Mackay ZIP Code List — Custer County, ID

There is one unique ZIP code in Mackay, Idaho and it is 83251. Area code: 208.

ZIP codes

1,124.15

sq mi land

2.97

sq mi water

208

area code

Mackay, ID ZIP code map

About Mackay, ID

Mackay, Idaho, is a charming small town nestled in the heart of Custer County. Known for its beautiful landscapes and outdoor recreational opportunities, Mackay serves as a gateway to the surrounding mountains and wilderness areas. Residents and visitors alike enjoy its close-knit community feel and the rich history that permeates the area.

Location & geography

Mackay is located in central Idaho and boasts a land area of 1,124.15 square miles, with a water area of 2.97 square miles. It is positioned approximately 30 miles northwest of the larger town of Idaho Falls, about 15 miles from Arco, and is surrounded by breathtaking natural terrains, including mountains and rivers. The local geography contributes to a variety of outdoor activities, such as fishing, hiking, and camping.

Community & economy

The character of Mackay is defined by its warm, friendly atmosphere and a strong sense of community pride. The town has a diverse economy, with key industries including agriculture, tourism, and recreational activities. Daily life in Mackay is marked by a mix of small-town charm and access to nature, making it an ideal place for families and outdoor enthusiasts.

Transportation

Mackay is accessible via State Highway 93, which connects it to nearby cities and towns. The nearest major airport is Idaho Falls Regional Airport, located about 30 miles away, which serves as the primary access point for air travel in the region. Local transportation options are limited, but the town's size makes it easy to navigate by car or bike.

History

Mackay was founded in the late 19th century during the mining boom in Idaho, initially attracting prospectors and settlers seeking fortune. Key industries historically included silver mining, agriculture, and later tourism as the area's natural beauty garnered attention. Notable events in its past include the establishment of local schools and the development of community infrastructure to support its growing population.

Did you know?

One surprising fact about Mackay is that it is located near the historic mine known as the Silver King Mine, which played a significant role in the town's economic development. Additionally, Mackay is known for its exceptional trout fishing opportunities, drawing anglers to the area's rivers and streams.

ZIP codes for Mackay, ID (1)

ZIP code	City	County	Map
83251	Mackay	Custer	View map

Demographics & statistics

1,286

Population

57.5

Median age

$67,553

Median household income

$33,920

Per capita income

$301,500

Median home value

$979

Median monthly rent

85.8%

Home ownership

10.7%

Poverty rate

5.4%

Unemployment

844

Housing units

30.3%

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

105

60–64

112

105

65–74

113

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	164	12.8%
18 and over	1,122	87.2%
65 and over	350	27.2%
Median age	57.5 years

Race & ethnicity

White 83.5%

Two or more races 13.6%

Hispanic or Latino 2.6%

American Indian / Alaska Native 0.2%

Other race 0.2%

Group	Count	%
White	1,102	83.5%
Two or more races	179	13.6%
Hispanic or Latino	34	2.6%
American Indian / Alaska Native	3	0.2%
Other race	2	0.2%

Household income

Under $10k 4.0%

$10k–$15k 1.6%

$15k–$25k 11.1%

$25k–$35k 11.5%

$35k–$50k 9.7%

$50k–$75k 22.6%

$75k–$100k 14.9%

$100k–$150k 7.5%

$150k–$200k 12.8%

$200k+ 4.3%

Range	% of households
Under $10k	4.0%
$10k–$15k	1.6%
$15k–$25k	11.1%
$25k–$35k	11.5%
$35k–$50k	9.7%
$50k–$75k	22.6%
$75k–$100k	14.9%
$100k–$150k	7.5%
$150k–$200k	12.8%
$200k+	4.3%
Median income	$67,553

Housing

Home values

Under $50k 6.3%

$50k–$100k 1.6%

$100k–$150k 11.1%

$150k–$200k 11.1%

$200k–$300k 19.4%

$300k–$500k 32.0%

$500k–$1M 12.6%

$1M+ 5.9%

Housing overview

Metric	Value
Median home value	$301,500
Median rent / month	$979
Owner occupied	85.8%
Renter occupied	14.2%
Vacant	37.8%
Single-family detached	90.9%
Large apartment buildings	0.0%
Mobile homes	6.8%
Median rooms	5.8
Avg household size (owned)	2.12

Year built

Era	%
2020 or later	0.0%
2010–2019	3.1%
2000–2009	21.2%
1990–1999	17.3%
1980–1989	15.0%
1970–1979	16.3%
1960–1969	4.9%
1950–1959	4.6%
1940–1949	1.9%
1939 or earlier	15.7%

Bedrooms

Size	% of units
No bedroom (studio)	2.3%
1 bedroom	9.1%
2 bedrooms	22.1%
3 bedrooms	41.3%
4 bedrooms	16.7%
5+ bedrooms	8.5%

Vehicles per household

Vehicles	% of households
No vehicle	1.6%
1 vehicle	13.5%
2 vehicles	35.9%
3 or more	49.0%

Heating fuel

Fuel type	%
Utility gas	1.9%
Electricity	61.5%
Propane / LP gas	9.0%
Fuel oil	0.7%
Wood	25.0%
No fuel used	1.4%

Households & families

Household type	Count	%
Married-couple family	369	64.1%
Cohabiting couple	12	2.1%
Male householder, no spouse	85	14.8%
Female householder, no spouse	110	19.1%
Households with children under 18	57	9.9%
Households with seniors (65+)	252	43.8%
Average household size	2.19

Marital status

Status	Male	Female
Never married	17.1%	13.6%
Married	62.5%	62.1%
Separated	0.0%	3.7%
Widowed	1.4%	14.2%
Divorced	19.0%	6.5%

Education

Less than 9th grade 0.0%

Some HS, no diploma 4.8%

HS graduate 36.5%

Some college, no degree 20.1%

Associate's degree 8.3%

Bachelor's degree 17.0%

Graduate / professional 13.3%

Metric	%
HS diploma or higher	95.2%
Bachelor's or higher	30.3%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	58	33.1%
Kindergarten	0	0.0%
Elementary school	61	34.9%
High school	14	8.0%
College / grad school	42	24.0%

Employment

Industry of employment

Education & healthcare 25.3%

Professional & management 16.3%

Agriculture & mining 15.5%

Construction 11.5%

Transportation & utilities 8.3%

Finance & real estate 8.3%

Information 3.5%

Manufacturing 2.8%

Retail trade 2.8%

Public administration 2.8%

Arts, food & hospitality 1.3%

Wholesale trade 1.0%

Other services 1.0%

Occupation

Category	%
Management, business & arts	46.3%
Service	18.0%
Sales & office	18.0%
Natural resources & construction	13.5%
Production & transportation	4.3%

Employment type

Type	%
Private sector	53.8%
Government	31.0%
Self-employed	15.3%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	58.7%
Carpool	13.0%
Public transit	6.0%
Walk	3.9%
Other means	8.3%
Avg commute (minutes)	19.1

Poverty

All people 10.7%

Under 18 years 4.9%

18 and over 11.6%

Married-couple families 6.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	52.8%
Retirement income	42.5%
Supplemental Security	5.2%
Cash public assistance	2.6%
Food stamps / SNAP	2.3%

Health indicators

Condition	%
High blood pressure	37.9%
High cholesterol	37.4%
Heart disease	9.0%
Stroke	4.1%
Asthma	9.7%
Arthritis	29.5%
Kidney disease	3.7%
Pulmonary disease	8.7%
Cancer	8.3%

Behavior / access	%
Binge drinking	13.5%
No physical activity	23.4%
Less than 7 hrs sleep	29.5%
Fair or poor health	16.4%
Poor mental health	12.9%
Poor physical health	12.6%
No health insurance	15.0%
Visited doctor (checkup)	71.8%
Visited dentist	57.6%
Cholesterol screening	89.2%
Teeth loss	15.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	57	5.1%

Disability	%
Any disability	21.9%
Under 18	0.0%
18–64 years	17.7%
65 and over	41.4%

Health insurance coverage

Type	%
Private insurance	75.0%
Public insurance	41.8%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	1,215	94.5%
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)	1,282	99.7%
Born in same state	1,278	99.4%
Born in different state	675	52.5%
Foreign born	4	0.3%
Naturalized citizen	4	0.3%
Not a US citizen	3	75.0%

Ancestry

Ancestry	Count	%
French	387	30.1%
Italian	137	10.7%
English	59	4.6%

Ancestry	Count	%
Arab	44	3.4%
Polish	32	2.5%
Irish	1	0.1%

Technology access

Metric	% of households
Computer access	44.8%
Internet access	86.6%

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

Frequently asked questions

What is the ZIP code for Mackay, ID?

Mackay, ID has one ZIP code: 83251.

What is the main ZIP code for Mackay, ID?

The primary ZIP code for Mackay, ID is 83251. The city uses area code 208 for phone service.

What county is Mackay, ID in?

Mackay is located in Custer County, Idaho.

How many ZIP codes are in Mackay, ID?

Mackay, ID has 1 ZIP code.

What ZIP code should I use when mailing a letter to a business in downtown Mackay, Idaho?

Downtown Mackay businesses use the ZIP code 83251, which serves the entire city and surrounding Custer County area.

If I'm sending a package to someone living in Mackay near the Lost River Valley area, what ZIP code would I need?

You would use ZIP code 83251, as this is the only ZIP code that covers Mackay and includes all residential areas throughout the city and surrounding valley region.