About Loudoun County
Loudoun County is a city located in United States, in the Virginia region. According to the latest available data (2026), the population of Loudoun County is approximately 420,959 residents, making it the #181 most populous city in United States.
Globally, Loudoun County ranks #4,400 among the world's most populated cities.
Loudoun County City Statistics
| City | Loudoun County |
| Country |  United States |
| Population | 420,959 |
| Global Rank | #4,400 |
| Rank in United States | #181 of 867 cities |
| City Category | city |
| Region | Virginia |
| Latitude | 39.09 |
| Longitude | -77.64 |
| Data Year | 2026 |
Where is Loudoun County Located?
Loudoun County is located in United States, in the Virginia region, at coordinates 39.09° latitude and -77.64° longitude. Loudoun 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 Loudoun County?
The population of Loudoun County is approximately 420,959 residents according to the latest available data (2026).
Where is Loudoun County located?
Loudoun County is located in United States at approximately 39.09° latitude and -77.64° longitude.
Is Loudoun County one of the largest cities in United States?
With a population of 420,959, Loudoun County is one of the notable urban areas in United States. It ranks #181 out of 867 cities in the country.
