What is Loudoun County's population and size?
Based on the 2010 U.S. Census, Loudoun County's population is 312,311. The 2012 estimate is 328,533. More detailed, up-to-date demographic information is online here .

As for size, Loudoun County covers 520 square miles.

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1. What is Loudoun County's population and size?
2. How do I submit a request for service or report a concern to the county government?
3. How do I file a Freedom of Information Act (FOIA) request with the county?
4. How do I get in touch with a specific county department or office?