ZIP code · Eldorado · Ohio · United States
ZIP code 45321 — Eldorado
ZIP code 45321 serves Eldorado, Ohio.
- Postal code
- 45321Single source Value from one source, not cross-checked.
- City
- Eldorado
- County
- Preble FIPS 39135
- State
- Ohio
- Country
- United States
- Coordinates
- 39.8882, -84.6786 — precision precise (locality)
View on OpenStreetMap - Population
- 1,254 (ZCTA, ACS 5-year)
- Population density
- 89 / sq mi
- Land area
- 14.1 sq mi (36.6 km²) (ZCTA, ACS 5-year)
- Median household income
- $67,153
- Per-capita income
- $31,755
- Median age
- 29
- Households
- 457
- Housing units
- 457
- Median home value
- $129,200
- Median gross rent
- $983 / month
- Congressional district
- OH-8 (119th Congress)
- USDA hardiness zone
- 6a (-10 to -5 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
- Area code
- 937Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 45321 with another ZIP · ZIPs within 25 miles · distance from 45321
Map of ZIP code 45321
Climate — monthly normals
Warmest month Jul (avg high 85°F), coldest Jan (avg low 20°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 36 | 40 | 51 | 64 | 74 | 82 | 85 | 84 | 78 | 66 | 52 | 40 |
| Avg low °F | 20 | 22 | 31 | 41 | 52 | 60 | 64 | 62 | 54 | 43 | 33 | 25 |
| Precip in | 3.2 | 2.3 | 3.4 | 4.3 | 4.6 | 4.8 | 4.3 | 3.3 | 3.1 | 3.2 | 3.3 | 3.1 |
NOAA 1991–2020 climate normals from the nearest station: RICHMOND WTR WKS (10.8 mi) · NOAA NCEI
Places in ZIP 45321
- 1 parks
- 1 playgrounds
- 1 post offices
- 2 places of worship
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page