A bill to require the United States Postal Service to designate ZIP Codes for certain communities.

S. 4505 would require the U.S. Postal Service to assign a single, unique ZIP Code to each of 75 named communities across 17 states, including places in California, Colorado, Florida, Indiana, Texas, and others. The Postal Service would have one year from the bill's enactment to complete these designations. Many of the listed communities currently share ZIP Codes with neighboring towns or areas, which the bill treats as a problem to be corrected by giving each one its own distinct code.

The bill directly affects residents, businesses, and local governments in the 75 specified communities, who would gain a ZIP Code unique to their community rather than one shared with, or subsumed under, a nearby city. It does not appear to affect ZIP Codes or postal service elsewhere in the country.

The bill was introduced on May 12, 2026, by Senator Joni Ernst (R-IA) with several cosponsors, and was referred to the Senate Committee on Homeland Security and Governmental Affairs. As of its latest action on August 6, 2026, the committee ordered the bill reported favorably with an amendment in the nature of a substitute, meaning it has cleared committee (in amended form) and is now positioned for possible consideration by the full Senate. It would still need to pass the Senate, pass the House, and be signed by the President to become law.

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