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Zip Code 45321 — Eldorado, OH

45321 is a ZIP Code associated with Eldorado, OH, located within Preble. The postal region supports an estimated population of 1,272 residents across Data Pending housing units, with a population density of 34.8 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.871340, -84.677750)

Data Metric	Local Statistic
Postal / Zip Code	45321
Primary City	Eldorado
State / Province	OH
County	Preble
Total Population	1,272
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	34.8 people/sq mi
Timezone	America/New_York

How 45321 Compares

Metric	ZIP 45321	Preble County	OH State Average
Population	1,272	40,293	11,810,293
Median Income	Data Pending	N/A	N/A
Population Density	34.8 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 45382	West Manchester	3.7 mi	1,154	N/A
Zip 45347	New Paris	4.6 mi	4,095	N/A
Zip 45338	Lewisburg	7.2 mi	4,761	N/A
Zip 45346	New Madison	7.6 mi	1,663	N/A
Zip 45320	Eaton	8.6 mi	15,454	N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →