County ZIP codes · Virginia · FIPS 51107
Loudoun County, VA ZIP Codes
Loudoun County, Virginia has 38 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 20 residential and 18 for PO boxes or a single organization. 17 of the residential ones lie mainly in Loudoun County and 3 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $133,401 in 20166 (Sterling) to $233,494 in 20148 (Ashburn) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Loudoun County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $152,563 and $197,156.
They carry 16 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 20 residential ZIP codes in Loudoun County
17 ZIP codes lie mainly in Loudoun County; 3 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 20147 | Ashburn | 67,692 | 3,411 | $164k | $719k | 100% |
| 20148 | Ashburn | 64,021 | 3,301 | $234k | $874k | 100% |
| 20176 | Leesburg | 51,471 | 938 | $168k | $747k | 100% |
| 20164 | Sterling | 43,436 | 5,710 | $136k | $544k | 100% |
| 20105 | Aldie | 37,639 | 1,055 | $219k | $859k | 100% |
| 20152 | Chantilly | 36,674 | 2,752 | $197k | $766k | 100% |
| 20175 | Leesburg | 34,733 | 589 | $175k | $781k | 100% |
| 20165 | Sterling | 34,088 | 3,461 | $183k | $705k | 100% |
| 20132 | Purcellville | 19,817 | 234 | $182k | $776k | 100% |
| 20166 | Sterling | 14,949 | 550 | $133k | $619k | 100% |
| 20141 | Round Hill | 8,359 | 321 | $211k | $737k | 100% |
| 20180 | Lovettsville | 7,531 | 175 | $152k | $664k | 100% |
| 20158 | Hamilton | 4,979 | 376 | $212k | $766k | 100% |
| 20117 | Middleburg | 2,790 | 57 | $146k | $937k | 89% |
| 20197 | Waterford | 1,825 | 124 | $191k | $1.08M | 100% |
| 20184 | Upperville | 635 | 18 | $50k | – | 56% |
| 20129 | Paeonian Springs | 538 | 126 | $250k+ | $1.24M | 100% |
Partly in Loudoun County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
5 ZIP codes of Loudoun County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Loudoun | Elsewhere |
|---|---|---|
| 20120 | 10% | Fairfax County 90% |
| 20135 | 39% | Clarke County 61% |
| 20117 | 89% | Fauquier County 11% |
| 20184 | 56% | Fauquier County 44% |
| 20130 | 23% | Clarke County 54%; Fauquier County 23% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 20101 | Dulles |
| 20102 | Dulles |
| 20103 | Dulles |
| 20104 | Dulles |
| 20118 | Middleburg |
| 20131 | Philomont |
| 20134 | Purcellville |
| 20142 | Round Hill |
| 20146 | Ashburn |
| 20149 | Ashburn |
| 20159 | Hamilton |
| 20160 | Lincoln |
| 20163 | Sterling |
| 20167 | Sterling |
| 20177 | Leesburg |
| 20178 | Leesburg |
| 20189 | Dulles |
| 20598 | Dhs |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Loudoun County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Loudoun County's ZIP codes use 2 prefixes: 201 and 205.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.