ZIP Codes of Clinton County, IL

Population & People
Population & People
Total Population
33,329
Household Income
Household Income
Median Income
$83,304
Housing
Housing
Total Housing Units
14,587
Business & Economy
Business & Economy
Total Businesses
843
Employment
Employment
Employment Rate
64.96%
Education
Education
Bachelor's Degree+
28.22%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 13 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:13 ZIP Codes (10 Standard, 3 PO Box, 0 Unique) [See All]
Area Codes:618 / 730
Timezone:Central (GMT -06:00)
Local Time:2:11:59 PM
Population:33,329 [See All]
FIPS:17027
CBSA:St. Louis, MO-IL
Land Area:492 sq mi
Water Area:31 sq mi
Coordinates:38.5844, -89.4923
Quick Link:
https://www.zip-codes.com/county/il-clinton.asp
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Extreme geographic sprawl
The largest ZIP spans 464× the smallest by area — 210.5 sq mi down to 0.45.
Notable income spread
Median income ranges $47,000 to $120,139 across ZIPs — a 2.6× gap.
Striking education divide
Bachelor's share spans 7.0% to 38.1% — a 31-point gap.

Standout ZIPs in this County


Most Populous
Carlyle · 6,377 people
19.1% of county total
Highest Income
Aviston · $120,139 median
1.4× county average
Largest Land Area
Carlyle · 210.5 sq mi
Spans the most ground
Fastest Growth
Germantown · 19.6% (10-yr)
1,556 → 1,861 residents
Most Educated
Aviston · 38.1% bachelor's+
762 of 2,001 adults 25+

Things worth knowing about Clinton County


33,329 residents live across 13 ZIPs covering 492 sq mi, served by 13 distinct USPS-recognized cities.

Population moved from 33,334 to 33,329 from 2014 to 2024 — a 0.0% change. 9 ZIPs gained residents, 3 lost.

The county's wealthiest ZIP 62216 (Aviston, $120,139 median) and poorest ZIP 62253 (Keyesport, $47,000) are 19.1 miles apart — a 2.6× income gap across local geography.

Median home values vary 2.7× across this county — from $95,500 in 62253 (Keyesport) to $260,900 in 62216 (Aviston).

Density varies 61× across the county — from 26 people/sq mi in 62253 (Keyesport) to 1,559 in 62219 (Beckemeyer).

Educational attainment ranges from 7.0% bachelor's+ in 62253 (Keyesport) to 38.1% in 62216 (Aviston) — the breadth of educational profiles across the area.

Within Illinois, this is the #42 most populous of 102 counties and ranks #19 for median household income .

Weighted by population, the typical household earns about $91,052 across the county — reflecting what a typical resident sees, not a simple ZIP average.

28.2% of adults age 25+ hold a bachelor's degree or higher (6,578 of 23,307 reporting).

10 Standard delivery, 3 PO Box only, 0 single-entity Unique ZIPs serve this county.

All ZIP Codes in Clinton County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
62231CarlyleStandard6,377$84,214210.5-13.3%
62230BreeseStandard6,377$91,35049.92.0%
62265New BadenStandard4,555$84,85337.80.5%
62293TrentonStandard4,433$98,15554.0-5.2%
62216AvistonStandard3,156$120,13922.910.9%
62218BartelsoStandard2,018$91,25045.214.1%
62215AlbersStandard1,917$107,72711.58.7%
62245GermantownStandard1,861$91,76721.119.6%
62219BeckemeyerPO Box993$63,6030.63.8%
62253KeyesportStandard932$47,00036.526.5%
62250HoffmanStandard607$66,6670.510.2%
62266New MemphisPO Box103$52,9171.1-69.2%
62252HueyPO Box0.0

Adjacent & Nearby Counties