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).(This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources.)