| ZIP Codes: | 7 ZIP Codes (6 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:01 PM |
| Population: | 17,907 [See All] |
| FIPS: | 17083 |
| CBSA: | St. Louis, MO-IL |
| Land Area: | 345 sq mi |
| Water Area: | 6 sq mi |
| Coordinates: | 39.0734, -90.3288 |
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17,907 residents live across 7 ZIPs covering 345 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 19,621 to 17,907 from 2014 to 2024 — a -8.7% change. 1 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 62022 (Dow, $110,703 median) and poorest ZIP 62063 (Medora, $63,295) are 17.6 miles apart — a 1.7× income gap across local geography.
Median home values vary 1.9× across this county — from $118,800 in 62031 (Fieldon) to $228,500 in 62037 (Grafton).
Density varies 30× across the county — from 8 people/sq mi in 62031 (Fieldon) to 244 in 62028 (Elsah).
Educational attainment ranges from 13.2% bachelor's+ in 62063 (Medora) to 53.0% in 62028 (Elsah) — the breadth of educational profiles across the area.
Within Illinois, this is the #58 most populous of 102 counties and ranks #45 for median household income .
Weighted by population, the typical household earns about $76,361 across the county — reflecting what a typical resident sees, not a simple ZIP average.
22.7% of adults age 25+ hold a bachelor's degree or higher (2,850 of 12,579 reporting).
6 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Jersey County lost 8.7% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 62052 | Jerseyville | Standard | 12,237 | $74,926 | 138.2 | -8.2% |
| 62037 | Grafton | Standard | 1,814 | $73,454 | 61.4 | -8.0% |
| 62028 | Elsah | Standard | 1,385 | $72,031 | 5.7 | -0.1% |
| 62022 | Dow | Standard | 1,088 | $110,703 | 21.6 | 18.8% |
| 62063 | Medora | Standard | 795 | $63,295 | 53.9 | -25.1% |
| 62031 | Fieldon | Standard | 517 | $84,375 | 64.3 | -37.2% |
| 62030 | Fidelity | PO Box | 71 | $44,063 | 0.0 | -49.3% |