45312 ZIP Code — Casstown, OH

Miami County, Ohio

ZIP code 45312 is located in Casstown, Ohio, within Miami County. It covers approximately 27.33 square miles and serves a population of 947 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 326/937.

About ZIP code 45312

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 $198,900. Owner-occupancy is high at 87%, well above the national average.

Median household income is $64,545. 45% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 23 minutes is near the national average.

College attainment at 13% is below the national average, consistent with a trades and production-oriented local economy.

Health indicators show elevated rates of smoking (23%) compared to national benchmarks.

Notable community characteristics include a notable veteran presence at 14% of civilians, above the national average of 7%.

Overall, ZIP code 45312 reflects a community defined by a trades-oriented workforce, a strong veteran community, high homeownership, and a significant Social Security-dependent population.

947

population

27.33

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

45312 ZIP code map

Cities in ZIP code 45312

Below are the cities the US Postal Service accepts for ZIP code 45312. Using any city not on this list may result in mail delivery delays.

City	Status
Casstown	Preferred

Nearby ZIP codes

45373 Troy (5.7 mi) 45374 Troy (6.6 mi) 45344 New Carlisle (8.2 mi) 45317 Conover (8.4 mi) 43072 Saint Paris (8.5 mi) 45371 Tipp City (9.6 mi) 45356 Piqua (10.8 mi) 45341 Medway (12.6 mi) 45504 Springfield (12.8 mi) 45377 Vandalia (14 mi) 45359 Pleasant Hill (14.2 mi) 45339 Ludlow Falls (14.4 mi)

Demographics updated 05/2026

Population
Total population	947
Population density	35 / sq mi
State FIPS	39
County FIPS	109

Geography
Land area	27.33 sq mi
Water area	0.01 sq mi
Latitude	40.0569
Longitude	-84.0803
Timezone	Eastern (ET)
Area code	326/937

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	29.4%	38.3%	43.3%
$50k – $100k	44.7%	36.3%	31.4%
$100k – $200k	17.5%	21.9%	20.0%
Over $200k	8.5%	3.5%	5.2%

Demographics & statistics

947

Population

People per sq mi

51.4

Median age

$64,545

Median household income

$36,823

Per capita income

$198,900

Median home value

$1,057

Median monthly rent

86.7%

Home ownership

0.6%

Poverty rate

7.0%

Unemployment

398

Housing units

12.7%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	177	18.7%
18 and over	770	81.3%
65 and over	302	31.9%
Median age	51.4 years

Race & ethnicity

White 94.4%

Two or more races 3.5%

Hispanic or Latino 2.1%

Group	Count	%
White	913	94.4%
Two or more races	34	3.5%
Hispanic or Latino	20	2.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	29.4%	38.3%	43.3%
$50k – $100k	44.7%	36.3%	31.4%
$100k – $200k	17.5%	21.9%	20.0%
Over $200k	8.5%	3.5%	5.2%

Under $10k 1.4%

$15k–$25k 8.5%

$25k–$35k 11.6%

$35k–$50k 9.9%

$50k–$75k 26.3%

$75k–$100k 17.9%

$100k–$150k 16.9%

$150k–$200k 3.6%

$200k+ 3.9%

Range	% of households
Under $10k	1.4%
$15k–$25k	8.5%
$25k–$35k	11.6%
$35k–$50k	9.9%
$50k–$75k	26.3%
$75k–$100k	17.9%
$100k–$150k	16.9%
$150k–$200k	3.6%
$200k+	3.9%
Median income	$64,545

Housing

Home values

Under $50k 1.9%

$50k–$100k 7.5%

$100k–$150k 17.3%

$150k–$200k 23.7%

$200k–$300k 26.7%

$300k–$500k 16.4%

$500k–$1M 3.9%

$1M+ 2.5%

Housing overview

Metric	Value
Median home value	$198,900
Median rent / month	$1,057
Owner occupied	86.7%
Renter occupied	13.3%
Vacant	8.6%
Single-family detached	95.6%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	6.7
Avg household size (owned)	2.26

Year built

Era	%
2020 or later	0.0%
2010–2019	0.7%
2000–2009	6.6%
1990–1999	11.5%
1980–1989	3.8%
1970–1979	14.3%
1960–1969	13.7%
1950–1959	3.1%
1940–1949	6.2%
1939 or earlier	40.2%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	3.8%
2 bedrooms	9.9%
3 bedrooms	61.8%
4 bedrooms	19.9%
5+ bedrooms	4.6%

Vehicles per household

Vehicles	% of households
No vehicle	0.2%
1 vehicle	19.8%
2 vehicles	50.5%
3 or more	29.5%

Heating fuel

Fuel type	%
Utility gas	21.7%
Electricity	31.9%
Propane / LP gas	23.9%
Fuel oil	7.7%
Wood	5.1%

Households & families

Household type	Count	%
Married-couple family	227	54.8%
Cohabiting couple	8	1.9%
Male householder, no spouse	98	23.7%
Female householder, no spouse	81	19.6%
Households with children under 18	85	20.5%
Households with seniors (65+)	178	43.0%
Average household size	2.29

Marital status

Status	Male	Female
Never married	27.5%	17.0%
Married	56.1%	60.1%
Separated	3.0%	3.1%
Widowed	7.2%	12.8%
Divorced	6.2%	7.0%

Education

Less than 9th grade 1.5%

Some HS, no diploma 2.4%

HS graduate 31.6%

Some college, no degree 40.1%

Associate's degree 11.8%

Bachelor's degree 10.0%

Graduate / professional 2.7%

Metric	%
HS diploma or higher	96.1%
Bachelor's or higher	12.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	4	2.1%
Kindergarten	6	3.2%
Elementary school	85	44.7%
High school	63	33.2%
College / grad school	32	16.8%

Employment

Industry of employment

Education & healthcare 19.2%

Manufacturing 15.8%

Professional & management 12.2%

Retail trade 11.9%

Arts, food & hospitality 11.1%

Construction 7.8%

Agriculture & mining 5.4%

Other services 4.1%

Public administration 3.4%

Wholesale trade 3.1%

Finance & real estate 3.1%

Transportation & utilities 2.1%

Information 0.8%

Occupation

Category	%
Management, business & arts	30.3%
Service	23.8%
Sales & office	19.9%
Natural resources & construction	11.9%
Production & transportation	14.0%

Employment type

Type	%
Private sector	79.5%
Government	11.1%
Self-employed	9.3%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	78.0%
Carpool	15.8%
Public transit	0.0%
Walk	0.0%
Work from home	6.2%
Other means	0.0%
Avg commute (minutes)	22.5

Poverty

All people 0.6%

Under 18 years 0.0%

18 and over 0.8%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	45.4%
Retirement income	25.8%
Supplemental Security	5.3%
Cash public assistance	0.5%
Food stamps / SNAP	1.0%

Health indicators

Condition	%
Obesity	35.1%
High blood pressure	34.6%
High cholesterol	33.1%
Diabetes	11.3%
Heart disease	7.6%
Stroke	3.3%
Asthma	9.8%
Arthritis	29.1%
Kidney disease	3.0%
Pulmonary disease	9.0%
Cancer	7.4%

Behavior / access	%
Smoking	22.8%
Binge drinking	18.3%
No physical activity	26.3%
Less than 7 hrs sleep	35.3%
Depression	23.8%
Fair or poor health	14.3%
Poor mental health	16.0%
Poor physical health	10.6%
No health insurance	11.3%
Visited doctor (checkup)	74.1%
Visited dentist	63.9%
Cholesterol screening	89.3%
Teeth loss	13.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	108	14.0%

Disability	%
Any disability	16.7%
Under 18	0.0%
18–64 years	9.4%
65 and over	37.7%

Health insurance coverage

Type	%
Private insurance	78.7%
Public insurance	39.4%
No insurance	4.5%
Uninsured under 19	6.2%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	908	95.9%
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)	947	100.0%
Born in same state	947	100.0%
Born in different state	828	87.4%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Arab	154	16.3%
French	132	13.9%

Ancestry	Count	%
Italian	52	5.5%
Polish	3	0.3%

Technology access

Metric	% of households
Computer access	43.7%
Internet access	90.6%

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

Frequently asked questions about ZIP code 45312

What city is ZIP code 45312 in?

ZIP code 45312 is primarily assigned to Casstown, Ohio.

What county is ZIP code 45312 in?

ZIP code 45312 falls within Miami County, Ohio.

Does ZIP code 45312 have an older population?

32% of residents in ZIP code 45312 are 65 or older, above the national average of ~17%.

Is ZIP code 45312 mostly owner-occupied?

87% of occupied units in ZIP code 45312 are owner-occupied, well above the national average.

How educated is the population of ZIP code 45312?

13% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

Does ZIP code 45312 have a large retiree population?

45% of households in ZIP code 45312 receive Social Security income, suggesting a significant retiree or disability population.

What timezone is ZIP code 45312 in?

ZIP code 45312 observes the EST timezone.