Bonsall, CA has a population of 4,294 and is the 7,121st largest city in the United States. The population density is 320 per sq mi which is 38% higher than the California average and 254% higher than the national average. The median age in Bonsall is 47 which is approximately 31% higher than the California average of 36. In Bonsall, 75% of the population over 15 years of age are married, 82% speak English and 13% speak Spanish. 57% of Bonsall residents were born in California, 28% were born out of state, 2% were born outside of the United States and 14% were foreign born.