Humboldt Hill, CA has a population of 3,710 and is the 7,785th largest city in the United States. The population density is 893 per sq mi which is 284% higher than the California average and 886% higher than the national average. The median age in Humboldt Hill is 37 which is approximately 4% higher than the California average of 36. In Humboldt Hill, 49% of the population over 15 years of age are married, 84% speak English and 10% speak Spanish. 72% of Humboldt Hill residents were born in California, 18% were born out of state, 1% were born outside of the United States and 9% were foreign born.