ZIP Code 45321

45321 is one of Ohio's ZIP codes, delivering to addresses in Eldorado, Preble County.

City: Eldorado
County: Preble County
State: Ohio
Prefix: 453xx

Where this code sits

45321 is part of the 453xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Eldorado.

Eldorado Ohio ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 45321 delivers to without sharing its boundary.

ZIP codes nearest 45321

The ZIP codes whose reference points sit closest to 45321.
ZIP code	Distance	Delivers to
ZIP code 45382	3.3 mi	West Manchester, OH
ZIP code 45347	5.6 mi	New Paris, OH
ZIP code 45346	6.0 mi	New Madison, OH
ZIP code 45338	7.9 mi	Lewisburg, OH
ZIP code 45332	9.2 mi	Hollansburg, OH
ZIP code 45378	10 mi	Verona, OH
ZIP code 45320	10 mi	Eaton, OH
ZIP code 45304	11 mi	Arcanum, OH

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 45321, plotted from its record coordinates.

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

Scope ZIP code 45321. 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.