ZIP code 48601 is in Saginaw (48% of residents), Buena Vista (18%), Bridgeport (15%) and Robin Glen-Indiantown (2.1%), in Saginaw County, Michigan. 16% of its residents live outside city limits. It is in Michigan's 8th congressional district. Its state senate districts are State Senate District 35 (72%) and State Senate District 26 (28%); its state house districts are State House District 94 (87%), State House District 97 (9.3%) and State House District 93 (3.6%).
18 voting precincts overlap ZIP 48601.
Map them, with each precinct's share of the ZIP's residents.
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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:48601")
ZIP 48601 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.