Exeter, CA has a population of 10,504 and is the 3,799th largest city in the United States. The population density is 4,265 per sq mi which is 1735% higher than the California average and 4607% higher than the national average. The median age in Exeter is 32 which is approximately 12% lower than the California average of 36. In Exeter, 55% of the population over 15 years of age are married, 72% speak English and 28% speak Spanish. 72% of Exeter residents were born in California, 15% were born out of state, 1% were born outside of the United States and 12% were foreign born.