ZIP Code 04103 — Portland, ME
04103 is a standard (street delivery) ZIP code serving Portland, Maine, in Cumberland 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 04103 at a glance
| ZIP code | 04103 |
|---|---|
| Primary city | Portland |
| State | Maine (ME) |
| County | Cumberland FIPS 23005 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 32,024 |
| Coordinates | 43.693920, -70.290900 |
How ZIP+4 works in 04103
The four digits after the hyphen encode a delivery segment inside 04103. 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 04103 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.
Other ZIP codes in Portland
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 04103.
| ZIP | City | Distance |
|---|---|---|
| 04102 | Portland, ME | 2.5 mi |
| 04101 | Portland, ME | 2.7 mi |
| 04092 | Westbrook, ME | 3.1 mi |
| 04105 | Falmouth, ME | 3.7 mi |
| 04106 | South Portland, ME | 4.4 mi |
| 04109 | Portland, ME | 4.9 mi |
| 04108 | Peaks Island, ME | 5.6 mi |
| 04110 | Cumberland Foreside, ME | 6.4 mi |
| 04050 | Long Island, ME | 6.7 mi |
| 04021 | Cumberland Center, ME | 7.3 mi |
| 04107 | Cape Elizabeth, ME | 7.7 mi |
| 04074 | Scarborough, ME | 8.1 mi |
Questions about 04103
What is the ZIP+4 code for 04103?
04103 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 04103, you need to look up a specific street address to get them.
What city is 04103?
04103 is assigned to Portland, Maine, in Cumberland 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.