Pleasant Hill, CA has a population of 34,395 and is the 1,225th largest city in the United States. The population density is 4,861 per sq mi which is 1992% higher than the California average and 5265% higher than the national average. The median age in Pleasant Hill is 40 which is approximately 12% higher than the California average of 36. In Pleasant Hill, 55% of the population over 15 years of age are married, 78% speak English and 7% speak Spanish. 60% of Pleasant Hill residents were born in California, 21% were born out of state, 2% were born outside of the United States and 17% were foreign born.