Suisun City, CA has a population of 29,045 and is the 1,475th largest city in the United States. The population density is 7,075 per sq mi which is 2944% higher than the California average and 7709% higher than the national average. The median age in Suisun City is 33 which is approximately 8% lower than the California average of 36. In Suisun City, 51% of the population over 15 years of age are married, 69% speak English and 13% speak Spanish. 59% of Suisun City residents were born in California, 16% were born out of state, 2% were born outside of the United States and 23% were foreign born.