ZIP code · Armstrong · Illinois · United States
ZIP code 61812 — Armstrong
ZIP code 61812 serves Armstrong, Illinois.
- Postal code
- 61812Single source Value from one source, not cross-checked.
- City
- Armstrong
- County
- Vermilion FIPS 17183
- State
- Illinois
- Country
- United States
- Coordinates
- 40.2175, -87.8943 — precision precise (locality)
View on OpenStreetMap - Population
- 291 (ZCTA, ACS 5-year)
- Population density
- 13 / sq mi
- Land area
- 22 sq mi (56.9 km²) (ZCTA, ACS 5-year)
- Median household income
- $101,250
- Per-capita income
- $38,327
- Median age
- 40.3
- Households
- 102
- Housing units
- 115
- Median home value
- $143,800
- Congressional district
- IL-2 (119th Congress)
- USDA hardiness zone
- 6a (-10 to -5 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Chicago (UTC−6 / UTC−5 DST)
Tools: compare 61812 with another ZIP · ZIPs within 25 miles · distance from 61812
Map of ZIP code 61812
Climate — monthly normals
Warmest month Jul (avg high 84°F), coldest Jan (avg low 18°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 39 | 51 | 64 | 73 | 82 | 84 | 83 | 78 | 66 | 51 | 39 |
| Avg low °F | 18 | 22 | 30 | 41 | 52 | 62 | 65 | 63 | 56 | 44 | 32 | 24 |
| Precip in | 2.4 | 2.2 | 2.8 | 3.9 | 5.0 | 5.0 | 4.4 | 3.5 | 3.4 | 3.3 | 3.1 | 2.4 |
NOAA 1991–2020 climate normals from the nearest station: OGDEN (8.1 mi) · NOAA NCEI
Places in ZIP 61812
- 4 schools
- 1 post offices
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
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