 2020 United States census.

[3] The Alamosa post office (Zip code 81101) serves the area.

[4] The Alamosa East CDP has an area of 2,079 acres (8.414 km2), all land.

[3] The United States Census Bureau initially defined the Alamosa East CDP for the 1970 United States census.