States with taxes on tampons:

1. Alabama
2. Arizona
3. Arkansas
4. California
5. Colorado
6. Connecticut
7. Florida
8. Georgia
9. Hawaii
10. Idaho
11. Illinois
12. Indiana
13. Iowa
14. Kansas
15. Kentucky
16. Louisiana
17. Maine
18. Michigan
19. Mississippi
20. Missouri
21. Nebraska
22. Nevada
23. New Mexico
24. New York
25. North Carolina
26. North Dakota
27. Ohio
28. Oklahoma
29. Rhode Island
30. South Carolina
31. South Dakota
32. Tennessee
33. Texas
34. Utah
35. Vermont
36. Virginia
37. Washington
38. West Virginia
39. Wisconsin
40. Wyoming

States with no sales tax on tampons

1. Alaska
2. Delaware
3. Montana
4. New Hampshire
5. Oregon

States with no tax on tampons

1. Maryland
2. Massachusetts
3. Minnesota
4. New Jersey
5. Pennsylvania

Sources

https://www.washingtonpost.com/news/wonk/wp/2016/01/08/the-tampon-tax-explained/