The following states do NOT prohibit auto-open (also referred to as automatic, switchblade or switch knife) for non-law enforcement citizens.  Check State Knife Laws for specific details on possession, carry, manufacturer or sale as some restrictions may apply in a specific state.  See the list below for blade length restrictions.

1. Alabama
2. Alaska
3. Arizona
4. Arkansas
5. California (less than 2″ blade length limitation)
6. Colorado (effective approximately Aug. 9, 2017; concealed carry maximum length 3-1/2″)
7. Connecticut (maximum 1-1/2″ blade length limitation)
8. Florida
9. Georgia
10. Idaho
11. Illinois (effective Aug. 11, 2017 with valid Firearms Owner’s Identification Card FOID)
12. Indiana
13. Iowa
14. Kansas (since 2013)
15. Kentucky (only with weapons license)
16. Louisiana (effective August 1, 2018)
17. Maine (effective October 15, 2015)
18. Massachusetts (maximum 1-1/2″ blade length limitation)
19. Michigan (effective October 10, 2017 – out-the-front, double edged automatics still prohibited)
20. Mississippi
21. Missouri (since 2012)
22. Montana (maximum 1-1/2″ blade length limitation – removed 2019)
23. Nebraska
24. Nevada (effective July 1, 2015 – 2″ blade length limitation removed)
25. New Hampshire (since 2010)
26. North Carolina  (concealed carry not recommended)
27. North Dakota (maximum 5″ blade length limitation)
28. Oklahoma (effective November 1, 2015)
29. Oregon
30. Rhode Island
31. South Carolina
32. South Dakota
33. Tennessee
34. Texas
35. Utah
36. Vermont (less than 3″ blade length limitation)
37. Washington (manufacture allowed, limited possession to law enforcement and emergency personnel)
38. West Virginia (must be 21 years of age)
39. Wisconsin (effective February, 2016)
40. Wyoming