ZIP code · Flat Rock · Illinois · United States
ZIP code 62427 — Flat Rock
ZIP code 62427 serves Flat Rock, Illinois.
- Postal code
- 62427Single source Value from one source, not cross-checked.
- City
- Flat Rock
- County
- Crawford FIPS 17033
- State
- Illinois
- Country
- United States
- Coordinates
- 38.9096, -87.6837 — precision precise (locality)
View on OpenStreetMap - Population
- 1,905 (ZCTA, ACS 5-year)
- Population density
- 23 / sq mi
- Land area
- 84.2 sq mi (218.1 km²) (ZCTA, ACS 5-year)
- Median household income
- $74,167
- Per-capita income
- $32,424
- Median age
- 40.8
- Households
- 734
- Housing units
- 778
- Median home value
- $105,400
- Congressional district
- IL-12 (119th Congress)
- USDA hardiness zone
- 6b (-5 to 0 °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)
- Area code
- 618Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 62427 with another ZIP · ZIPs within 25 miles · distance from 62427
Map of ZIP code 62427
Climate — monthly normals
Warmest month Jul (avg high 87°F), coldest Jan (avg low 23°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 38 | 44 | 54 | 67 | 76 | 84 | 87 | 86 | 80 | 68 | 54 | 42 |
| Avg low °F | 23 | 26 | 35 | 45 | 55 | 63 | 66 | 64 | 56 | 46 | 35 | 28 |
| Precip in | 3.5 | 2.6 | 3.6 | 5.1 | 4.9 | 4.9 | 4.2 | 3.5 | 3.6 | 3.7 | 3.6 | 3.1 |
NOAA 1991–2020 climate normals from the nearest station: PALESTINE (7.5 mi) · NOAA NCEI
Places in ZIP 62427
- 1 parks
- 1 playgrounds
- 1 libraries
- 6 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