Wilton, CA has a population of 4,995 and is the 6,485th largest city in the United States. The population density is 172 per sq mi which is 26% lower than the California average and 90% higher than the national average. The median age in Wilton is 49 which is approximately 36% higher than the California average of 36. In Wilton, 72% of the population over 15 years of age are married, 86% speak English and 10% speak Spanish. 71% of Wilton residents were born in California, 20% were born out of state, 1% were born outside of the United States and 8% were foreign born.