| Official Name: | Leyner, Colorado |
| Settlement Type: | Census Designated Place |
| Pushpin Map: | USA |
| Pushpin Label: | Leyner |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location of the Leyner CDP in the United States |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Boulder County |
| Government Type: | unincorporated community |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.612 |
| Area Land Km2: | 0.506 |
| Area Water Km2: | 0.106 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 40 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Timezone: | MST |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Coordinates: | 40.0511°N -105.1075°W |
| Elevation Ft: | 5033 |
| Postal Code Type: | ZIP Code[3] |
| Postal Code: | Lafayette 80026 |
| Area Codes: | 303 & 720 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 2583260 |
Leyner is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States. The CDP is a part of the Boulder, CO Metropolitan Statistical Area. The population of the Leyner CDP was 40 at the United States Census 2020. The Lafayette post office (Zip Code 80026) serves the area.[3]
Leyner is located in eastern Boulder County along the west side of U.S. Route 287, 4miles north of Lafayette. Boulder Creek forms the northern edge of the CDP.
The Leyner CDP has an area of 0.612km2, including 0.106km2 of water.[1]
A rail line was built through the Leyner area in the early 1870s by the Denver & Boulder Valley Railroad, connecting Boulder and Brighton. The D&BV was acquired by the Union Pacific Railroad in 1898. Leyner does not appear on topographic maps until 1951, and it was adjacent to a siding, indicating that it was probably a railway station at some point in history.[4]
The rail line has been owned since 2009 by the Regional Transportation District.[5]
The United States Census Bureau initially defined the for the