83631 ZIP Code — Idaho City, ID

Boise County, Idaho

ZIP code 83631 is located in Idaho City, Idaho, within Boise County. It covers approximately 168.46 square miles and serves a population of 1,484 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 208.

About ZIP code 83631

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 $254,400. Owner-occupancy is high at 80%, well above the national average.

Median household income is $56,765. The poverty rate of 4% is below the national average. 39% 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 35 minutes is near the national average. Remote work is prevalent — 30% of workers work from home.

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

Notable community characteristics include a notable veteran presence at 13% of civilians, above the national average of 7%.

Overall, ZIP code 83631 reflects a community defined by a trades-oriented workforce, a strong veteran community, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

1,484

population

168.46

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

83631 ZIP code map

Cities in ZIP code 83631

Below are the cities the US Postal Service accepts for ZIP code 83631. Using any city not on this list may result in mail delivery delays.

City	Status
Idaho City	Acceptable
Idaho City	Preferred

Nearby ZIP codes

83629 Horseshoe Bend (15.2 mi) 83714 Garden City (19.4 mi) 83714 Garden City (19.4 mi) 83702 Boise (19.4 mi)

Demographics updated 06/2026

Population
Total population	1,484
Population density	9 / sq mi
State FIPS	16
County FIPS	015

Geography
Land area	168.46 sq mi
Water area	0.02 sq mi
Latitude	43.8331
Longitude	-115.8526
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	70.9%	51.2%	41.8%
$50k – $100k	19.9%	28.6%	34.0%
$100k – $200k	9.2%	16.9%	19.5%
Over $200k	0.0%	3.3%	4.7%

Demographics & statistics

1,484

Population

People per sq mi

47.0

Median age

$56,765

Median household income

$28,677

Per capita income

$254,400

Median home value

$729

Median monthly rent

80.2%

Home ownership

3.6%

Poverty rate

11.8%

Unemployment

937

Housing units

14.0%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

119

35–44

146

45–54

55–59

60–64

117

65–74

143

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	239	16.1%
18 and over	1,245	83.9%
65 and over	404	27.2%
Median age	47.0 years

Race & ethnicity

White 81%

Hispanic or Latino 6.9%

Two or more races 6.2%

American Indian / Alaska Native 4.8%

Other race 0.7%

Asian 0.4%

Black or African American 0.1%

Group	Count	%
White	1,291	81%
Hispanic or Latino	110	6.9%
Two or more races	99	6.2%
American Indian / Alaska Native	76	4.8%
Other race	11	0.7%
Asian	6	0.4%
Black or African American	1	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	70.9%	51.2%	41.8%
$50k – $100k	19.9%	28.6%	34.0%
$100k – $200k	9.2%	16.9%	19.5%
Over $200k	0.0%	3.3%	4.7%

Under $10k 0.8%

$10k–$15k 0.5%

$15k–$25k 6.5%

$25k–$35k 26.6%

$35k–$50k 6.9%

$50k–$75k 26.7%

$75k–$100k 12.8%

$100k–$150k 14.2%

$150k–$200k 5.0%

Range	% of households
Under $10k	0.8%
$10k–$15k	0.5%
$15k–$25k	6.5%
$25k–$35k	26.6%
$35k–$50k	6.9%
$50k–$75k	26.7%
$75k–$100k	12.8%
$100k–$150k	14.2%
$150k–$200k	5.0%
Median income	$56,765

Housing

Home values

Under $50k 17.1%

$50k–$100k 12.8%

$100k–$150k 13.7%

$150k–$200k 0.8%

$200k–$300k 25.8%

$300k–$500k 2.6%

$500k–$1M 17.5%

$1M+ 9.6%

Housing overview

Metric	Value
Median home value	$254,400
Median rent / month	$729
Owner occupied	80.2%
Renter occupied	19.8%
Vacant	38.0%
Single-family detached	78.7%
Large apartment buildings	0.0%
Mobile homes	17.1%
Median rooms	5.0
Avg household size (owned)	2.26

Year built

Era	%
2020 or later	0.0%
2010–2019	1.1%
2000–2009	16.8%
1990–1999	24.5%
1980–1989	12.5%
1970–1979	19.6%
1960–1969	20.0%
1950–1959	0.3%
1940–1949	2.3%
1939 or earlier	2.9%

Bedrooms

Size	% of units
No bedroom (studio)	1.7%
1 bedroom	15.6%
2 bedrooms	44.5%
3 bedrooms	22.5%
4 bedrooms	12.3%
5+ bedrooms	3.5%

Vehicles per household

Vehicles	% of households
No vehicle	0.5%
1 vehicle	27.6%
2 vehicles	40.0%
3 or more	31.9%

Heating fuel

Fuel type	%
Utility gas	0.3%
Electricity	53.8%
Propane / LP gas	4.1%
Fuel oil	0.3%
Wood	41.5%

Households & families

Household type	Count	%
Married-couple family	444	67.1%
Cohabiting couple	18	2.7%
Male householder, no spouse	73	11.0%
Female householder, no spouse	127	19.2%
Households with children under 18	212	32.0%
Households with seniors (65+)	282	42.6%
Average household size	2.24

Marital status

Status	Male	Female
Never married	12.5%	12.3%
Married	73.9%	67.3%
Separated	0.3%	1.9%
Widowed	0.6%	16.8%
Divorced	12.7%	1.7%

Education

Less than 9th grade 1.6%

Some HS, no diploma 3.4%

HS graduate 32.2%

Some college, no degree 34.3%

Associate's degree 14.4%

Bachelor's degree 5.6%

Graduate / professional 8.4%

Metric	%
HS diploma or higher	95.0%
Bachelor's or higher	14.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	16	7.8%
Kindergarten	13	6.3%
Elementary school	75	36.4%
High school	27	13.1%
College / grad school	75	36.4%

Employment

Industry of employment

Education & healthcare 23.6%

Public administration 19.0%

Arts, food & hospitality 13.0%

Professional & management 12.3%

Retail trade 8.6%

Finance & real estate 5.6%

Manufacturing 5.2%

Wholesale trade 3.4%

Construction 3.2%

Agriculture & mining 2.8%

Other services 2.8%

Transportation & utilities 0.6%

Occupation

Category	%
Management, business & arts	49.9%
Service	34.1%
Sales & office	9.9%
Natural resources & construction	0.7%
Production & transportation	5.4%

Employment type

Type	%
Private sector	69.5%
Government	24.0%
Self-employed	6.5%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	57.8%
Carpool	0.0%
Public transit	0.0%
Walk	12.1%
Work from home	30.0%
Other means	0.2%
Avg commute (minutes)	34.6

Poverty

All people 3.6%

Under 18 years 5.0%

18 and over 3.4%

Married-couple families 0.0%

Female-led households 33.3%

Income support

Source	% of households
Social Security	38.8%
Retirement income	44.9%
Supplemental Security	3.9%
Cash public assistance	5.4%
Food stamps / SNAP	16.2%

Health indicators

Condition	%
Obesity	34.0%
High blood pressure	34.2%
High cholesterol	34.8%
Diabetes	10.8%
Heart disease	7.2%
Stroke	3.3%
Asthma	9.4%
Arthritis	26.8%
Kidney disease	3.1%
Pulmonary disease	7.1%
Cancer	7.7%

Behavior / access	%
Smoking	16.7%
Binge drinking	14.3%
No physical activity	20.9%
Less than 7 hrs sleep	30.0%
Depression	18.6%
Fair or poor health	13.7%
Poor mental health	12.5%
Poor physical health	11.4%
No health insurance	12.7%
Visited doctor (checkup)	70.3%
Visited dentist	67.7%
Cholesterol screening	90.5%
Teeth loss	12.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	162	13.0%

Disability	%
Any disability	9.4%
Under 18	13.0%
18–64 years	2.5%
65 and over	21.8%

Health insurance coverage

Type	%
Private insurance	57.3%
Public insurance	50.9%
No insurance	14.4%
Uninsured under 19	20.1%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	1,388	93.5%
Spanish	4	0.3%
Other Indo-European	4	0.3%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	1,422	95.8%
Born in same state	1,422	95.8%
Born in different state	502	33.8%
Foreign born	0	0.0%
Naturalized citizen	62	4.2%
Not a US citizen	45	72.6%

Ancestry

Ancestry	Count	%
Italian	203	13.7%
French	201	13.5%
Arab	92	6.2%
Irish	45	3%

Ancestry	Count	%
English	35	2.4%
German	10	0.7%
Dutch	8	0.5%

Technology access

Metric	% of households
Computer access	44.6%
Internet access	87.8%

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

Frequently asked questions about ZIP code 83631

What city is ZIP code 83631 in?

ZIP code 83631 is primarily assigned to Idaho City, Idaho.

What county is ZIP code 83631 in?

ZIP code 83631 falls within Boise County, Idaho.

Does ZIP code 83631 have an older population?

27% of residents in ZIP code 83631 are 65 or older, above the national average of ~17%.

How educated is the population of ZIP code 83631?

14% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

Is ZIP code 83631 mostly owner-occupied?

80% of occupied units in ZIP code 83631 are owner-occupied, well above the national average.

Does ZIP code 83631 have a large retiree population?

39% of households in ZIP code 83631 receive Social Security income, suggesting a significant retiree or disability population.

What timezone is ZIP code 83631 in?

ZIP code 83631 observes the MST timezone.