Campbell, CA has a population of 40,788 and is the 1,010th largest city in the United States. The population density is 6,953 per sq mi which is 2892% higher than the California average and 7574% higher than the national average. The median age in Campbell is 39 which is approximately 7% higher than the California average of 36. In Campbell, 53% of the population over 15 years of age are married, 69% speak English and 11% speak Spanish. 55% of Campbell residents were born in California, 20% were born out of state, 1% were born outside of the United States and 24% were foreign born.