ZIP Code 81221 — Coal Creek, CO
81221 is a standard (street delivery) ZIP code serving Coal Creek, Colorado, in Fremont 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 81221 at a glance
| ZIP code | 81221 |
|---|---|
| Primary city | Coal Creek |
| State | Colorado (CO) |
| County | Fremont FIPS 08043 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 324 |
| Coordinates | 38.362430, -105.142380 |
How ZIP+4 works in 81221
The four digits after the hyphen encode a delivery segment inside 81221. 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 81221 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 81221.
| ZIP | City | Distance |
|---|---|---|
| 81244 | Rockvale, CO | 1.2 mi |
| 81226 | Florence, CO | 3.5 mi |
| 81240 | Penrose, CO | 11.2 mi |
| 81253 | Wetmore, CO | 12.6 mi |
| 81005 | Pueblo, CO | 19.2 mi |
| 81007 | Pueblo, CO | 19.4 mi |
| 81212 | Canon City, CO | 19.8 mi |
| 80926 | Colorado Springs, CO | 22.7 mi |
| 80860 | Victor, CO | 22.9 mi |
| 81252 | Westcliffe, CO | 23.1 mi |
| 81023 | Beulah, CO | 23.6 mi |
| 81223 | Cotopaxi, CO | 25 mi |
Questions about 81221
What is the ZIP+4 code for 81221?
81221 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 81221, you need to look up a specific street address to get them.
What city is 81221?
81221 is assigned to Coal Creek, Colorado, in Fremont 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.