ZIP code 07821: Byram, NJ
ZIP code 07821 is in Hopatcong (9.5% of residents), Lake Mohawk (7.2%), Andover (6.5%) and Johnsonburg (2.0%), in Sussex County (92%) and Warren County (8.1%), New Jersey. 75% of its residents live outside city limits. It is in New Jersey's 7th congressional district (94%) and New Jersey's 5th congressional district (6.3%). Its state senate districts are State Senate District 24 (95%) and State Senate District 23 (4.7%); its state house districts are Assembly District 24 (95%) and Assembly District 23 (4.7%).
See it on the mapAll of New Jersey
City and county
| City or town | Share of ZIP residents |
|---|---|
| Hopatcong | 9.5% |
| Lake Mohawk | 7.2% |
| Andover | 6.5% |
| Johnsonburg | 2.0% |
| County | Share of ZIP residents |
|---|---|
| Sussex County | 92% |
| Warren County | 8.1% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Byram township | 40% |
| Green township | 29% |
| Hopatcong borough | 9.5% |
| Andover borough | 6.5% |
| Andover township | 6.3% |
| Frelinghuysen township | 4.7% |
| Allamuchy township | 3.4% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| New Jersey's 7th congressional district (NJ-07) | 94% |
| New Jersey's 5th congressional district (NJ-05) | 6.3% |
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 (NJ-07) | Thomas H. Kean, Jr. (R) | 202-225-5361 | 94% |
| U.S. Representative (NJ-05) | Josh Gottheimer (D) | 202-225-4465 | 6.3% |
| U.S. Senator | Andy Kim (D) | 202-224-4744 | statewide |
| U.S. Senator | Cory A. Booker (D) | 202-224-3224 · contact form | statewide |
| State Senator (State Senate District 24) | Parker Space (R) | 973-300-0200 | 95% |
| State Senator (State Senate District 23) | Doug Steinhardt (R) | 908-835-0552 | 4.7% |
| Assembly Member (Assembly District 24) | Dawn Fantasia (R) | 908-955-7429 | 95% |
| Assembly Member (Assembly District 24) | Mike Inganamort (R) | 908-955-7429 | 95% |
| Assembly Member (Assembly District 23) | Erik Peterson (R) | 908-238-0251 | 4.7% |
| Assembly Member (Assembly District 23) | John DiMaio (R) | 908-684-9550 | 4.7% |
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
- Hopatcong website: https://hopatcong.org/
- Hopatcong laws: search for the Hopatcong, New Jersey code of ordinances
- Lake Mohawk laws: search for the Lake Mohawk, New Jersey code of ordinances
- Andover website: http://www.andoverboroughnj.org/
- Andover laws: search for the Andover, New Jersey code of ordinances
- Sussex County website: https://www.sussex.nj.us/
- Sussex County laws: search for the Sussex County, New Jersey code of ordinances
- Warren County laws: search for the Warren County, New Jersey code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 24 | 95% |
| State Senate District 23 | 4.7% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 24 | 95% |
| Assembly District 23 | 4.7% |
Voting precincts
16 voting precincts overlap ZIP 07821. 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:07821")
ZIP 07821 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.