ZIP Code 33037 — Key Largo, FL
33037 is a standard (street delivery) ZIP code serving Key Largo, 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 33037 at a glance
| ZIP code | 33037 |
|---|---|
| Primary city | Key Largo |
| State | Florida (FL) |
| County | Monroe FIPS 12087 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 14,770 |
| Coordinates | 25.197790, -80.386340 |
How ZIP+4 works in 33037
The four digits after the hyphen encode a delivery segment inside 33037. 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 33037 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 33037.
| ZIP | City | Distance |
|---|---|---|
| 33035 | Homestead, FL | 15.5 mi |
| 33070 | Tavernier, FL | 15.7 mi |
| 33033 | Homestead, FL | 19.4 mi |
| 33039 | Homestead, FL | 20.7 mi |
| 33030 | Homestead, FL | 21.2 mi |
| 33032 | Homestead, FL | 22.9 mi |
| 33031 | Homestead, FL | 23.9 mi |
| 33036 | Islamorada, FL | 24.7 mi |
| 33190 | Miami, FL | 24.9 mi |
| 33170 | Miami, FL | 25.2 mi |
| 33189 | Miami, FL | 26.1 mi |
| 33187 | Miami, FL | 27 mi |
Questions about 33037
What is the ZIP+4 code for 33037?
33037 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 33037, you need to look up a specific street address to get them.
What city is 33037?
33037 is assigned to Key Largo, 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.