[The series and its rules are explained here, where you will also find links to the songs for the other states.]
12:1. My Idaho Home: 'I still love Momma and Daddy best in my Idaho home'. (1, 2.)
12:2. Easy's Gettin' Harder Every Day: 'We'll watch some TV show / Of a bunch of folks who've never heard of Idaho'. (1, 2.)
12:3. April 14th: 'I saw the van out in front / From Idaho'. (1, 2.)
12:4. Everywhere I Go: 'And God likes guns, doves are hawks, and Jesus walks in Idaho'. (1, 2.)
12:5. Private Idaho: 'You're living in your own Private Idaho'. (1, 2.)
12:6. What's Your Name? - 'It's 8 o'clock in Boise, Idaho'. (1, 2, 3.)
12:7. Let Me Die In My Footsteps: 'Nevada, New Mexico, Arizona, Idaho / Let every state in this union seep deep down in your soul'. (1, 2, 3.)
12:8. Rhode Island Is Famous For You: 'And spuds from Idaho'. (1, 2, 3, 4.)
12:9. Born In A Trunk: 'I was born in a trunk / In the Princess Theatre in Pocatella, Idaho'. (1, 2, 3.)
12:10. Idaho: 'I think I'm movin' to Idaho'. (1, 2.)
12:11. Here We Have Idaho. (1, 2, 3.)
12:12. Up In Indiana: 'Wish I was floatin' on the river / Out in Idaho'. (1, 2.)
12:13. Santa Rosa: 'Me and Mickey Craig were running west from Idaho'. (1.)
12:14. I've Been Everywhere: 'Idaho, Jellicoe, Pickle Cros, Argentina'. (1, 2, 3.)
12:15. Children of the Wild World: 'You probably come from Idaho where the cool air treats you right'. (1, 2.)
12:16. Idaho: 'Idaho oh Idaho'. (1, 2, 3, 4, 5.)
12:17. Silver Eagle: 'One night on the road / Just south of the I-dee-ho line'. (1, 2, 3.)