ZIP code · Chester · Idaho · United States
ZIP code 83421 — Chester
ZIP code 83421 serves Chester, Idaho.
- Postal code
- 83421Single source Value from one source, not cross-checked.
- City
- Chester
- County
- Fremont FIPS 16043
- State
- Idaho
- Country
- United States
- Coordinates
- 44.0011, -111.5351 — precision precise (locality)
View on OpenStreetMap - Population
- 346 (ZCTA, ACS 5-year)
- Population density
- 30 / sq mi
- Land area
- 11.7 sq mi (30.3 km²) (ZCTA, ACS 5-year)
- Median household income
- $80,438
- Per-capita income
- $66,294
- Median age
- 44
- Households
- 158
- Housing units
- 192
- Median home value
- $264,200
- Congressional district
- ID-2 (119th Congress)
- USDA hardiness zone
- 5a (-20 to -15 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Boise (UTC−7 / UTC−6 DST)
Tools: compare 83421 with another ZIP · ZIPs within 25 miles · distance from 83421
Map of ZIP code 83421
Climate — monthly normals
Warmest month Aug (avg high 83°F), coldest Jan (avg low 13°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 29 | 33 | 42 | 54 | 65 | 73 | 83 | 83 | 73 | 57 | 40 | 29 |
| Avg low °F | 13 | 17 | 25 | 31 | 40 | 46 | 51 | 49 | 42 | 32 | 23 | 15 |
| Precip in | 2.3 | 1.5 | 1.3 | 1.7 | 2.2 | 2.1 | 0.6 | 0.8 | 1.2 | 1.6 | 1.9 | 2.3 |
NOAA 1991–2020 climate normals from the nearest station: ASHTON 1N (6.2 mi) · NOAA NCEI
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page