45321 ZIP Code — Eldorado, OH

Preble County, Ohio

ZIP code 45321 is located in Eldorado, Ohio, within Preble County. It covers approximately 14.12 square miles and serves a population of 1,235 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 326/937/513.

About ZIP code 45321

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $126,000. Owner-occupancy is high at 84%, well above the national average.

Median household income is $63,659. 35% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with manufacturing as the leading industry. The average commute of 30 minutes is near the national average.

College attainment at 18% is below the national average, consistent with a trades and production-oriented local economy.

Health indicators show elevated rates of smoking (26%) compared to national benchmarks.

Notable community characteristics include a notable veteran presence at 12% of civilians, above the national average of 7%.

Overall, ZIP code 45321 reflects a community defined by a trades-oriented workforce, a strong veteran community, high homeownership, and a significant Social Security-dependent population.

1,235
population
14.12
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
45321 ZIP code map
Cities in ZIP code 45321

Below are the cities the US Postal Service accepts for ZIP code 45321. Using any city not on this list may result in mail delivery delays.

City Status
Eldorado Preferred
Nearby ZIP codes
45382 West Manchester (3.6 mi) 45347 New Paris (4.8 mi) 45338 Lewisburg (5.7 mi) 45346 New Madison (7.8 mi) 45320 Eaton (9.1 mi) 45304 Arcanum (10.5 mi) 45332 Hollansburg (10.8 mi) 45381 West Alexandria (12.4 mi) 47374 Richmond (12.7 mi) 45309 Brookville (13.7 mi) 47341 Fountain City (13.8 mi) 47392 Webster (14.2 mi)
Demographics updated 05/2026
Population
Total population 1,235
Population density 87 / sq mi
State FIPS 39
County FIPS 135
Geography
Land area 14.12 sq mi
Water area 0.01 sq mi
Latitude 39.8724
Longitude -84.6664
Timezone Eastern (ET)
Area code 326/937/513
Total population by age
Gender
Race & ethnicity
Economics updated 05/2026
Household income
Income range This ZIP County avg State avg
Under $50k 37.7% 40.4% 43.3%
$50k – $100k 52.5% 38.2% 31.4%
$100k – $200k 9.9% 19.0% 20.0%
Over $200k 0.0% 2.4% 5.2%

Demographics & statistics

1,235
Population
87
People per sq mi
29.8
Median age
$63,659
Median household income
$29,031
Per capita income
$126,000
Median home value
$978
Median monthly rent
83.8%
Home ownership
10.0%
Poverty rate
6.1%
Unemployment
410
Housing units
17.6%
Bachelor's or higher

Age distribution

Male Female
68
Under 5
69
51
5–9
52
22
10–14
23
46
15–19
47
38
20–24
39
119
25–34
121
59
35–44
61
50
45–54
51
16
55–59
17
32
60–64
33
48
65–74
50
21
75–84
21
40
85+
41
← Male
Female →

Age summary

GroupCount%
Under 1834427.9%
18 and over89172.1%
65 and over22117.9%
Median age29.8 years

Race & ethnicity

White 97%
Two or more races 2.5%
Black or African American 0.5%
GroupCount%
White1,19897%
Two or more races312.5%
Black or African American60.5%

Household income

Income range This ZIP County avg State avg
Under $50k 37.7% 40.4% 43.3%
$50k – $100k 52.5% 38.2% 31.4%
$100k – $200k 9.9% 19.0% 20.0%
Over $200k 0.0% 2.4% 5.2%
$10k–$15k 3.0%
$15k–$25k 8.4%
$25k–$35k 8.4%
$35k–$50k 17.7%
$50k–$75k 31.4%
$75k–$100k 15.2%
$100k–$150k 9.5%
$150k–$200k 1.7%
$200k+ 4.6%
Range% of households
$10k–$15k3.0%
$15k–$25k8.4%
$25k–$35k8.4%
$35k–$50k17.7%
$50k–$75k31.4%
$75k–$100k15.2%
$100k–$150k9.5%
$150k–$200k1.7%
$200k+4.6%
Median income$63,659

Housing

Home values

Under $50k 6.0%
$50k–$100k 29.0%
$100k–$150k 24.2%
$150k–$200k 24.4%
$200k–$300k 6.8%
$300k–$500k 3.5%
$500k–$1M 6.0%

Housing overview

MetricValue
Median home value$126,000
Median rent / month$978
Owner occupied83.8%
Renter occupied16.2%
Vacant2.7%
Single-family detached98.2%
Large apartment buildings0.0%
Mobile homes0.0%
Median rooms6.3
Avg household size (owned)2.60

Year built

Era%
2020 or later0.0%
2010–20192.5%
2000–20090.4%
1990–19994.9%
1980–19893.5%
1970–19795.3%
1960–19697.0%
1950–19598.0%
1940–19497.4%
1939 or earlier61.0%

Bedrooms

Size% of units
No bedroom (studio)0.0%
1 bedroom1.2%
2 bedrooms20.1%
3 bedrooms67.6%
4 bedrooms11.1%
5+ bedrooms0.0%

Vehicles per household

Vehicles% of households
No vehicle3.2%
1 vehicle23.6%
2 vehicles44.3%
3 or more28.9%

Heating fuel

Fuel type%
Utility gas59.5%
Electricity17.1%
Propane / LP gas18.6%
Wood0.8%
Solar0.8%

Households & families

Household typeCount%
Married-couple family28059.1%
Cohabiting couple214.4%
Male householder, no spouse7315.4%
Female householder, no spouse10021.1%
Households with children under 1818639.2%
Households with seniors (65+)16134.0%
Average household size2.61

Marital status

StatusMaleFemale
Never married14.6%23.6%
Married68.7%53.5%
Separated0.5%1.9%
Widowed8.2%7.6%
Divorced8.0%13.3%

Education

Less than 9th grade 3.3%
Some HS, no diploma 8.1%
HS graduate 49.1%
Some college, no degree 12.1%
Associate's degree 9.9%
Bachelor's degree 12.4%
Graduate / professional 5.1%
Metric%
HS diploma or higher88.6%
Bachelor's or higher17.6%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool00.0%
Kindergarten103.9%
Elementary school13652.9%
High school6726.1%
College / grad school4417.1%

Employment

Industry of employment

Manufacturing 24.0%
Education & healthcare 23.1%
Construction 11.6%
Arts, food & hospitality 10.9%
Retail trade 7.2%
Agriculture & mining 6.5%
Professional & management 5.7%
Transportation & utilities 5.0%
Other services 3.0%
Information 1.5%
Finance & real estate 0.7%
Public administration 0.6%
Wholesale trade 0.4%

Occupation

Category%
Management, business & arts37.3%
Service10.9%
Sales & office10.9%
Natural resources & construction14.9%
Production & transportation26.0%

Employment type

Type%
Private sector83.6%
Government5.4%
Self-employed9.8%
Unpaid family workers1.3%

Commute

Method%
Drive alone83.7%
Carpool12.8%
Public transit0.0%
Walk0.0%
Work from home3.5%
Other means0.0%
Avg commute (minutes)30.3

Poverty

All people 10.0%
Under 18 years 13.4%
18 and over 8.6%
Married-couple families 7.1%
Female-led households 0.0%

Income support

Source% of households
Social Security35.0%
Retirement income24.1%
Supplemental Security5.1%
Cash public assistance0.0%
Food stamps / SNAP2.1%

Health indicators

Condition%
Obesity39.6%
High blood pressure33.7%
High cholesterol32.4%
Diabetes11.6%
Heart disease7.2%
Stroke3.3%
Asthma10.2%
Arthritis28.7%
Kidney disease2.9%
Pulmonary disease9.5%
Cancer6.6%
Behavior / access%
Smoking25.6%
Binge drinking17.3%
No physical activity28.4%
Less than 7 hrs sleep37.1%
Depression24.7%
Fair or poor health16.1%
Poor mental health17.1%
Poor physical health11.5%
No health insurance12.5%
Visited doctor (checkup)75.4%
Visited dentist61.9%
Cholesterol screening87.6%
Teeth loss16.6%

Veterans & disability

VeteransCount%
Civilian veterans11012.3%
Disability%
Any disability16.8%
Under 180.0%
18–64 years14.5%
65 and over49.8%

Health insurance coverage

Type%
Private insurance66.6%
Public insurance44.4%
No insurance8.4%
Uninsured under 191.7%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only1,09888.9%
Spanish00.0%
Other Indo-European00.0%
Asian & Pacific Islander00.0%
Other languages00.0%

Place of birth & citizenship

OriginCount%
Native born (US)1,23399.8%
Born in same state1,23199.7%
Born in different state92975.2%
Foreign born20.2%
Naturalized citizen20.2%
Not a US citizen2100.0%

Ancestry

AncestryCount%
Italian17414.1%
Arab1129.1%
AncestryCount%
French1038.3%
English352.8%

Technology access

Metric% of households
Computer access38.4%
Internet access90.5%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 45321

What city is ZIP code 45321 in?

ZIP code 45321 is primarily assigned to Eldorado, Ohio.

What county is ZIP code 45321 in?

ZIP code 45321 falls within Preble County, Ohio.

Is ZIP code 45321 mostly owner-occupied?

84% of occupied units in ZIP code 45321 are owner-occupied, well above the national average.

Does ZIP code 45321 have a large veteran population?

12% of civilians in ZIP code 45321 are veterans, above the national average of ~7%.

What is the typical home value in ZIP code 45321?

The median home value in ZIP code 45321 is $126,000.

What is the population of ZIP code 45321?

ZIP code 45321 has an estimated population of 1,235 residents, with a density of 87 people per square mile.

What timezone is ZIP code 45321 in?

ZIP code 45321 observes the EST timezone.

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