The USN has eight...all are retired:
1. USS Texas (the only Dreadnaught remaining afloat)
2. USS North Carolina (a survivor of a triple torpedoing in WWII in which the carrier USS Wasp was sunk, the destroyer USS O'Brian sank later, and North Carolina was seriously damaged...all from ONE TORPEDO SALVO).
3. USS Alabama
4. USS Masschusett
5. All four Iowa sisters:
A. USS Iowa
B. USS Missouri (WWII surrender occurred upon her decks 02 Sept '45)
C. USS Wisconsin
D. USS New Jersey (the only Vietnam War veteran of the four sisters)