ZIP Code 36603 — Mobile, AL
36603 is a standard (street delivery) ZIP code serving Mobile, Alabama, in Mobile 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 36603 at a glance
| ZIP code | 36603 |
|---|---|
| Primary city | Mobile |
| State | Alabama (AL) |
| County | Mobile FIPS 01097 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 7,760 |
| Coordinates | 30.684260, -88.052730 |
How ZIP+4 works in 36603
The four digits after the hyphen encode a delivery segment inside 36603. 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 36603 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 Mobile
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 36603.
| ZIP | City | Distance |
|---|---|---|
| 36604 | Mobile, AL | 0.9 mi |
| 36602 | Mobile, AL | 1.3 mi |
| 36652 | Mobile, AL | 1.8 mi |
| 36606 | Mobile, AL | 3.3 mi |
| 36607 | Mobile, AL | 3.3 mi |
| 36617 | Mobile, AL | 3.3 mi |
| 36615 | Mobile, AL | 3.5 mi |
| 36610 | Mobile, AL | 3.9 mi |
| 36663 | Mobile, AL | 4.9 mi |
| 36605 | Mobile, AL | 5.8 mi |
| 36612 | Mobile, AL | 5.9 mi |
| 36611 | Mobile, AL | 6.1 mi |
Questions about 36603
What is the ZIP+4 code for 36603?
36603 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 36603, you need to look up a specific street address to get them.
What city is 36603?
36603 is assigned to Mobile, Alabama, in Mobile 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.