ZIP code 20124: Centreville, VA
ZIP code 20124 is in Centreville (58% of residents), Union Mill (22%) and Clifton (1.6%), in Fairfax County, Virginia. 18% of its residents live outside city limits. It is in Virginia's 11th congressional district (59%) and Virginia's 10th congressional district (41%). Its state senate districts are State Senate District 36 (99%) and State Senate District 33 (0.9%); its state house districts are House of Delegates District 10 (99%) and House of Delegates District 15 (0.9%).
See it on the mapAll of Virginia
City and county
| City or town | Share of ZIP residents |
|---|---|
| Centreville | 58% |
| Union Mill | 22% |
| Clifton | 1.6% |
| County | Share of ZIP residents |
|---|---|
| Fairfax County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Springfield district | 85% |
| Sully district | 15% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Virginia's 11th congressional district (VA-11) | 59% |
| Virginia's 10th congressional district (VA-10) | 41% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (VA-11) | James R. Walkinshaw (D) | 202-225-1492 | 59% |
| U.S. Representative (VA-10) | Suhas Subramanyam (D) | 202-225-5136 | 41% |
| U.S. Senator | Mark R. Warner (D) | 202-224-2023 · contact form | statewide |
| U.S. Senator | Tim Kaine (D) | 202-224-4024 · contact form | statewide |
| State Senator (State Senate District 36) | Stella Pekarsky (Democratic) | 99% | |
| State Senator (State Senate District 33) | Jennifer Carroll Foy (Democratic) | 0.9% | |
| Delegate (State House District 10) | Dan Helmer (Democratic) | 99% | |
| Delegate (State House District 15) | Laura Jane Cohen (Democratic) | 0.9% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Centreville laws: search for the Centreville, Virginia code of ordinances
- Union Mill laws: search for the Union Mill, Virginia code of ordinances
- Clifton website: http://cliftonva.us/
- Clifton laws: search for the Clifton, Virginia code of ordinances
- Fairfax County website: https://www.fairfaxcounty.gov/
- Fairfax County laws: search for the Fairfax County, Virginia code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 36 | 99% |
| State Senate District 33 | 0.9% |
| State house district | Share of ZIP residents |
|---|---|
| House of Delegates District 10 | 99% |
| House of Delegates District 15 | 0.9% |
Voting precincts
9 voting precincts overlap ZIP 20124. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:20124")
ZIP 20124 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.