Fun fact: Clawson is the only currently serving Mormon Congressman from outside the Mountain West region.
Correct. There are nine Mormons in the House: Clawson, Cresent Hardy (NV-04), Matt Salmon (AZ-06), and all 6 from Utah and Idaho. They're all Republicans, though there are two Mormon Democrats in the Senate (Tom Udall and Harry Reid).
Mark Udall of Colorado was also a Mormon IIRC, but he was defeated for reelection so RIP.
Actually Mark has never been a Mormon; his dad Mo Udall became an inactive Mormon long before Mark's birth, and I don't believe Mark identifies as any particular religion. Tom's dad Stewart Udall was more devout, but Tom Udall is rumored to be a Mormon in name only (a MINO, if you will).
Harry Reid is a believer though; he attends church services in both DC and Las Vegas back in Nevada; I even know a guy who attends that particular Vegas congregation and took pictures of Harry Reid chilling out in a church pew. He's also addressed the LDS Democrats caucus multiple times.