ZIP code 20833: Olney, MD
ZIP code 20833 is in Olney (61% of residents), Ashton-Sandy Spring (5.5%) and Brookeville (2.1%), in Montgomery County (98%) and Howard County (1.7%), Maryland. 32% of its residents live outside city limits. It is in Maryland's 8th congressional district (98%) and Maryland's 3rd congressional district (1.7%). Its state senate districts are State Senate District 14 (98%) and State Senate District 9 (1.7%); its state house districts are State Legislative District 14 (98%) and State Legislative Subdistrict 9A (1.7%).
See it on the mapAll of Maryland
City and county
| City or town | Share of ZIP residents |
|---|---|
| Olney | 61% |
| Ashton-Sandy Spring | 5.5% |
| Brookeville | 2.1% |
| County | Share of ZIP residents |
|---|---|
| Montgomery County | 98% |
| Howard County | 1.7% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| District 8 | 94% |
| District 1 | 3.9% |
| District 4, Lisbon | 1.7% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Maryland's 8th congressional district (MD-08) | 98% |
| Maryland's 3rd congressional district (MD-03) | 1.7% |
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 (MD-08) | Jamie Raskin (D) | 202-225-5341 | 98% |
| U.S. Representative (MD-03) | Sarah Elfreth (D) | 202-225-4016 | 1.7% |
| U.S. Senator | Angela D. Alsobrooks (D) | 202-224-4524 · contact form | statewide |
| U.S. Senator | Chris Van Hollen (D) | 202-224-4654 · contact form | statewide |
| State Senator (State Senate District 14) | Craig Zucker (Democratic) | 98% | |
| State Senator (State Senate District 9) | Katie Hester (Democratic) | 1.7% | |
| Delegate (State Legislative District 14) | Anne Kaiser (Democratic) | 98% | |
| Delegate (State Legislative District 14) | Bernice Mireku-North (Democratic) | 98% | |
| Delegate (State Legislative District 14) | Pam Queen (Democratic) | 98% | |
| Delegate (State Legislative Subdistrict 9A) | Chao Wu (Democratic) | 1.7% | |
| Delegate (State Legislative Subdistrict 9A) | Natalie Ziegler (Democratic) | 1.7% |
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
- Olney website: https://www.olneymd.org/
- Olney laws: search for the Olney, Maryland code of ordinances
- Ashton-Sandy Spring laws: search for the Ashton-Sandy Spring, Maryland code of ordinances
- Brookeville website: https://townofbrookevillemd.org/
- Brookeville laws: search for the Brookeville, Maryland code of ordinances
- Montgomery County website: https://www.montgomerycountymd.gov/
- Montgomery County laws: search for the Montgomery County, Maryland code of ordinances
- Howard County website: https://www.howardcountymd.gov/
- Howard County laws: search for the Howard County, Maryland code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 14 | 98% |
| State Senate District 9 | 1.7% |
| State house district | Share of ZIP residents |
|---|---|
| State Legislative District 14 | 98% |
| State Legislative Subdistrict 9A | 1.7% |
Voting precincts
9 voting precincts overlap ZIP 20833. 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:20833")
ZIP 20833 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.