- La Barge
- La Grange
- LaGrange
- Lake
- Lakeview North
- Lambert
- Lamont
- Lance Creek
- Lander
- Laramie
- Last Crossing Ford Number 9
- Latham
- Leahy Place
- Leckie
- Leefe
- Leiter
- Leo
- Linch
- Linden
- Lingle
- Linstead Place
- Little America
- Little Medicine
- Lone Tree Crossing
- Lonetree
- Long Island
- Lookout
- Lost Cabin
- Lost Springs
- Lovell