San Mateo County is found in the state of California. With an area of 741 square miles, San Mateo County is one of the smallest counties in the state, while in population it is near the top with 70,716 inhabitants. San Mateo County's population density of urban makes it one of the least mostly populated areas in the state. The county's largest city is San Mateo, with a population of 125,642.
San Mateo County is one of the most affluent regions in the state. The median income for San Mateo County residents is $75,521, putting the region in at the top of all counties in California. Reflecting this, the average house price in San Mateo County is $505,597, well above the state average of $244,863.
Continued below...