San Carlos is a city located in San Mateo County California. With a 2020 population of 29,893, it is the 240th largest city in California and the 1291st largest city in the United States . San Carlos is currently declining at a rate of -0.49% annually but its population has increased by 5.23% since the most recent census, which recorded a population of 28,406 in 2010. San Carlos reached it's highest population of 30,393 in 2017. Spanning over 6 miles, San Carlos has a population density of 5,422 people per square mile.
The average household income in San Carlos is $239,376 with a poverty rate of 3.02%. The median rental costs in recent years comes to $2,321 per month, and the median house value is $1.63 Mn. The median age in San Carlos is 41.8 years, 40.5 years for males, and 43.2 years for females.