ZIP code · Potomac · Illinois · United States
ZIP code 61865 — Potomac
ZIP code 61865 serves Potomac, Illinois.
- Postal code
- 61865Single source Value from one source, not cross-checked.
- City
- Potomac
- County
- Vermilion FIPS 17183
- State
- Illinois
- Country
- United States
- Coordinates
- 40.3090, -87.8232 — precision precise (locality)
View on OpenStreetMap - Population
- 1,161 (ZCTA, ACS 5-year)
- Population density
- 15 / sq mi
- Land area
- 79.7 sq mi (206.5 km²) (ZCTA, ACS 5-year)
- Median household income
- $71,827
- Per-capita income
- $37,108
- Median age
- 42.1
- Households
- 459
- Housing units
- 506
- Median home value
- $101,900
- Median gross rent
- $765 / month
- 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 61865 with another ZIP · ZIPs within 25 miles · distance from 61865
Map of ZIP code 61865
Climate — monthly normals
Warmest month Jul (avg high 85°F), coldest Jan (avg low 18°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 38 | 50 | 64 | 74 | 83 | 85 | 83 | 79 | 66 | 50 | 38 |
| Avg low °F | 18 | 22 | 31 | 41 | 53 | 62 | 65 | 63 | 55 | 44 | 33 | 24 |
| Precip in | 2.1 | 2.0 | 2.8 | 4.0 | 4.8 | 4.9 | 4.6 | 4.0 | 3.4 | 3.4 | 2.9 | 2.1 |
NOAA 1991–2020 climate normals from the nearest station: HOOPESTON (13.1 mi) · NOAA NCEI
Places in ZIP 61865
- 3 schools
- 2 parks
- 4 playgrounds
- 1 libraries
- 3 places of worship
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