| ZIP Codes: | 8 ZIP Codes (6 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 331 / 630 / 779 / 815 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:01 PM |
| Population: | 121,968 [See All] |
| FIPS: | 17093 |
| CBSA: | Chicago-Naperville-Elgin, IL-IN |
| Land Area: | 265 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 41.6326, -88.4637 |
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121,968 residents live across 8 ZIPs covering 265 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 106,569 to 121,968 from 2014 to 2024 — a +14.4% change. 6 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 60543 (Oswego, $119,371 median) and poorest ZIP 60537 (Millington, $81,825) are 16.5 miles apart — a 1.5× income gap across local geography.
Median home values vary 1.5× across this county — from $230,200 in 60537 (Millington) to $352,200 in 60512 (Bristol).
Density varies 64× across the county — from 39 people/sq mi in 60541 (Newark) to 2,520 in 60538 (Montgomery).
Educational attainment ranges from 23.6% bachelor's+ in 60545 (Plano) to 42.7% in 60543 (Oswego) — the breadth of educational profiles across the area.
Within Illinois, this is the #16 most populous of 102 counties and ranks #7 for median household income with the #1 fastest decade growth .
Weighted by population, the typical household earns about $107,362 across the county — reflecting what a typical resident sees, not a simple ZIP average.
34.4% of adults age 25+ hold a bachelor's degree or higher (27,441 of 79,656 reporting).
6 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 60543 | Oswego | Standard | 43,047 | $119,371 | 41.7 | 14.0% |
| 60538 | Montgomery | Standard | 30,514 | $97,131 | 12.1 | 13.6% |
| 60560 | Yorkville | Standard | 28,795 | $110,326 | 82.1 | 27.4% |
| 60545 | Plano | Standard | 14,392 | $86,756 | 40.9 | 8.4% |
| 60541 | Newark | Standard | 3,342 | $118,100 | 85.4 | 1.4% |
| 60512 | Bristol | Standard | 1,090 | $96,895 | 2.1 | -45.5% |
| 60537 | Millington | PO Box | 726 | $81,825 | 0.8 | 9.5% |
| 60536 | Millbrook | PO Box | 62 | $115,625 | 0.1 | -44.1% |