Possible Clues:

• Least populous US state
• Cheyenne's state: Abbr.
• Casper's st.
• Bighorn Mtns. site
• Neighbor of Neb
• It's N of Colo.
• Laramie's state: Abbr.
• Least populous st.
• First st. with women voters
• Grand Teton Natl. Pk. setting