This is a list of hillside letters (also known as mountain monograms) in the U.S. state of Montana. There are at least 86 hillside letters, acronyms, and messages in the state, possibly as many as 90. While western Montana provides plenty of mountains to support these monograms, many towns in the eastern prairie have also placed them on whatever hill they can find. Sources External links Mountain Monograms, a website explaining the origins and with an incomplete list and pictures Hillside Letters, a companion website to a book on the subject Letters on Hills, a category on waymarking.com for geocachers Modern Geoglyphs, a compilation of geoglyphs in Montana with photos and maps Geoglyphs Montana Lists of public art in the United States