Loudoun County, Virginia

17 ZIP codes · 515.74 sq mi of land · FIPS 51107

Population	432,998
State	Virginia
FIPS code	51107
Time zone	Eastern
Land area	515.74 sq mi
Center (lat, long)	39.0812, -77.6389

Area codes in this area

540 571 703 826

These are the area codes that most often serve Loudoun County (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Cities and towns (largest first)

Leesburg · 49,171 Ashburn · 46,026 Sterling · 32,411 Chantilly · 24,036AldieMiddleburgPaeonian SpringsPurcellvilleRound HillHamiltonLovettsvilleUppervilleWaterford

ZIP codes in Loudoun County

20105 Aldie 20117 Middleburg 20129 Paeonian Springs 20132 Purcellville 20141 Round Hill 20147 Ashburn 20148 Ashburn 20152 Chantilly 20158 Hamilton 20164 Sterling 20165 Sterling 20166 Sterling 20175 Leesburg 20176 Leesburg 20180 Lovettsville 20184 Upperville 20197 Waterford

Population: U.S. Census Bureau, ACS 5-year estimates, 2024.