Redwood City, CA has a population of 82,595 and is the 417th largest city in the United States. The population density is 4,280 per sq mi which is 1742% higher than the California average and 4624% higher than the national average. The median age in Redwood City is 37 which is approximately 3% higher than the California average of 36. In Redwood City, 55% of the population over 15 years of age are married, 53% speak English and 32% speak Spanish. 50% of Redwood City residents were born in California, 16% were born out of state, 1% were born outside of the United States and 33% were foreign born.