83428 ZIP Code — Irwin, ID

Bonneville County, Idaho

ZIP code 83428 is located in Irwin, Idaho, within Bonneville County. It covers approximately 248.97 square miles and serves a population of 525 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 208.

About ZIP code 83428

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 2000s, giving the area an established character. Median home value is $514,100. Owner-occupancy is high at 94%, well above the national average.

The gap between median ($64,219) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 4% is below the national average. 37% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with agriculture and mining as the leading industry. The average commute of 31 minutes is near the national average. Remote work is prevalent — 21% of workers work from home.

Educational attainment is near the national average, with 30% of residents holding a bachelor's degree or higher.

21% of residents lack health insurance, above the national average.

Overall, ZIP code 83428 reflects a community defined by high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

525

population

248.97

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

83428 ZIP code map

Cities in ZIP code 83428

Below are the cities the US Postal Service accepts for ZIP code 83428. Using any city not on this list may result in mail delivery delays.

City	Status
Irwin	Acceptable
Irwin	Preferred

Nearby ZIP codes

83449 Swan Valley (3.2 mi) 83455 Victor (15.9 mi) 83014 Wilson (17.9 mi)

Demographics updated 06/2026

Population
Total population	525
Population density	2 / sq mi
State FIPS	16
County FIPS	019

Geography
Land area	248.97 sq mi
Water area	23.94 sq mi
Latitude	43.3784
Longitude	-111.2566
Timezone	Mountain (MT)
Area code	208

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	43.2%	39.7%	41.8%
$50k – $100k	31.3%	34.3%	34.0%
$100k – $200k	14.0%	20.7%	19.5%
Over $200k	11.5%	5.3%	4.7%

Demographics & statistics

525

Population

People per sq mi

56.5

Median age

$64,219

Median household income

$66,660

Per capita income

$514,100

Median home value

Median monthly rent

93.6%

Home ownership

4.4%

Poverty rate

22.7%

Unemployment

474

Housing units

30.4%

Bachelor's or higher

Age distribution

Male Female

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	58	11.0%
18 and over	467	89.0%
65 and over	122	23.2%
Median age	56.5 years

Race & ethnicity

White 97%

Hispanic or Latino 1.5%

Two or more races 1.5%

Group	Count	%
White	517	97%
Hispanic or Latino	8	1.5%
Two or more races	8	1.5%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	43.2%	39.7%	41.8%
$50k – $100k	31.3%	34.3%	34.0%
$100k – $200k	14.0%	20.7%	19.5%
Over $200k	11.5%	5.3%	4.7%

Under $10k 8.2%

$10k–$15k 1.8%

$15k–$25k 4.6%

$25k–$35k 0.5%

$35k–$50k 10.5%

$50k–$75k 33.8%

$75k–$100k 9.6%

$100k–$150k 15.5%

$150k–$200k 2.3%

$200k+ 13.2%

Range	% of households
Under $10k	8.2%
$10k–$15k	1.8%
$15k–$25k	4.6%
$25k–$35k	0.5%
$35k–$50k	10.5%
$50k–$75k	33.8%
$75k–$100k	9.6%
$100k–$150k	15.5%
$150k–$200k	2.3%
$200k+	13.2%
Median income	$64,219

Housing

Home values

Under $50k 2.4%

$50k–$100k 1.5%

$100k–$150k 2.0%

$150k–$200k 6.3%

$200k–$300k 13.2%

$300k–$500k 22.9%

$500k–$1M 46.3%

$1M+ 5.4%

Housing overview

Metric	Value
Median home value	$514,100
Median rent / month	$0
Owner occupied	93.6%
Renter occupied	6.4%
Vacant	55.1%
Single-family detached	84.6%
Large apartment buildings	0.0%
Mobile homes	11.1%
Median rooms	5.6
Avg household size (owned)	2.45

Year built

Era	%
2020 or later	0.0%
2010–2019	5.9%
2000–2009	33.4%
1990–1999	8.4%
1980–1989	9.0%
1970–1979	17.4%
1960–1969	9.6%
1950–1959	4.7%
1940–1949	0.2%
1939 or earlier	11.3%

Bedrooms

Size	% of units
No bedroom (studio)	0.8%
1 bedroom	10.9%
2 bedrooms	15.4%
3 bedrooms	49.8%
4 bedrooms	11.9%
5+ bedrooms	11.3%

Vehicles per household

Vehicles	% of households
No vehicle	0.9%
1 vehicle	15.5%
2 vehicles	22.4%
3 or more	61.2%

Heating fuel

Fuel type	%
Utility gas	10.5%
Electricity	36.1%
Propane / LP gas	35.6%
Wood	10.0%
Solar	2.3%

Households & families

Household type	Count	%
Married-couple family	153	69.9%
Cohabiting couple	7	3.2%
Male householder, no spouse	24	11.0%
Female householder, no spouse	35	16.0%
Households with children under 18	30	13.7%
Households with seniors (65+)	88	40.2%
Average household size	2.40

Marital status

Status	Male	Female
Never married	6.4%	6.2%
Married	85.0%	78.0%
Separated	0.0%	1.7%
Widowed	0.0%	9.5%
Divorced	8.6%	4.6%

Education

Less than 9th grade 0.5%

Some HS, no diploma 1.1%

HS graduate 31.7%

Some college, no degree 25.7%

Associate's degree 10.6%

Bachelor's degree 25.1%

Graduate / professional 5.3%

Metric	%
HS diploma or higher	98.4%
Bachelor's or higher	30.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	0	0.0%
Elementary school	46	30.7%
High school	17	11.3%
College / grad school	87	58.0%

Employment

Industry of employment

Agriculture & mining 19.1%

Professional & management 16.2%

Education & healthcare 15.4%

Construction 11.0%

Manufacturing 8.1%

Finance & real estate 8.1%

Arts, food & hospitality 8.1%

Retail trade 4.4%

Transportation & utilities 3.7%

Public administration 3.7%

Other services 2.2%

Occupation

Category	%
Management, business & arts	39.7%
Service	14.7%
Sales & office	16.9%
Natural resources & construction	11.0%
Production & transportation	17.6%

Employment type

Type	%
Private sector	70.6%
Government	19.9%
Self-employed	9.6%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	66.9%
Carpool	8.1%
Public transit	0.0%
Walk	4.4%
Work from home	20.6%
Other means	0.0%
Avg commute (minutes)	30.5

Poverty

All people 4.4%

Under 18 years 0.0%

18 and over 4.9%

Married-couple families 2.6%

Female-led households 0.0%

Income support

Source	% of households
Social Security	36.5%
Retirement income	26.9%
Supplemental Security	4.6%
Cash public assistance	0.0%
Food stamps / SNAP	9.6%

Health indicators

Condition	%
Obesity	32.3%
High blood pressure	32.7%
High cholesterol	35.2%
Diabetes	9.9%
Heart disease	7.1%
Stroke	2.9%
Asthma	8.6%
Arthritis	25.2%
Kidney disease	3.0%
Pulmonary disease	5.7%
Cancer	8.3%

Behavior / access	%
Smoking	12.7%
Binge drinking	12.0%
No physical activity	18.8%
Less than 7 hrs sleep	27.6%
Depression	17.5%
Fair or poor health	10.8%
Poor mental health	10.8%
Poor physical health	9.4%
No health insurance	11.4%
Visited doctor (checkup)	72.6%
Visited dentist	74.9%
Cholesterol screening	91.7%
Teeth loss	10.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	17	3.6%

Disability	%
Any disability	11.8%
Under 18	0.0%
18–64 years	6.7%
65 and over	32.0%

Health insurance coverage

Type	%
Private insurance	58.1%
Public insurance	37.1%
No insurance	21.1%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	525	100.0%
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)	523	99.6%
Born in same state	522	99.4%
Born in different state	223	42.5%
Foreign born	1	0.2%
Naturalized citizen	2	0.4%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
French	212	40.4%
Italian	55	10.5%
Dutch	40	7.6%
Arab	25	4.8%

Ancestry	Count	%
English	7	1.3%
Polish	5	1%
German	1	0.2%

Technology access

Metric	% of households
Computer access	41.7%
Internet access	93.6%

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

Frequently asked questions about ZIP code 83428

What city is ZIP code 83428 in?

ZIP code 83428 is primarily assigned to Irwin, Idaho.

What county is ZIP code 83428 in?

ZIP code 83428 falls within Bonneville County, Idaho.

Is ZIP code 83428 mostly owner-occupied?

94% of occupied units in ZIP code 83428 are owner-occupied, well above the national average.

Does ZIP code 83428 have a large retiree population?

37% of households in ZIP code 83428 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 83428?

The median home value in ZIP code 83428 is $514,100.

What is the population of ZIP code 83428?

ZIP code 83428 has an estimated population of 525 residents, with a density of 2 people per square mile.

What timezone is ZIP code 83428 in?

ZIP code 83428 observes the MST timezone.