Residential delivery area · Idaho
ZIP Code 83251: Mackay, ID
ZIP code 83251 uses the postal name Mackay, Idaho and lies entirely in Custer County (Census 2020 ZIP-county file). About 1,400 people live there (Census Bureau, ACS 2020-2024). Median household income is $73,482 (Census Bureau, ACS 2020-2024). By Census place, under 1% of its land lies in Mackay; more than 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Mackay · its only residential ZIP
- County
- Custer County
- Census places
- Mackay
- House district
- ID-2 119th Congress
- State
- Idaho
- Time zone
- Mountain
- Land area
- 1,124.2 sq mi · 1 person per sq mi
Where is ZIP code 83251?
83251 centers on 43.945°, -113.945° and covers 1,124.2 square miles of land plus 3.0 of water. It borders 7 ZIP codes: 83255, 83226, 83333, 83340, 83320, 83213, 83244.
The map draws ZIP code areas only. For the streets inside 83251, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 83251 compare with the rest of Custer County?
| Measure | 83251 | In Custer County | In ID |
|---|---|---|---|
| People (ACS 2020-2024) | 1,443 | 2nd of 7 | 136th of 279 |
| Median household income | $74k | 1st of 2 | 61st of 126 |
| Median home value | $367k | 1st of 2 | 67th of 138 |
Its median household income is higher than in 52% of U.S. residential ZIP codes, and it is denser than 5% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 83251?
The 2020 Census counted 1,100 people in 83251; the ACS, which samples households over 2020-2024, estimates 1,443. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 1,443±335 (90% margin)
- 2020 Census count
- 1,100
- Households
- 603
- Median age
- 60.6
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 83251?
Of the 1,443 people the ACS estimates in 83251, 15.8% are under 18 and 34.0% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (90.1%).
- Under 1815.8%
- 18 to 6450.2%
- 65 and older34.0%
- White, not Hispanic90.1%
- Other or two or more4.6%
- Hispanic or Latino4.4%
- Asian, not Hispanic0.9%
- Black, not Hispanic0.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 83251 earn?
Median household income is $73,482 (ACS 2020-2024).
- Median household income
- $73,482±$10,352
- Income per person
- $39,453
- Below the poverty line
- 17.8%
- Unemployed (of the labor force)
- 6.0%
- Adults 25+ with a bachelor's degree
- 31.8%
- Adjusted gross income per tax return, 2022
- $67,607560 returns; wages 57% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 83251?
FHFA's house price index for 83251, built from repeat sales and appraisals of the same homes, rose 104% from 2015 to 2025 and rose 28% from 2020 to 2025.
- Median home value (owners' estimate)
- $366,900
- Median gross rent
- –
- Homes owned by their occupants
- 79.3%
- Housing units
- 942
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 83251?
41 business establishments had a location in this ZIP code in 2023, 1 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction8
- Retail trade7
- Accommodation and food services6
- Health care and social assistance4
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 83251?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 83255 | Moore | 1,222 | $71k | 29.1 mi |
| 83226 | Challis | 2,100 | $37k | 29.7 mi |
| 83333 | Hailey | 12,682 | $100k | 29.7 mi |
| 83340 | Ketchum | 5,325 | $94k | 34.9 mi |
| 83320 | Carey | 1,600 | $58k | 37.4 mi |
| 83213 | Arco | 1,349 | $44k | 45.1 mi |
| 83244 | Howe | 386 | – | 49.5 mi |
| 83353 | Sun Valley | 1,450 | $127k | 25.8 mi (near) |
| 83354 | Sun Valley | 10 | – | 26.7 mi (near) |
| 83227 | Clayton | 200 | – | 31.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.