ZIP code 20121: Centreville, VA
ZIP code 20121 is in Centreville (96% of residents) and Bull Run (3.5%), in Fairfax County, Virginia. It is in Virginia's 11th congressional district (96%) and Virginia's 10th congressional district (3.6%). Its state senate district is State Senate District 36; its state house districts are House of Delegates District 10 (90%) and House of Delegates District 9 (9.9%).
See it on the mapAll of Virginia
City and county
| City or town | Share of ZIP residents |
|---|---|
| Centreville | 96% |
| Bull Run | 3.5% |
| County | Share of ZIP residents |
|---|---|
| Fairfax County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Sully district | 96% |
| Springfield district | 4.5% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Virginia's 11th congressional district (VA-11) | 96% |
| Virginia's 10th congressional district (VA-10) | 3.6% |
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 | 96% |
| U.S. Representative (VA-10) | Suhas Subramanyam (D) | 202-225-5136 | 3.6% |
| 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) | 100% | |
| Delegate (State House District 10) | Dan Helmer (Democratic) | 90% | |
| Delegate (State House District 9) | Karrie Delaney (Democratic) | 9.9% |
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
- Bull Run laws: search for the Bull Run, 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 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| House of Delegates District 10 | 90% |
| House of Delegates District 9 | 9.9% |
Voting precincts
10 voting precincts overlap ZIP 20121. 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://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:20121")
ZIP 20121 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.