The United States

Tonight we were sitting around as a family watching YouTube videos that made us laugh. My father-in-law showed us this one, and we all got a good chuckle out of it.
So I decided to be a Saturday Night Scholar and claim that I was "fairly confident I could list all 50 states if given the chance".
Well I couldn't. Not quite. I am fairly confident though that I got more than any of those students could have. This is what I came up with, about 3/4 of them.

1. Alabama
2. Alaska
3. Hawaii
4. Washington
5. Utah
6. Nevada
7. California
8. New York
9. Pennsylvania
10. North Dakota
11. South Dakota
12. Virginia
13. West Virginia
14. New Jersey
15. Texas
16. Maine
17. Florida
18. Montana
19. North Carolina
20. South Carolina
21. Georgia
22. New Mexico
23. Kentucky
24. Massachusetts
25. Illinois
26. Ohio
27. New Hampshire -Eric told me I was missing a "New"
28. Oregon
29. Kansas - My mother-in-law hinted with the yellow brick road
30. Arkansas
31. Arizona
32. Oklahoma
33. Idaho
34. Iowa - my sister-in-law just yelled this one out
35. Wyoming
36. Rhodes Island
37. Delaware - this one Eric just told me
38. Maryland
39. Louisiana

So I forgot about 11 of them, and got hints for a couple. I am still pretty impressed with myself. What did I miss. American friends? Which ones am I missing?