| ZIP Codes: | 12 ZIP Codes (11 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:01 PM |
| Population: | 35,644 [See All] |
| FIPS: | 17081 |
| CBSA: | Mount Vernon, IL |
| Land Area: | 565 sq mi |
| Water Area: | 13 sq mi |
| Coordinates: | 38.2785, -88.9070 |
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35,644 residents live across 12 ZIPs covering 565 sq mi, served by 12 distinct USPS-recognized cities.
Population moved from 38,469 to 35,644 from 2014 to 2024 — a -7.3% change. 3 ZIPs gained residents, 8 lost.
The county's wealthiest ZIP 62883 (Scheller, $104,808 median) and poorest ZIP 62816 (Bonnie, $53,036) are 11.4 miles apart — a 2.0× income gap across local geography.
Median home values vary 1.9× across this county — from $86,600 in 62816 (Bonnie) to $164,400 in 62883 (Scheller).
Density varies 9× across the county — from 16 people/sq mi in 62883 (Scheller) to 156 in 62864 (Mount Vernon).
Educational attainment ranges from 4.4% bachelor's+ in 62846 (Ina) to 30.0% in 62894 (Waltonville) — the breadth of educational profiles across the area.
Within Illinois, this is the #38 most populous of 102 counties and ranks #65 for median household income .
Weighted by population, the typical household earns about $62,910 across the county — reflecting what a typical resident sees, not a simple ZIP average.
18.4% of adults age 25+ hold a bachelor's degree or higher (4,604 of 25,078 reporting).
11 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Jefferson County lost 7.3% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 62864 | Mount Vernon | Standard | 22,779 | $60,451 | 146.3 | -5.4% |
| 62898 | Woodlawn | Standard | 1,968 | $74,297 | 54.1 | -5.8% |
| 62846 | Ina | Standard | 1,798 | $65,500 | 21.0 | -29.2% |
| 62814 | Bluford | Standard | 1,668 | $59,462 | 68.0 | -15.2% |
| 62830 | Dix | Standard | 1,416 | $62,400 | 29.7 | 2.0% |
| 62810 | Belle Rive | Standard | 1,188 | $57,969 | 64.3 | 19.8% |
| 62872 | Opdyke | Standard | 1,153 | $62,344 | 23.1 | -8.8% |
| 62816 | Bonnie | Standard | 1,133 | $53,036 | 39.9 | -20.8% |
| 62889 | Texico | Standard | 1,066 | $70,364 | 31.5 | 6.0% |
| 62894 | Waltonville | Standard | 782 | $83,563 | 45.4 | -14.3% |
| 62883 | Scheller | Standard | 693 | $104,808 | 42.2 | -14.8% |
| 62866 | Nason | PO Box | — | — | 0.0 | — |