ZIP code · Cooksville · Illinois · United States

ZIP code 61730 — Cooksville

ZIP code 61730 serves Cooksville, Illinois.

Postal code: 61730
Single source Value from one source, not cross-checked.
City: Cooksville
County: McLean FIPS 17113
State: Illinois
Country: United States
Coordinates: 40.5360, -88.7350 — precision precise (locality)
View on OpenStreetMap
Population: 431 (ZCTA, ACS 5-year)
Population density: 15 / sq mi
Land area: 29 sq mi (75 km²) (ZCTA, ACS 5-year)
Median household income: $66,042
Per-capita income: $28,829
Median age: 35.4
Households: 147
Housing units: 161
Median home value: $159,100
Median gross rent: $925 / month
Congressional district: IL-16 (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)
Area code: 309
Telephone 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 61730 with another ZIP · ZIPs within 25 miles · distance from 61730

Climate — monthly normals

Warmest month Jul (avg high 86°F), coldest Jan (avg low 16°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	33	38	50	63	74	83	86	84	79	66	50	38
Avg low °F	16	19	28	38	50	60	63	61	53	42	31	21
Precip in	2.4	2.0	2.6	3.7	4.8	4.1	4.1	3.8	3.2	3.5	2.8	2.3

NOAA 1991–2020 climate normals from the nearest station: NORMAL 4NE (11.3 mi) · NOAA NCEI

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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

Map of ZIP code 61730

Climate — monthly normals

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