Residential delivery area · Montana
ZIP Code 59866: Saint Regis, MT
ZIP code 59866 uses the postal name Saint Regis, Montana and lies mostly in Mineral County (91% of its land) with the rest in Sanders County (Census 2020 ZIP-county file). About 1,200 people live there (Census Bureau, ACS 2020-2024). Median household income is $73,462 (Census Bureau, ACS 2020-2024). By Census place, under 1% of its land lies in St. Regis (a census-designated place); more than 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2021
- ZBP2023
- IRS2022
- Town
- Saint Regis · its only residential ZIP
- County
- Mineral County (91%); Sanders County (9%)
- Census places
- St. Regis census-designated place
- Metro area
- Missoula, MT
- House district
- MT-1 119th Congress
- State
- Montana
- Time zone
- Mountain
- Land area
- 222.4 sq mi · 5 people per sq mi
Where is ZIP code 59866?
59866 centers on 47.343°, -115.120° and covers 222.4 square miles of land plus 1.2 of water. It borders 6 ZIP codes: 59842, 59830, 59872, 59859, 59873, 59846.
The map draws ZIP code areas only. For the streets inside 59866, 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 59866 compare with the rest of Mineral County?
| Measure | 59866 | In Mineral County | In MT |
|---|---|---|---|
| People (ACS 2020-2024) | 1,161 | 3rd of 6 | 125th of 369 |
| Median household income | $74k | not ranked | not ranked |
| Median home value | $344k | 3rd of 3 | 62nd of 120 |
59866's median household income is not ranked: its 90% margin of error (±$21,265) is more than a quarter of the figure ($73,462). Rankings use ZIP codes of 1,000 or more people living in households, with margins at most 25% of the figure.
It is denser than 11% of 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 59866?
The 2020 Census counted 1,019 people in 59866; the ACS, which samples households over 2020-2024, estimates 1,161. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 1,161±270 (90% margin)
- 2020 Census count
- 1,019
- Households
- 554
- Median age
- 49.3
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 59866?
Of the 1,161 people the ACS estimates in 59866, 20.8% are under 18 and 32.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (86.7%).
- Under 1820.8%
- 18 to 6446.9%
- 65 and older32.4%
- White, not Hispanic86.7%
- Other or two or more9.4%
- Hispanic or Latino3.8%
- Black, not Hispanic0.1%
- Asian, 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 59866 earn?
Median household income is $73,462 (ACS 2020-2024).
- Median household income
- $73,462±$21,265
- Income per person
- $44,935
- Below the poverty line
- 9.5%
- Unemployed (of the labor force)
- 4.9%
- Adults 25+ with a bachelor's degree
- 40.4%
- Adjusted gross income per tax return, 2022
- $56,008510 returns; wages 56% 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 59866?
- Median home value (owners' estimate)
- $343,700
- Median gross rent
- $888
- Homes owned by their occupants
- 81.9%
- Housing units
- 736
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 59866?
36 business establishments had a location in this ZIP code in 2023, 5 more than in 2018; the most are in accommodation and food services (ZIP Code Business Patterns).
- Accommodation and food services9
- Construction5
- Retail trade5
- Arts, entertainment, and recreation3
- Other services (except public administration)3
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 59866?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 59842 | Haugan | 46 | – | 14.9 mi |
| 59830 | De Borgia | 102 | – | 17.0 mi |
| 59872 | Superior | 2,501 | $56k | 19.2 mi |
| 59859 | Plains | 4,360 | $65k | 19.5 mi |
| 59873 | Thompson Falls | 2,920 | $60k | 23.2 mi |
| 59846 | Huson | 1,377 | $71k | 31.4 mi |
| 59856 | Paradise | 130 | – | 18.1 mi (near) |
| 59867 | Saltese | 85 | – | 21.0 mi (near) |
| 83802 | Avery, ID | 124 | $79k | 23.8 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.