[The series and its rules are explained here, where you will also find links to the songs for the other states.]
18:1. Azalea: 'It was such a fine spring day / Down Louisiana way'. (1, 2.)
18:2. Oh Susannah: 'I'm going to Louisiana, my true love for to see'. (1, 2, 3, 4.)
18:3. Cottonfields: 'It was back in Louisiana / Just about a mile from Texarkana'. (1, 2, 3.)
18:4. Leaving Louisiana In The Broad Daylight: 'It gets real hot down in Louisiana'. (1, 2, 3.)
18:5. Got To Get To Louisiana. (1.)
18:6. Evangeline: 'Bayou Sam from South Louisian'. (1, 2, 3.)
18:7. Promised Land: 'Somebody help me get out of Louisiana'. (1, 2, 3.)
18:8. Listen To The Radio: 'There's a moon across the border in the Louisiana sky'. (1, 2.)
18:9. Louisiana Lady: 'Yeah, tonight I'll see my Louisiana lady'. (1, 2.)
18:10. I've Been Everywhere: '... Louisiana...'. (1, 2, 3, 4.)
18:11. Chantez Les Bas: 'Down in Louisiana, Louisiana'. (1, 2.)
18:12. If You're Gonna Play In Texas: 'That lead guitar is hot / But not for "Lousiana man"'. (1, 2, 3.)
18:13. Louisiana Woman Mississippi Man: 'Too much love in this Louisiana heart'. (1, 2.)
18:14. Louisiana 1927: 'Louisiana, Louisiana / They're tryin' to wash us away'. (1, 2, 3, 4.)
18:15. Louisiana Mama: 'She's my red hot Louisiana mama'. (1, 2.)
18:16. The Things That Matter Most To Me: 'I remember my boyhood days back in Faraday, Louisiana'. (1.)
18:17. Louisiana Blues: 'I'm going down in Louisiana, baby, behind the sun'. (1, 2, 3, 4.)
18:18. Gary, Indiana: 'Not Louisiana'. (1, 2.)
18:19. Johnny B Goode: 'Deep down in Louisiana close to New Orleans'. (1, 2, 3.)
18:20. Up On Cripple Creek: 'To Lake Charles, Louisiana'. (1, 2, 3.)
18:21. Miles And Miles Of Texas: 'I was born in Louisiana'. (1, 2, 3, 4.)
18:22. Tucson, Arizona (Gazette): 'Mary Estelle Hanna came out from Louisiana for the sun'. (1, 2.)
18:23. Louisiana Man: 'Gotta make a living, he's a Louisiana man'. (1, 2, 3, 4.)
18:24. Dani California: 'Black bandana, sweet Louisiana'. (1, 2, 3.)
18:25. Southern Comfort: 'Ah-um Louisiana Ah-um Nashville Tennessee'. (1.)
18:26. Mississippi Queen: 'Way down around Vicksburg, around Louisiana way'. (1, 2, 3.)
18:27. Louisiana Saturday Night: 'Dance in the kitchen till the morning light / Louisiana Saturday Night'. (1, 2, 3, 4.)
18:28. Travelin' Mood: 'Goin' to Alabammy, goin' to Louisiana, Tennessee'. (1.)
18:29. I Love You: 'We're gonna roll all the way to la Louisiana'. (1, 2.)
18:30. It Don't Get Any Better Than This: 'Way down in Louisiana, down in New Orleans'. (1.)
18:31. Louisiana Moon: 'Louisiana Moon / Done cast its spell on me, yeah'. (1.)
18:32. Lake Charles: 'He always said Louisana / Was where he felt at home'. (1, 2, 3.)
18:33. Concrete And Barbed Wire: 'Somewhere in Louisiana my sugar's doin' time'. (1, 2.)