ZIP Code 61540

61540 is one of Illinois's ZIP codes, delivering to addresses in Lacon, Marshall County.

City: Lacon
County: Marshall County
State: Illinois
Prefix: 615xx

Where this code sits

61540 is part of the 615xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Lacon.

Lacon Illinois ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 61540 delivers to without sharing its boundary.

ZIP codes nearest 61540

The ZIP codes whose reference points sit closest to 61540.
ZIP code	Distance	Delivers to
ZIP code 61565	3.0 mi	Sparland, IL
ZIP code 61537	6.4 mi	Henry, IL
ZIP code 61375	8.0 mi	Varna, IL
ZIP code 61541	9.0 mi	La Rose, IL
ZIP code 61570	9.6 mi	Washburn, IL
ZIP code 61545	10 mi	Lowpoint, IL
ZIP code 61523	10 mi	Chillicothe, IL
ZIP code 61526	11 mi	Edelstein, IL

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 61540, plotted from its record coordinates.

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

Scope ZIP code 61540. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.