51446 ZIP Code — Irwin, IA

Shelby County, Iowa

ZIP code 51446 is located in Irwin, Iowa, within Shelby County. It covers approximately 35.77 square miles and serves a population of 483 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.

About ZIP code 51446

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 $103,100. Owner-occupancy is high at 91%, well above the national average.

The gap between median ($75,500) and mean household income suggests income inequality — a small number of higher earners pull the average up. 38% 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 25 minutes is near the national average.

College attainment at 21% is below the national average, consistent with a trades and production-oriented local economy.

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

Overall, ZIP code 51446 reflects a community defined by a strong veteran community, high homeownership, and a significant Social Security-dependent population.

483

population

35.77

sq mi land

Standard

ZIP type

Central (CT)

timezone

51446 ZIP code map

Cities in ZIP code 51446

Below are the cities the US Postal Service accepts for ZIP code 51446. Using any city not on this list may result in mail delivery delays.

City	Status
Irwin	Preferred

Nearby ZIP codes

51527 Defiance (8.5 mi) 51454 Manilla (8.6 mi) 51537 Harlan (10 mi) 51455 Manning (10.6 mi) 51543 Kimballton (10.7 mi) 51530 Earling (12.5 mi) 50025 Audubon (14.6 mi) 51531 Elk Horn (15.3 mi) 51562 Panama (15.7 mi) 51463 Templeton (17.3 mi) 51565 Portsmouth (19.4 mi) 51442 Denison (19.7 mi)

Demographics updated 05/2026

Population
Total population	483
Population density	14 / sq mi
State FIPS	19
County FIPS	165

Geography
Land area	35.77 sq mi
Water area	0.00 sq mi
Latitude	41.7692
Longitude	-95.1996
Timezone	Central (CT)
Area code	712

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	42.1%	43.2%	40.1%
$50k – $100k	38.3%	31.4%	33.4%
$100k – $200k	19.6%	20.5%	21.5%
Over $200k	0.0%	4.8%	5.0%

Demographics & statistics

483

Population

People per sq mi

50.8

Median age

$75,500

Median household income

$47,710

Per capita income

$103,100

Median home value

$575

Median monthly rent

90.7%

Home ownership

16.0%

Poverty rate

0.8%

Unemployment

223

Housing units

20.5%

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	98	20.3%
18 and over	385	79.7%
65 and over	119	24.6%
Median age	50.8 years

Race & ethnicity

White 94.3%

Two or more races 2.8%

Hispanic or Latino 2.2%

Other race 0.6%

Group	Count	%
White	466	94.3%
Two or more races	14	2.8%
Hispanic or Latino	11	2.2%
Other race	3	0.6%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	42.1%	43.2%	40.1%
$50k – $100k	38.3%	31.4%	33.4%
$100k – $200k	19.6%	20.5%	21.5%
Over $200k	0.0%	4.8%	5.0%

Under $10k 12.8%

$10k–$15k 3.5%

$15k–$25k 4.9%

$25k–$35k 9.7%

$35k–$50k 7.1%

$50k–$75k 11.5%

$75k–$100k 15.5%

$100k–$150k 20.4%

$150k–$200k 8.8%

$200k+ 5.8%

Range	% of households
Under $10k	12.8%
$10k–$15k	3.5%
$15k–$25k	4.9%
$25k–$35k	9.7%
$35k–$50k	7.1%
$50k–$75k	11.5%
$75k–$100k	15.5%
$100k–$150k	20.4%
$150k–$200k	8.8%
$200k+	5.8%
Median income	$75,500

Housing

Home values

Under $50k 19.0%

$50k–$100k 30.2%

$100k–$150k 13.7%

$150k–$200k 5.4%

$200k–$300k 20.0%

$300k–$500k 11.7%

Housing overview

Metric	Value
Median home value	$103,100
Median rent / month	$575
Owner occupied	90.7%
Renter occupied	9.3%
Vacant	7.4%
Single-family detached	95.5%
Large apartment buildings	0.0%
Mobile homes	2.0%
Median rooms	7.2
Avg household size (owned)	2.13

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	5.7%
1990–1999	0.4%
1980–1989	14.3%
1970–1979	9.4%
1960–1969	10.7%
1950–1959	10.2%
1940–1949	16.4%
1939 or earlier	32.8%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	5.7%
2 bedrooms	22.1%
3 bedrooms	25.4%
4 bedrooms	39.8%
5+ bedrooms	7.0%

Vehicles per household

Vehicles	% of households
No vehicle	2.2%
1 vehicle	19.9%
2 vehicles	28.3%
3 or more	49.6%

Heating fuel

Fuel type	%
Utility gas	56.6%
Electricity	23.5%
Propane / LP gas	19.0%
Wood	0.4%

Households & families

Household type	Count	%
Married-couple family	119	52.7%
Cohabiting couple	6	2.7%
Male householder, no spouse	48	21.2%
Female householder, no spouse	53	23.5%
Households with children under 18	68	30.1%
Households with seniors (65+)	90	39.8%
Average household size	2.14

Marital status

Status	Male	Female
Never married	27.2%	7.4%
Married	61.4%	64.7%
Separated	0.0%	0.0%
Widowed	4.0%	4.2%
Divorced	7.4%	23.7%

Education

Less than 9th grade 0.3%

Some HS, no diploma 3.8%

HS graduate 29.8%

Some college, no degree 35.3%

Associate's degree 10.4%

Bachelor's degree 13.3%

Graduate / professional 7.2%

Metric	%
HS diploma or higher	96.0%
Bachelor's or higher	20.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	5	5.9%
Kindergarten	0	0.0%
Elementary school	50	58.8%
High school	11	12.9%
College / grad school	19	22.4%

Employment

Industry of employment

Manufacturing 19.4%

Education & healthcare 18.3%

Agriculture & mining 11.5%

Retail trade 9.5%

Transportation & utilities 9.5%

Other services 7.5%

Construction 5.6%

Wholesale trade 5.6%

Professional & management 5.2%

Finance & real estate 2.8%

Arts, food & hospitality 2.4%

Public administration 2.4%

Information 0.4%

Occupation

Category	%
Management, business & arts	38.1%
Service	9.5%
Sales & office	20.6%
Natural resources & construction	7.5%
Production & transportation	24.2%

Employment type

Type	%
Private sector	61.1%
Government	21.8%
Self-employed	17.1%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	77.0%
Carpool	6.2%
Public transit	0.0%
Walk	6.2%
Work from home	7.4%
Other means	3.3%
Avg commute (minutes)	25.4

Poverty

All people 16.0%

Under 18 years 32.3%

18 and over 11.9%

Married-couple families 0.8%

Female-led households 85.7%

Income support

Source	% of households
Social Security	37.6%
Retirement income	22.1%
Supplemental Security	3.5%
Cash public assistance	11.5%
Food stamps / SNAP	8.8%

Health indicators

Condition	%
Obesity	38.0%
High blood pressure	39.6%
High cholesterol	38.7%
Diabetes	11.7%
Heart disease	8.4%
Stroke	3.6%
Asthma	8.7%
Arthritis	29.9%
Kidney disease	3.4%
Pulmonary disease	7.5%
Cancer	9.4%

Behavior / access	%
Smoking	14.8%
Binge drinking	18.7%
No physical activity	24.6%
Less than 7 hrs sleep	28.5%
Depression	16.0%
Fair or poor health	12.7%
Poor mental health	11.4%
Poor physical health	9.9%
No health insurance	8.2%
Visited doctor (checkup)	77.9%
Visited dentist	72.9%
Cholesterol screening	91.9%
Teeth loss	11.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	47	12.2%

Disability	%
Any disability	12.4%
Under 18	4.1%
18–64 years	10.5%
65 and over	23.5%

Health insurance coverage

Type	%
Private insurance	63.1%
Public insurance	47.4%
No insurance	5.2%
Uninsured under 19	4.9%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	462	95.7%
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)	481	99.6%
Born in same state	481	99.6%
Born in different state	332	68.7%
Foreign born	0	0.0%
Naturalized citizen	2	0.4%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	65	13.5%
Polish	34	7%
Dutch	30	6.2%
English	27	5.6%

Ancestry	Count	%
German	25	5.2%
Arab	11	2.3%
French	9	1.9%

Technology access

Metric	% of households
Computer access	46.8%
Internet access	91.2%

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

Frequently asked questions about ZIP code 51446

What city is ZIP code 51446 in?

ZIP code 51446 is primarily assigned to Irwin, Iowa.

What county is ZIP code 51446 in?

ZIP code 51446 falls within Shelby County, Iowa.

Is ZIP code 51446 mostly owner-occupied?

91% of occupied units in ZIP code 51446 are owner-occupied, well above the national average.

What is the poverty rate in ZIP code 51446?

16% of residents in ZIP code 51446 live below the poverty line, above the national average.

Does ZIP code 51446 have a large retiree population?

38% of households in ZIP code 51446 receive Social Security income, suggesting a significant retiree or disability population.

Does ZIP code 51446 have a large veteran population?

12% of civilians in ZIP code 51446 are veterans, above the national average of ~7%.

What timezone is ZIP code 51446 in?

ZIP code 51446 observes the CST timezone.