ZIP Code 83720 — Boise, ID
83720 is a standard (street delivery) ZIP code serving Boise, Idaho, in Ada 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 83720 at a glance
| ZIP code | 83720 |
|---|---|
| Primary city | Boise |
| State | Idaho (ID) |
| County | Ada FIPS 16001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Boise |
| Coordinates | 43.617710, -116.199730 |
How ZIP+4 works in 83720
The four digits after the hyphen encode a delivery segment inside 83720. 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 83720 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 Boise
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 83720.
| ZIP | City | Distance |
|---|---|---|
| 83725 | Boise, ID | 0.9 mi |
| 83706 | Boise, ID | 1.9 mi |
| 83703 | Boise, ID | 3.6 mi |
| 83702 | Boise, ID | 3.9 mi |
| 83712 | Boise, ID | 4.1 mi |
| 83705 | Boise, ID | 4.4 mi |
| 83704 | Boise, ID | 4.4 mi |
| 83709 | Boise, ID | 6.3 mi |
| 83713 | Boise, ID | 6.9 mi |
| 83714 | Garden City, ID | 8.2 mi |
| 83642 | Meridian, ID | 10.5 mi |
| 83646 | Meridian, ID | 11.8 mi |
Questions about 83720
What is the ZIP+4 code for 83720?
83720 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 83720, you need to look up a specific street address to get them.
What city is 83720?
83720 is assigned to Boise, Idaho, in Ada 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.