ZIP Code 81433 — Silverton, CO
81433 is a standard (street delivery) ZIP code serving Silverton, Colorado, in San Juan 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 81433 at a glance
| ZIP code | 81433 |
|---|---|
| Primary city | Silverton |
| State | Colorado (CO) |
| County | San Juan FIPS 08111 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 651 |
| Coordinates | 37.793460, -107.594480 |
How ZIP+4 works in 81433
The four digits after the hyphen encode a delivery segment inside 81433. 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 81433 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 81433.
| ZIP | City | Distance |
|---|---|---|
| 81427 | Ouray, CO | 14 mi |
| 81426 | Ophir, CO | 14.1 mi |
| 81435 | Telluride, CO | 19.4 mi |
| 81235 | Lake City, CO | 19.9 mi |
| 81332 | Rico, CO | 22.7 mi |
| 81301 | Durango, CO | 23.1 mi |
| 81432 | Ridgway, CO | 24.3 mi |
| 81130 | Creede, CO | 30.4 mi |
| 81430 | Placerville, CO | 30.5 mi |
| 81122 | Bayfield, CO | 33.1 mi |
| 81243 | Powderhorn, CO | 39.5 mi |
Questions about 81433
What is the ZIP+4 code for 81433?
81433 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 81433, you need to look up a specific street address to get them.
What city is 81433?
81433 is assigned to Silverton, Colorado, in San Juan 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.