Mackay is a city in Custer County, Idaho, home to about 602 people across 0.9 square miles. Its ZIP code is 83251.
Homes sold for a median of $286 per square foot in the three months ending August 2026, a balanced market.
Each card is that ZIP code’s whole market, including any part outside Mackay. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Boise Air Terminal/Gowen Field (BOI)132 miles away |
|---|---|
| Closer regional airport | Friedman Memorial Airport (SUN)44 miles away |
| Nearest city of 250,000+ | Reno, NV441 miles away |
| Nearest city of 1 million+ | Phoenix, AZ719 miles away |
Straight-line distances from the center of Mackay; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Mackay had 439 residents in the 2020 census, down 22% since 2000.
It’s the 132nd largest of 232 towns in Idaho by population.
Custer County grew from 2,049 residents in 1900 to 4,275 in 2020.
Custer County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 83°F in summer, and winter lows average 8°F. About 10 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Mackay Lost Rvr Rs, ID weather station (about a mile away).
862 jobs at 192 businesses in Custer County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
1 doctors and other health care providers list an office in Mackay.
Nearest hospitals
Providers with an office here
| Mental health providers | 1 |
|---|
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (1 nearby)
Grocery stores (1 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Mackay Joint District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Mackay Elementary SchoolMackay | Pre-K–6 | 114 | Public | 0.3 mi |
| Mackay Jr./Sr. High SchoolMackay | 7–12 | 104 | Public | 0.2 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.