Idaho City ZIP Code List — Boise County, ID

There is one unique ZIP code in Idaho City, Idaho and it is 83631. Area code: 208.

ZIP codes

168.46

sq mi land

0.02

sq mi water

208

area code

Idaho City, ID ZIP code map

About Idaho City, ID

Idaho City, Idaho, is a historic town located in the heart of Boise County. Known for its rich mining heritage, this charming community attracts visitors with its scenic landscapes and outdoor recreational opportunities. The city is a gateway to the Sawtooth National Forest, making it a popular destination for nature enthusiasts and history buffs alike.

Location & geography

Idaho City is situated approximately 36 miles northeast of Boise, the capital of Idaho, and about 20 miles southwest of the small town of Garden Valley. The city covers a total land area of 168.46 square miles, while its water area is a mere 0.02 square miles. The terrain is characterized by mountainous landscapes and dense forests, offering stunning views and hiking trails.

Community & economy

Idaho City exudes a cozy, small-town atmosphere that fosters community engagement and a strong sense of local pride. The economy has historically revolved around mining and timber, but today it also embraces tourism as visitors flock to experience its rich past and outdoor activities. Daily life in Idaho City is relaxed, with community events and local gatherings often celebrating the unique cultural heritage.

Transportation

Idaho City is accessible via State Highway 21, which connects it to Boise and other nearby towns. The nearest major airport is Boise Airport, located about 36 miles away, offering both domestic and limited international flights. Local transit options are minimal, as the city is primarily suited for personal vehicles and outdoor exploration.

History

Idaho City was founded during the gold rush of the 1860s and quickly became a bustling mining town. Its rich mining history significantly contributed to the growth of the region, attracting settlers and entrepreneurs looking to capitalize on the area’s resources. Today, remnants of its past can be seen in the well-preserved historic buildings that line the streets.

Did you know?

One surprising fact about Idaho City is that it was once the largest city in the Idaho Territory, even surpassing Boise in population during the height of the gold rush. Additionally, the area is known for its historical resources, including the Old Idaho Penitentiary, which housed some of the territory's most notorious criminals.

ZIP codes for Idaho City, ID (1)

ZIP code	City	County	Map
83631	Idaho City	Boise	View map

Demographics & statistics

1,484

Population

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

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%
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	%
High blood pressure	34.2%
High cholesterol	34.8%
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	%
Binge drinking	14.3%
No physical activity	20.9%
Less than 7 hrs sleep	30.0%
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%
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

What is the ZIP code for Idaho City, ID?

Idaho City, ID has one ZIP code: 83631.

What is the main ZIP code for Idaho City, ID?

The primary ZIP code for Idaho City, ID is 83631. The city uses area code 208 for phone service.

What county is Idaho City, ID in?

Idaho City is located in Boise County, Idaho.

How many ZIP codes are in Idaho City, ID?

Idaho City, ID has 1 ZIP code.

What ZIP code serves the Historic Idaho City downtown area and Gold Rush-era buildings?

The historic downtown district of Idaho City, including its Gold Rush-era main street and landmarks, is located in ZIP code 83631, which covers the entire city.

What is the ZIP code for Idaho City's residential neighborhoods near the Boise River?

All residential areas of Idaho City, including those adjacent to the Boise River, use the single ZIP code 83631, as it encompasses the entire municipality in Boise County.