Irwindale, CA has a population of 1,319 and is the 13,471st largest city in the United States. The population density is 149 per sq mi which is 36% lower than the California average and 65% higher than the national average. The median age in Irwindale is 38 which is approximately 6% higher than the California average of 36. In Irwindale, 52% of the population over 15 years of age are married, 42% speak English and 58% speak Spanish. 76% of Irwindale residents were born in California, 5% were born out of state, 0% were born outside of the United States and 19% were foreign born.