Hilmar-Irwin, CA has a population of 5,250 and is the 6,247th largest city in the United States. The population density is 1,337 per sq mi which is 475% higher than the California average and 1376% higher than the national average. The median age in Hilmar-Irwin is 44 which is approximately 22% higher than the California average of 36. In Hilmar-Irwin, 62% of the population over 15 years of age are married, 52% speak English and 23% speak Spanish. 58% of Hilmar-Irwin residents were born in California, 15% were born out of state, 0% were born outside of the United States and 26% were foreign born.