Napa, CA has a population of 79,567 and is the 434th largest city in the United States. The population density is 4,433 per sq mi which is 1808% higher than the California average and 4793% higher than the national average. The median age in Napa is 38 which is approximately 6% higher than the California average of 36. In Napa, 57% of the population over 15 years of age are married, 63% speak English and 33% speak Spanish. 58% of Napa residents were born in California, 18% were born out of state, 1% were born outside of the United States and 23% were foreign born.