ZIP Code 34145 — Marco Island, FL
34145 is a standard (street delivery) ZIP code serving Marco Island, Florida, in Collier 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 34145 at a glance
| ZIP code | 34145 |
|---|---|
| Primary city | Marco Island |
| State | Florida (FL) |
| County | Collier FIPS 12021 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 16,205 |
| Coordinates | 25.919030, -81.695060 |
How ZIP+4 works in 34145
The four digits after the hyphen encode a delivery segment inside 34145. 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 34145 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 34145.
| ZIP | City | Distance |
|---|---|---|
| 34140 | Goodland, FL | 2.3 mi |
| 34114 | Naples, FL | 8.4 mi |
| 34113 | Naples, FL | 9.8 mi |
| 34101 | Naples, FL | 10.9 mi |
| 34112 | Naples, FL | 14.2 mi |
| 34102 | Naples, FL | 16.4 mi |
| 34104 | Naples, FL | 16.4 mi |
| 34117 | Naples, FL | 16.5 mi |
| 34116 | Naples, FL | 18.6 mi |
| 34105 | Naples, FL | 19.1 mi |
| 34137 | Copeland, FL | 19.6 mi |
| 34139 | Everglades City, FL | 19.9 mi |
Questions about 34145
What is the ZIP+4 code for 34145?
34145 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 34145, you need to look up a specific street address to get them.
What city is 34145?
34145 is assigned to Marco Island, Florida, in Collier 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.