Vandenberg AFB, CA has a population of 3,483 and is the 8,069th largest city in the United States. The population density is 158 per sq mi which is 32% lower than the California average and 74% higher than the national average. The median age in Vandenberg AFB is 23 which is approximately 35% lower than the California average of 36. In Vandenberg AFB, 71% of the population over 15 years of age are married, 84% speak English and 11% speak Spanish. 30% of Vandenberg AFB residents were born in California, 61% were born out of state, 5% were born outside of the United States and 5% were foreign born.