About Contra Costa County
Contra Costa County is a large city located in United States, in the California region. According to the latest available data (2026), the population of Contra Costa County is approximately 1,165,927 residents, making it the #43 most populous city in United States.
Globally, Contra Costa County ranks #1,512 among the world's most populated cities. With over 1 million residents, Contra Costa County plays an important role as an economic and cultural center in United States.
Contra Costa County City Statistics
| City | Contra Costa County |
| Country |  United States |
| Population | 1,165,927 |
| Global Rank | #1,512 |
| Rank in United States | #43 of 867 cities |
| City Category | large city |
| Region | California |
| Latitude | 37.93 |
| Longitude | -121.95 |
| Data Year | 2026 |
Population Comparison
To put Contra Costa County's population of 1,165,927 into perspective:
- Contra Costa County has approximately 1.2 million residents.
- This makes it comparable in size to cities like Prague or Munich.
Where is Contra Costa County Located?
Contra Costa County is located in United States, in the California region, at coordinates 37.93° latitude and -121.95° longitude. Contra Costa 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 Contra Costa County?
The population of Contra Costa County is approximately 1,165,927 residents according to the latest available data (2026).
Where is Contra Costa County located?
Contra Costa County is located in United States at approximately 37.93° latitude and -121.95° longitude.
Is Contra Costa County one of the largest cities in United States?
With a population of 1,165,927, Contra Costa County is one of the major urban areas in United States. It ranks #43 out of 867 cities in the country.
