About San Mateo County
San Mateo County is a mid-sized city located in United States, in the California region. According to the latest available data (2026), the population of San Mateo County is approximately 764,442 residents, making it the #88 most populous city in United States.
Globally, San Mateo County ranks #2,415 among the world's most populated cities.
San Mateo County City Statistics
| City | San Mateo County |
| Country |  United States |
| Population | 764,442 |
| Global Rank | #2,415 |
| Rank in United States | #88 of 867 cities |
| City Category | mid-sized city |
| Region | California |
| Latitude | 37.44 |
| Longitude | -122.36 |
| Data Year | 2026 |
Population Comparison
To put San Mateo County's population of 764,442 into perspective:
- San Mateo County has over 764,000 residents.
Where is San Mateo County Located?
San Mateo County is located in United States, in the California region, at coordinates 37.44° latitude and -122.36° longitude. San Mateo County sits in the subtropics, typically enjoying warm temperatures year-round.
Nearby Cities
Other Cities in United States
Largest Cities in United States
| # | City | Population |
|---|---|---|
| 1 | Harris County | 4,731,145 |
| 2 | Los Angeles | 3,898,747 |
| 3 | San Diego County | 3,298,634 |
| 4 | Brooklyn | 2,736,074 |
| 5 | Miami-Dade County | 2,701,767 |
Frequently Asked Questions
What is the population of San Mateo County?
The population of San Mateo County is approximately 764,442 residents according to the latest available data (2026).
Where is San Mateo County located?
San Mateo County is located in United States at approximately 37.44° latitude and -122.36° longitude.
Is San Mateo County one of the largest cities in United States?
With a population of 764,442, San Mateo County is one of the notable urban areas in United States. It ranks #88 out of 867 cities in the country.
