Isleton, CA has a population of 787 and is the 16,725th largest city in the United States. The population density is 1,790 per sq mi which is 670% higher than the California average and 1876% higher than the national average. The median age in Isleton is 42 which is approximately 17% higher than the California average of 36. In Isleton, 46% of the population over 15 years of age are married, 59% speak English and 37% speak Spanish. 67% of Isleton residents were born in California, 9% were born out of state, 1% were born outside of the United States and 24% were foreign born.