ZIP code 21921 is in Elkton (35% of residents) and North East (1.2%), in Cecil County, Maryland. 63% of its residents live outside city limits. It is in Maryland's 1st congressional district. Its state senate districts are State Senate District 36 (92%) and State Senate District 35 (8.0%); its state house districts are State Legislative District 36 (92%) and State Legislative Subdistrict 35B (8.0%).
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).
16 voting precincts overlap ZIP 21921.
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:21921")
ZIP 21921 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.