About Boulder County
Boulder County is a city located in United States, in the Colorado region. According to the latest available data (2026), the population of Boulder County is approximately 330,758 residents, making it the #229 most populous city in United States.
Globally, Boulder County ranks #5,577 among the world's most populated cities.
Boulder County City Statistics
| City | Boulder County |
| Country |  United States |
| Population | 330,758 |
| Global Rank | #5,577 |
| Rank in United States | #229 of 867 cities |
| City Category | city |
| Region | Colorado |
| Latitude | 40.09 |
| Longitude | -105.36 |
| Data Year | 2026 |
Where is Boulder County Located?
Boulder County is located in United States, in the Colorado region, at coordinates 40.09° latitude and -105.36° longitude. Located in the mid-latitudes, Boulder County experiences distinct four-season weather patterns.
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 Boulder County?
The population of Boulder County is approximately 330,758 residents according to the latest available data (2026).
Where is Boulder County located?
Boulder County is located in United States at approximately 40.09° latitude and -105.36° longitude.
Is Boulder County one of the largest cities in United States?
With a population of 330,758, Boulder County is one of the notable urban areas in United States. It ranks #229 out of 867 cities in the country.
