83421 ZIP Code — Chester, ID

Fremont County, Idaho

ZIP code 83421 is located in Chester, Idaho, within Fremont County. It covers approximately 11.69 square miles and serves a population of 379 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 208.

About ZIP code 83421

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1990s, giving the area an established character. Median home value is $251,400.

Median household income is $76,424. SNAP benefit usage at 21% of households reflects economic stress in the area. 47% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is sales and office, with retail trade as the leading industry. An above-average commute of 60 minutes suggests many residents work outside the immediate area.

College attainment at 14% is below the national average, consistent with a trades and production-oriented local economy.

Overall, ZIP code 83421 reflects a community defined by a trades-oriented workforce, high homeownership, a significant Social Security-dependent population, and elevated reliance on food assistance.

379

population

11.69

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

83421 ZIP code map

Cities in ZIP code 83421

Below are the cities the US Postal Service accepts for ZIP code 83421. Using any city not on this list may result in mail delivery delays.

City	Status
Chester	Acceptable

Demographics updated 06/2026

Population
Total population	379
Population density	32 / sq mi
State FIPS	16
County FIPS	043

Geography
Land area	11.69 sq mi
Water area	0.15 sq mi
Latitude	43.9987
Longitude	-111.5481
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	40.0%	42.4%	41.8%
$50k – $100k	50.3%	37.8%	34.0%
$100k – $200k	9.7%	18.3%	19.5%
Over $200k	0.0%	1.5%	4.7%

Demographics & statistics

379

Population

People per sq mi

35.6

Median age

$76,424

Median household income

$36,053

Per capita income

$251,400

Median home value

Median monthly rent

100.0%

Home ownership

0.0%

Poverty rate

0.0%

Unemployment

201

Housing units

14.4%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

15–19

25–34

35–44

45–54

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	108	28.5%
18 and over	271	71.5%
65 and over	95	25.1%
Median age	35.6 years

Race & ethnicity

White 100%

Group	Count	%
White	379	100%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	40.0%	42.4%	41.8%
$50k – $100k	50.3%	37.8%	34.0%
$100k – $200k	9.7%	18.3%	19.5%
Over $200k	0.0%	1.5%	4.7%

$50k–$75k 38.2%

$75k–$100k 53.2%

$150k–$200k 8.7%

Range	% of households
$50k–$75k	38.2%
$75k–$100k	53.2%
$150k–$200k	8.7%
Median income	$76,424

Housing

Home values

$100k–$150k 20.8%

$150k–$200k 28.3%

$200k–$300k 31.8%

$300k–$500k 10.4%

$1M+ 8.7%

Housing overview

Metric	Value
Median home value	$251,400
Median rent / month	$0
Owner occupied	100.0%
Renter occupied	0.0%
Vacant	13.9%
Single-family detached	100.0%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	4.6
Avg household size (owned)	2.19

Year built

Era	%
2020 or later	0.0%
2010–2019	16.4%
2000–2009	0.0%
1990–1999	42.3%
1980–1989	0.0%
1970–1979	27.4%
1960–1969	13.9%
1950–1959	0.0%
1940–1949	0.0%
1939 or earlier	0.0%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	0.0%
2 bedrooms	28.4%
3 bedrooms	39.8%
4 bedrooms	18.9%
5+ bedrooms	12.9%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	10.4%
2 vehicles	46.8%
3 or more	42.8%

Heating fuel

Fuel type	%
Utility gas	6.4%
Electricity	66.5%
Fuel oil	6.4%
Wood	20.8%

Households & families

Household type	Count	%
Married-couple family	118	68.2%
Cohabiting couple	0	0.0%
Male householder, no spouse	55	31.8%
Female householder, no spouse	0	0.0%
Households with children under 18	92	53.2%
Households with seniors (65+)	81	46.8%
Average household size	2.19

Marital status

Status	Male	Female
Never married	0.0%	24.2%
Married	75.1%	75.8%
Separated	0.0%	0.0%
Widowed	24.9%	0.0%
Divorced	0.0%	0.0%

Education

Less than 9th grade 0.0%

Some HS, no diploma 0.0%

HS graduate 42.1%

Some college, no degree 27.3%

Associate's degree 16.2%

Bachelor's degree 14.4%

Graduate / professional 0.0%

Metric	%
HS diploma or higher	100.0%
Bachelor's or higher	14.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	15	12.9%
Kindergarten	0	0.0%
Elementary school	0	0.0%
High school	30	25.9%
College / grad school	71	61.2%

Employment

Industry of employment

Retail trade 28.1%

Professional & management 24.0%

Construction 22.8%

Education & healthcare 14.4%

Agriculture & mining 10.8%

Occupation

Category	%
Management, business & arts	25.1%
Service	24.0%
Sales & office	28.1%
Natural resources & construction	0.0%
Production & transportation	22.8%

Employment type

Type	%
Private sector	50.9%
Government	25.1%
Self-employed	24.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	100.0%
Carpool	0.0%
Public transit	0.0%
Walk	0.0%
Work from home	0.0%
Other means	0.0%
Avg commute (minutes)	60.3

Poverty

All people 0.0%

Under 18 years 0.0%

18 and over 0.0%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	46.8%
Retirement income	46.8%
Supplemental Security	0.0%
Cash public assistance	20.8%
Food stamps / SNAP	20.8%

Health indicators

Condition	%
Obesity	33.6%
High blood pressure	34.0%
High cholesterol	33.3%
Diabetes	11.2%
Heart disease	7.8%
Stroke	3.6%
Asthma	10.0%
Arthritis	26.9%
Kidney disease	3.3%
Pulmonary disease	7.9%
Cancer	7.2%

Behavior / access	%
Smoking	18.3%
Binge drinking	14.0%
No physical activity	24.4%
Less than 7 hrs sleep	31.6%
Depression	19.7%
Fair or poor health	16.0%
Poor mental health	14.1%
Poor physical health	12.4%
No health insurance	17.3%
Visited doctor (checkup)	69.2%
Visited dentist	60.8%
Cholesterol screening	86.0%
Teeth loss	16.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	26	9.6%

Disability	%
Any disability	11.6%
Under 18	0.0%
18–64 years	0.0%
65 and over	46.3%

Health insurance coverage

Type	%
Private insurance	97.1%
Public insurance	53.0%
No insurance	0.0%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	316	83.4%
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)	379	100.0%
Born in same state	379	100.0%
Born in different state	131	34.6%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Arab	44	11.6%
Italian	35	9.2%

Ancestry	Count	%
French	29	7.7%

Technology access

Metric	% of households
Computer access	45.6%
Internet access	100.0%

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

Frequently asked questions about ZIP code 83421

What city is ZIP code 83421 in?

ZIP code 83421 is primarily assigned to Chester, Idaho.

What county is ZIP code 83421 in?

ZIP code 83421 falls within Fremont County, Idaho.

Does ZIP code 83421 have an older population?

25% of residents in ZIP code 83421 are 65 or older, above the national average of ~17%.

Does ZIP code 83421 have a large retiree population?

47% of households in ZIP code 83421 receive Social Security income, suggesting a significant retiree or disability population.

How educated is the population of ZIP code 83421?

14% 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 83421 have a large veteran population?

10% of civilians in ZIP code 83421 are veterans, above the national average of ~7%.

What timezone is ZIP code 83421 in?

ZIP code 83421 observes the MST timezone.