ZIP code 11787 is in Smithtown (66% of residents), Hauppauge (11%), Nesconset (7.2%), Commack (5.6%), St. James (5.5%) and Village of the Branch (4.9%), in Suffolk County, New York. It is in New York's 1st congressional district. Its state senate district is State Senate District 2; its state house district is Assembly District 8.
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).
36 voting precincts overlap ZIP 11787.
Map them, with each precinct's share of the ZIP's residents.
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ZIP 11787 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.