Holtville (formerly, Holton) is a city in Imperial County, California. Take a look below for 10 interesting and amazing facts about Holtville, California, United States. 1. Holtville is located 10.5 miles (17 km) east of El Centro. 2. The population was 5,939 at the 2010 census, up from 5,612 in 2000. 3. The city was…