About St. Charles County
St. Charles County is a city located in United States, in the Missouri region. According to the latest available data (2026), the population of St. Charles County is approximately 405,262 residents, making it the #187 most populous city in United States.
Globally, St. Charles County ranks #4,561 among the world's most populated cities.
St. Charles County City Statistics
| City | St. Charles County |
| Country |  United States |
| Population | 405,262 |
| Global Rank | #4,561 |
| Rank in United States | #187 of 867 cities |
| City Category | city |
| Region | Missouri |
| Latitude | 38.76 |
| Longitude | -90.6167 |
| Data Year | 2026 |
Where is St. Charles County Located?
St. Charles County is located in United States, in the Missouri region, at coordinates 38.76° latitude and -90.6167° longitude. St. Charles 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 St. Charles County?
The population of St. Charles County is approximately 405,262 residents according to the latest available data (2026).
Where is St. Charles County located?
St. Charles County is located in United States at approximately 38.76° latitude and -90.6167° longitude.
Is St. Charles County one of the largest cities in United States?
With a population of 405,262, St. Charles County is one of the notable urban areas in United States. It ranks #187 out of 867 cities in the country.
