Eldorado is a village in Preble County, Ohio, home to about 841 people across 0.2 square miles. Its ZIP code is 45321.
Homes sold for a median of $87 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Eldorado. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Cincinnati Northern Kentucky International Airport (CVG)58 miles away |
|---|---|
| Closer regional airport | James M. Cox Dayton International Airport (DAY)24 miles away |
| Nearest city of 250,000+ | Cincinnati, OH52 miles away |
| Nearest city of 1 million+ | Chicago, IL207 miles away |
Straight-line distances from the center of Eldorado; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Eldorado had 458 residents in the 2020 census, down 16% since 2000.
It’s the 724th largest of 1,264 towns in Ohio by population.
Preble County grew from 23,713 residents in 1900 to 40,999 in 2020.
Preble County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 20°F. About 42.9 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Richmond Wtr Wks, IN weather station (11 miles away).
10,532 jobs at 671 businesses in Preble County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2022 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.