This is a list of hillside letters (also known as mountain monograms) in the U.S. state of California. There are at least 83 hillside letters, acronyms, and messages in the state, possibly as many as 90, although some have been removed in recent years. Among these are the oldest letter (the C in Berkeley, 1905) and the largest letter (the L in Susanville, almost 600 feet long). 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 Hill figures in the United States Lists of public art in California