ZIP Code 33042 — Summerland Key, FL
33042 is a standard (street delivery) ZIP code serving Summerland Key, Florida, in Monroe 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 33042 at a glance
| ZIP code | 33042 |
|---|---|
| Primary city | Summerland Key |
| State | Florida (FL) |
| County | Monroe FIPS 12087 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 6,441 |
| Coordinates | 24.674810, -81.507170 |
How ZIP+4 works in 33042
The four digits after the hyphen encode a delivery segment inside 33042. 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 33042 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 33042.
| ZIP | City | Distance |
|---|---|---|
| 33043 | Big Pine Key, FL | 9.5 mi |
| 33040 | Key West, FL | 16.4 mi |
| 33050 | Marathon, FL | 29.9 mi |
| 33051 | Key Colony Beach, FL | 30.6 mi |
Questions about 33042
What is the ZIP+4 code for 33042?
33042 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 33042, you need to look up a specific street address to get them.
What city is 33042?
33042 is assigned to Summerland Key, Florida, in Monroe 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.