LaSalle County ZIP Codes

LaSalle County is a county of Illinois.

ZIP codes: 24
Cities & towns: 24
Area codes: 2
Land area: 1,135 sq mi

Every ZIP code in LaSalle County

604xx–613xx

The complete list of LaSalle County, IL ZIP codes with the city each one delivers to.
ZIP code	City
60470	Ransom
60518	Earlville
60531	Leland
60549	Serena
60551	Sheridan
60557	Wedron
61301	La Salle
61316	Cedar Point
61321	Dana
61325	Grand Ridge
61332	Leonore
61334	Lostant
61341	Marseilles
61342	Mendota
61348	Oglesby
61350	Ottawa
61354	Peru
61358	Rutland
61360	Seneca
61364	Streator
61370	Tonica
61371	Triumph
61372	Troy Grove
61373	Utica

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the LaSalle County codes above are listed without a column we would have to invent.

Cities and towns in LaSalle County

A further 5 places in LaSalle County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.

Area codes covering LaSalle County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

Where LaSalle County's ZIP codes sit

Each point is the reference point of one LaSalle County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope every ZIP code recorded in LaSalle County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.