ZIP Code 80121 — Littleton, CO
80121 is a standard (street delivery) ZIP code serving Littleton, Colorado, in Arapahoe 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 80121 at a glance
| ZIP code | 80121 |
|---|---|
| Primary city | Littleton |
| State | Colorado (CO) |
| County | Arapahoe FIPS 08005 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 18,029 |
| Coordinates | 39.610450, -104.954210 |
How ZIP+4 works in 80121
The four digits after the hyphen encode a delivery segment inside 80121. 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 80121 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 Littleton
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 80121.
| ZIP | City | Distance |
|---|---|---|
| 80122 | Littleton, CO | 2.1 mi |
| 80113 | Englewood, CO | 2.2 mi |
| 80120 | Littleton, CO | 3.2 mi |
| 80237 | Denver, CO | 3.5 mi |
| 80110 | Englewood, CO | 3.8 mi |
| 80111 | Englewood, CO | 3.9 mi |
| 80222 | Denver, CO | 4.4 mi |
| 80210 | Denver, CO | 4.7 mi |
| 80126 | Littleton, CO | 4.8 mi |
| 80236 | Denver, CO | 5.4 mi |
| 80129 | Littleton, CO | 5.5 mi |
| 80231 | Denver, CO | 5.5 mi |
Questions about 80121
What is the ZIP+4 code for 80121?
80121 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 80121, you need to look up a specific street address to get them.
What city is 80121?
80121 is assigned to Littleton, Colorado, in Arapahoe 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.