Leyner is located in eastern Boulder County along the west side of U.S. Route 287, 4 miles (6 km) north of Lafayette. Boulder Creek forms the northern edge of the CDP.
The Leyner CDP has an area of 151 acres (0.612 km2), including 26 acres (0.106 km2) of water.[2]
History
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.[5] 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.[6]