ZIP Code 37403 — Chattanooga, TN
37403 is a standard (street delivery) ZIP code serving Chattanooga, Tennessee, in Hamilton 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 37403 at a glance
| ZIP code | 37403 |
|---|---|
| Primary city | Chattanooga |
| State | Tennessee (TN) |
| County | Hamilton FIPS 47065 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 6,413 |
| Coordinates | 35.047600, -85.294480 |
How ZIP+4 works in 37403
The four digits after the hyphen encode a delivery segment inside 37403. 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 37403 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 Chattanooga
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 37403.
| ZIP | City | Distance |
|---|---|---|
| 37450 | Chattanooga, TN | 1 mi |
| 37402 | Chattanooga, TN | 1.2 mi |
| 37408 | Chattanooga, TN | 1.6 mi |
| 37404 | Chattanooga, TN | 1.8 mi |
| 37407 | Chattanooga, TN | 3.2 mi |
| 37410 | Chattanooga, TN | 3.3 mi |
| 37406 | Chattanooga, TN | 3.3 mi |
| 37411 | Chattanooga, TN | 3.9 mi |
| 37351 | Lupton City, TN | 4.1 mi |
| 37409 | Chattanooga, TN | 4.3 mi |
| 37350 | Lookout Mountain, TN | 4.9 mi |
| 37412 | Chattanooga, TN | 5.1 mi |
Questions about 37403
What is the ZIP+4 code for 37403?
37403 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 37403, you need to look up a specific street address to get them.
What city is 37403?
37403 is assigned to Chattanooga, Tennessee, in Hamilton 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.