Residential delivery area · Ohio
ZIP Code 45321: Eldorado, OH
ZIP code 45321 uses the postal name Eldorado, Ohio and lies entirely in Preble County (Census 2020 ZIP-county file). About 1,300 people live there (Census Bureau, ACS 2020-2024). Median household income is $69,135 (Census Bureau, ACS 2020-2024). By Census place, 2% of its land lies in Eldorado; 98% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2024
- ZBP2023
- IRS2022
- Town
- Eldorado · its only residential ZIP
- County
- Preble County
- Census places
- Eldorado
- House district
- OH-8 119th Congress
- State
- Ohio
- Time zone
- Eastern
- Land area
- 14.1 sq mi · 90 people per sq mi
Where is ZIP code 45321?
45321 centers on 39.865°, -84.687° and covers 14.1 square miles of land plus 0.0 of water. It borders 4 ZIP codes: 45347, 45382, 45320, 45346.
The map draws ZIP code areas only. For the streets inside 45321, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 45321 compare with the rest of Preble County?
| Measure | 45321 | In Preble County | In OH |
|---|---|---|---|
| People (ACS 2020-2024) | 1,272 | 10th of 15 | 887th of 1,233 |
| Median household income | $69k | 6th of 10 | 420th of 755 |
| Median home value | $151k | 9th of 10 | 640th of 810 |
Its median household income is higher than in 45% of U.S. residential ZIP codes, and it is denser than 52% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 45321?
The 2020 Census counted 859 people in 45321; the ACS, which samples households over 2020-2024, estimates 1,272. Between the 2010 and 2020 censuses its population fell 7.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 1,272±297 (90% margin)
- 2020 Census count
- 859−7.7% since 2010 (931)
- Households
- 424
- Median age
- 29.1
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 45321?
Of the 1,272 people the ACS estimates in 45321, 31.7% are under 18 and 12.5% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (96.8%).
- Under 1831.7%
- 18 to 6455.8%
- 65 and older12.5%
- White, not Hispanic96.8%
- Other or two or more2.8%
- Hispanic or Latino0.4%
- Black, not Hispanic0.0%
- Asian, not Hispanic0.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 45321 earn?
Median household income is $69,135 (ACS 2020-2024), the 6th highest of the 10 ranked ZIP codes in Preble County. It is not measurably different from 2015-2019 ($67,575 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $69,135
- Income per person
- $31,472
- Below the poverty line
- 11.5%
- Unemployed (of the labor force)
- 0.5%
- Adults 25+ with a bachelor's degree
- 14.3%
- Adjusted gross income per tax return, 2022
- $56,768440 returns; wages 72% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 45321?
- Median home value (owners' estimate)
- $150,900
- Median gross rent
- $1,012
- Homes owned by their occupants
- 88.4%
- Housing units
- 432
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 45321?
6 business establishments had a location in this ZIP code in 2023, 2 more than in 2018 (ZIP Code Business Patterns).
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 45321?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 45347 | New Paris | 4,095 | $63k | 4.3 mi |
| 45382 | West Manchester | 1,154 | $96k | 4.7 mi |
| 45320 | Eaton | 15,454 | $65k | 7.9 mi |
| 45346 | New Madison | 1,663 | $77k | 8.2 mi |
| 45338 | Lewisburg | 4,761 | $75k | 7.6 mi (near) |
| 45332 | Hollansburg | 716 | $77k | 10.5 mi (near) |
| 45378 | Verona | 539 | $73k | 10.9 mi (near) |
| 47374 | Richmond, IN | 44,615 | $51k | 11.0 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.