ZIP code · Franklin Grove · Illinois · United States
ZIP code 61031 — Franklin Grove
ZIP code 61031 serves Franklin Grove, Illinois.
- Postal code
- 61031Single source Value from one source, not cross-checked.
- City
- Franklin Grove
- County
- Lee FIPS 17103
- State
- Illinois
- Country
- United States
- Coordinates
- 41.8580, -89.3171 — precision precise (locality)
View on OpenStreetMap - Population
- 1,615 (ZCTA, ACS 5-year)
- Population density
- 36 / sq mi
- Land area
- 44.9 sq mi (116.4 km²) (ZCTA, ACS 5-year)
- Median household income
- $74,050
- Per-capita income
- $32,426
- Median age
- 44.1
- Households
- 603
- Housing units
- 654
- Median home value
- $148,600
- Median gross rent
- $822 / month
- Congressional district
- IL-16 (119th Congress)
- USDA hardiness zone
- 5b (-15 to -10 °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 61031 with another ZIP · ZIPs within 25 miles · distance from 61031
Map of ZIP code 61031
Climate — monthly normals
Warmest month Jul (avg high 83°F), coldest Jan (avg low 14°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 29 | 34 | 46 | 60 | 71 | 80 | 83 | 81 | 75 | 63 | 48 | 35 |
| Avg low °F | 14 | 17 | 28 | 39 | 51 | 61 | 64 | 62 | 54 | 42 | 31 | 20 |
| Precip in | 2.0 | 1.8 | 2.6 | 4.0 | 4.8 | 5.6 | 4.3 | 4.2 | 3.7 | 3.0 | 2.4 | 2.2 |
NOAA 1991–2020 climate normals from the nearest station: DIXON 1W (10.3 mi) · NOAA NCEI
Places in ZIP 61031
- 2 schools
- 1 restaurants & cafés
- 1 bars & pubs
- 1 parks
- 2 playgrounds
- 1 libraries
- 1 post offices
- 4 places of worship
- 1 gas stations
- 1 police & fire stations
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