Fort Washington, CA has a population of 737 and is the 17,146th largest city in the United States. The population density is 5,944 per sq mi which is 2222% higher than the California average and 6460% higher than the national average. The median age in Fort Washington is 21 which is approximately 42% lower than the California average of 36. In Fort Washington, 82% of the population over 15 years of age are married, 87% speak English and 0% speak Spanish. 43% of Fort Washington residents were born in California, 45% were born out of state, 0% were born outside of the United States and 12% were foreign born.