| ZIP Codes: | 27 ZIP Codes (20 Standard, 6 PO Box, 1 Unique) [See All] |
| Area Codes: | 224 / 331 / 630 / 815 / 847 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:01 PM |
| Population: | 506,642 [See All] |
| FIPS: | 17089 |
| CBSA: | Chicago-Naperville-Elgin, IL-IN |
| Land Area: | 521 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 41.9202, -88.3764 |
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506,642 residents live across 27 ZIPs covering 521 sq mi, served by 20 distinct USPS-recognized cities.
Population moved from 511,751 to 506,619 from 2014 to 2024 — a -1.0% change. 11 ZIPs gained residents, 11 lost.
The county's wealthiest ZIP 60175 (Saint Charles, $181,352 median) and poorest ZIP 60505 (Aurora, $73,284) are 12.6 miles apart — a 2.5× income gap across local geography.
Median home values vary 2.5× across this county — from $205,100 in 60505 (Aurora) to $519,700 in 60175 (Saint Charles).
Density varies 130× across the county — from 43 people/sq mi in 60151 (Maple Park) to 5,516 in 60505 (Aurora).
Educational attainment ranges from 14.2% bachelor's+ in 60505 (Aurora) to 65.3% in 60134 (Geneva) — the breadth of educational profiles across the area.
Within Illinois, this is the #5 most populous of 102 counties and ranks #3 for median household income .
Hosts 1 single-entity Unique ZIP: 60568Northern Ill Gas Co .
Weighted by population, the typical household earns about $106,692 across the county — reflecting what a typical resident sees, not a simple ZIP average.
37.0% of adults age 25+ hold a bachelor's degree or higher (124,626 of 337,117 reporting).
20 Standard delivery, 6 PO Box only, 1 single-entity Unique ZIPs serve this county.
1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 60505 | Aurora | Standard | 57,199 | $73,284 | 10.4 | -23.3% |
| 60120 | Elgin | Standard | 51,225 | $82,449 | 13.3 | 2.1% |
| 60506 | Aurora | Standard | 50,038 | $79,517 | 20.7 | -11.3% |
| 60123 | Elgin | Standard | 48,379 | $87,693 | 15.0 | -1.4% |
| 60110 | Carpentersville | Standard | 38,558 | $87,906 | 10.0 | -1.6% |
| 60174 | Saint Charles | Standard | 31,402 | $104,534 | 16.4 | -0.1% |
| 60134 | Geneva | Standard | 29,743 | $152,727 | 14.6 | 1.5% |
| 60510 | Batavia | Standard | 29,038 | $121,622 | 22.9 | -0.3% |
| 60175 | Saint Charles | Standard | 25,553 | $181,352 | 33.3 | -2.0% |
| 60124 | Elgin | Standard | 24,487 | $139,982 | 37.6 | 19.8% |
| 60177 | South Elgin | Standard | 24,416 | $126,144 | 10.3 | 7.0% |
| 60140 | Hampshire | Standard | 22,689 | $111,241 | 79.7 | 56.4% |
| 60542 | North Aurora | Standard | 18,932 | $114,831 | 9.1 | 10.7% |
| 60118 | Dundee | Standard | 15,892 | $106,912 | 16.9 | 2.9% |
| 60554 | Sugar Grove | Standard | 12,081 | $122,734 | 33.3 | 3.3% |
| 60119 | Elburn | Standard | 11,381 | $130,722 | 39.4 | 9.6% |
| 60136 | Gilberts | Standard | 8,777 | $147,704 | 7.5 | 20.6% |
| 60151 | Maple Park | Standard | 3,888 | $117,450 | 91.4 | -10.3% |
| 60511 | Big Rock | Standard | 2,081 | $158,625 | 34.0 | 36.0% |
| 60109 | Burlington | PO Box | 481 | $82,656 | 4.2 | -14.1% |
| 60539 | Mooseheart | Standard | 313 | — | 0.9 | -4.6% |
| 60144 | Kaneville | PO Box | 66 | $59,250 | 0.0 | -16.5% |
| 60183 | Wasco | PO Box | 23 | — | 0.3 | — |
| 60147 | Lafox | PO Box | — | — | 0.0 | — |
| 60507 | Aurora | PO Box | — | — | 0.0 | — |
| 60568 | Aurora | Unique | — | — | 0.0 | — |
| 60121 | Elgin | PO Box | — | — | 0.0 | — |