Hey, c’mon, Primal – take some initiative. It ain’t a tough one.
Pick up an Atlas. Look in the index. My National Geographic World Atlas (1992) gives Somersets in the following:
In addition, there is Somerset County in England, Somerset Center in Michigan, Somerset East and Somerset West in South Africa, Somerset Island in Bermuda, Somerset Island in NW Territory (Canada), and Somerset reservoir in Mass and Vermont. There’s also a Somerset-Burnie in Australia, don’t know if you want to count that.
Interestingly, my Hammond World Atlas (1996) shows a Somerset in NY.