Lompoc, CA has a population of 43,678 and is the 941st largest city in the United States. The population density is 3,758 per sq mi which is 1517% higher than the California average and 4048% higher than the national average. The median age in Lompoc is 33 which is approximately 9% lower than the California average of 36. In Lompoc, 50% of the population over 15 years of age are married, 60% speak English and 36% speak Spanish. 58% of Lompoc residents were born in California, 20% were born out of state, 2% were born outside of the United States and 20% were foreign born.