ZIP Code 60042 — Island Lake, IL
60042 is a standard (street delivery) ZIP code serving Island Lake, Illinois, in Lake County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 60042 at a glance
| ZIP code | 60042 |
|---|---|
| Primary city | Island Lake |
| State | Illinois (IL) |
| County | Lake FIPS 17097 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 8,347 |
| Coordinates | 42.279130, -88.197770 |
How ZIP+4 works in 60042
The four digits after the hyphen encode a delivery segment inside 60042. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 60042 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 60042.
| ZIP | City | Distance |
|---|---|---|
| 60084 | Wauconda, IL | 3.1 mi |
| 60013 | Cary, IL | 4.5 mi |
| 60051 | Mchenry, IL | 5.1 mi |
| 60012 | Crystal Lake, IL | 5.8 mi |
| 60021 | Fox River Grove, IL | 5.9 mi |
| 60050 | Mchenry, IL | 6 mi |
| 60041 | Ingleside, IL | 6.6 mi |
| 60073 | Round Lake, IL | 6.9 mi |
| 60014 | Crystal Lake, IL | 7.4 mi |
| 60060 | Mundelein, IL | 8.1 mi |
| 60020 | Fox Lake, IL | 8.1 mi |
| 60030 | Grayslake, IL | 8.7 mi |
Questions about 60042
What is the ZIP+4 code for 60042?
60042 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 60042, you need to look up a specific street address to get them.
What city is 60042?
60042 is assigned to Island Lake, Illinois, in Lake County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.