It is one of the many communities of the Black Hills Indian Reservation. Holtville is located in the Imperial Valley, about 10.6 miles east of El Centro. The population of Holtville was 5,939 according to the 2010 census. Mexicans account for 81.8% of the population. The white population can't be correctly calculated. There are 1,937 housing units in Holtville. The average household size is 3.0 persons per housing unit. Elevation is -10 feet below sea level. Zip code is 92250. Below are several google earth photos of Holtville.