Holtville is a census-designated place and unincorporated community in Elmore County, Alabama, United States. Its population was 4,940 as of the 2020 census. Holtville/Slapout is located on the western bank of Jordan Lake, and much of its population lives along this lakeshore, or in the neighboring Lightwood community. According to tradition, the old name of Slapout was derived from a storekeeper's way of stating an item was out of stock: he was "slap out of it".