Eldorado ZIP Codes — Preble County, OH

There is one unique ZIP code in Eldorado, Ohio and it is 45321. Area code: 326/937/513.

ZIP codes

14.12

sq mi land

0.01

sq mi water

326/937/513

area code

Eldorado, OH ZIP code map

About Eldorado, OH

Eldorado, Ohio, is a small village situated in Preble County, rich with rural charm and community spirit. This quaint locale offers a peaceful atmosphere that is perfect for residents who appreciate the beauty of Ohio's countryside. With its single ZIP code 45321, Eldorado serves as a serene escape for those looking to enjoy small-town living.

Location & geography

Eldorado is located in southwestern Ohio and is roughly 10 miles from the larger city of Eaton, making it accessible for residents seeking additional amenities. The village spans a land area of 14.12 square miles, with a mere 0.01 square miles designated as water, illustrating its predominantly land-based geography. Nestled among lush landscapes and agricultural fields, Eldorado showcases the natural beauty that characterizes much of Preble County.

Community & economy

The character of Eldorado is defined by its close-knit community and friendly atmosphere, where residents often engage in local events and activities. The village's economy primarily revolves around agriculture, along with small family-owned businesses which contribute to the local culture and economy. Daily life in Eldorado offers a slower pace, allowing residents to enjoy both the tranquility of rural living and the camaraderie of their neighbors.

Transportation

Eldorado is conveniently connected via local roads and is in proximity to State Route 503, which provides access to neighboring towns and cities. The nearest major highways facilitate travel to larger urban areas, while Dayton International Airport is the closest airport, located about 30 miles to the southeast. Public transportation options are limited, but personal vehicles are the primary mode of transit for residents.

History

Founded in the mid-19th century, Eldorado has roots in agricultural development which has shaped its identity over the years. The village has seen various industries come and go, yet agriculture continues to play a vital role in its community and economy. Notable events in its history include local fairs and community gatherings that celebrate its heritage and foster a strong sense of belonging among residents.

Did you know?

One surprising fact about Eldorado is that despite its small size, the village has a rich musical heritage, with local events featuring performances by regional talent. Additionally, Eldorado is known for its picturesque landscapes and seasonal festivals that attract visitors from surrounding areas.

ZIP codes for Eldorado, OH (1)

ZIP code	City	County	Map
45321	Eldorado	Preble	View map

Demographics & statistics

1,235

Population

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

Under 5

5–9

10–14

15–19

20–24

119

25–34

121

35–44

45–54

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	344	27.9%
18 and over	891	72.1%
65 and over	221	17.9%
Median age	29.8 years

Race & ethnicity

White 97%

Two or more races 2.5%

Black or African American 0.5%

Group	Count	%
White	1,198	97%
Two or more races	31	2.5%
Black or African American	6	0.5%

Household income

$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–$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%
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

Metric	Value
Median home value	$126,000
Median rent / month	$978
Owner occupied	83.8%
Renter occupied	16.2%
Vacant	2.7%
Single-family detached	98.2%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	6.3
Avg household size (owned)	2.60

Year built

Era	%
2020 or later	0.0%
2010–2019	2.5%
2000–2009	0.4%
1990–1999	4.9%
1980–1989	3.5%
1970–1979	5.3%
1960–1969	7.0%
1950–1959	8.0%
1940–1949	7.4%
1939 or earlier	61.0%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	1.2%
2 bedrooms	20.1%
3 bedrooms	67.6%
4 bedrooms	11.1%
5+ bedrooms	0.0%

Vehicles per household

Vehicles	% of households
No vehicle	3.2%
1 vehicle	23.6%
2 vehicles	44.3%
3 or more	28.9%

Heating fuel

Fuel type	%
Utility gas	59.5%
Electricity	17.1%
Propane / LP gas	18.6%
Wood	0.8%
Solar	0.8%

Households & families

Household type	Count	%
Married-couple family	280	59.1%
Cohabiting couple	21	4.4%
Male householder, no spouse	73	15.4%
Female householder, no spouse	100	21.1%
Households with children under 18	186	39.2%
Households with seniors (65+)	161	34.0%
Average household size	2.61

Marital status

Status	Male	Female
Never married	14.6%	23.6%
Married	68.7%	53.5%
Separated	0.5%	1.9%
Widowed	8.2%	7.6%
Divorced	8.0%	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 higher	88.6%
Bachelor's or higher	17.6%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	10	3.9%
Elementary school	136	52.9%
High school	67	26.1%
College / grad school	44	17.1%

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 & arts	37.3%
Service	10.9%
Sales & office	10.9%
Natural resources & construction	14.9%
Production & transportation	26.0%

Employment type

Type	%
Private sector	83.6%
Government	5.4%
Self-employed	9.8%
Unpaid family workers	1.3%

Commute

Method	%
Drive alone	83.7%
Carpool	12.8%
Public transit	0.0%
Walk	0.0%
Other means	0.0%
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 Security	35.0%
Retirement income	24.1%
Supplemental Security	5.1%
Cash public assistance	0.0%
Food stamps / SNAP	2.1%

Health indicators

Condition	%
High blood pressure	33.7%
High cholesterol	32.4%
Heart disease	7.2%
Stroke	3.3%
Asthma	10.2%
Arthritis	28.7%
Kidney disease	2.9%
Pulmonary disease	9.5%
Cancer	6.6%

Behavior / access	%
Binge drinking	17.3%
No physical activity	28.4%
Less than 7 hrs sleep	37.1%
Fair or poor health	16.1%
Poor mental health	17.1%
Poor physical health	11.5%
No health insurance	12.5%
Visited doctor (checkup)	75.4%
Visited dentist	61.9%
Cholesterol screening	87.6%
Teeth loss	16.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	110	12.3%

Disability	%
Any disability	16.8%
Under 18	0.0%
18–64 years	14.5%
65 and over	49.8%

Health insurance coverage

Type	%
Private insurance	66.6%
Public insurance	44.4%
Uninsured under 19	1.7%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	1,098	88.9%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	1,233	99.8%
Born in same state	1,231	99.7%
Born in different state	929	75.2%
Foreign born	2	0.2%
Naturalized citizen	2	0.2%
Not a US citizen	2	100.0%

Ancestry

Ancestry	Count	%
Italian	174	14.1%
Arab	112	9.1%

Ancestry	Count	%
French	103	8.3%
English	35	2.8%

Technology access

Metric	% of households
Computer access	38.4%
Internet access	90.5%

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

Frequently asked questions

What ZIP codes does Eldorado, OH have?

Eldorado, OH has one ZIP code: 45321. Each ZIP code serves a distinct delivery area within the city and surrounding region.