Boundary Atlas

ZIP code 18655: Union, PA

ZIP code 18655 is in Shickshinny (11% of residents), Mocanaqua (8.8%) and Jonestown (1.1%), in Luzerne County (94%) and Columbia County (6.0%), Pennsylvania. 79% of its residents live outside city limits. It is in Pennsylvania's 9th congressional district. Its state senate districts are State Senate District 27 (56%) and State Senate District 20 (44%); its state house districts are State House District 117 (94%) and State House District 109 (6.0%).

5,881residents (2020 Census)
71.4 sq miland area
4cities and towns
1congressional district
11voting precincts

See it on the mapAll of Pennsylvania

City and county

City or townShare of ZIP residents
Shickshinny11%
Mocanaqua8.8%
Jonestown1.1%
New Columbus0.1%

CountyShare of ZIP residents
Luzerne County94%
Columbia County6.0%

Town or county subdivisionShare of ZIP residents
Union township29%
Huntington township24%
Shickshinny borough11%
Conyngham township8.9%
Ross township8.7%
Salem township5.8%
Hunlock township4.7%
Briar Creek township3.3%
Fishing Creek township2.6%
Fairmount township2.3%
New Columbus borough0.1%

Congressional district

Congressional districtShare of ZIP residents
Pennsylvania's 9th congressional district (PA-09)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 2756%
State Senate District 2044%

State house districtShare of ZIP residents
State House District 11794%
State House District 1096.0%

Voting precincts

11 voting precincts overlap ZIP 18655. 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:18655")

ZIP 18655 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.