Once again I let the ball drop... sorry folks.
Here's my answer:
Thirteen original United States:
1. New Hampshire (“Always first, always right...never marry a New Hampshirite")
3. Rhode Island
5. New York
6. New Jersey
11. North Carolina
12. South Carolina
Members of the Confederate States of America (which each declared their independence from the USA shortly before joining the Confederacy:
22?. Missouri declared independence and was claimed by the Confederacy, but never joined the Confederacy as it remained under Union control.
[Republic of West Florida (90 days in 1810)]
22. California (for a week in 1846)
23. Vermont (1777-1791)
24. Hawaii (independent prior to annexation in 1893)
This leaves aside the status of native tribes/nations, none of which formed the political basis of current American states, but many of which were recognized as independent by federal or colonial governements at some point in their history.