How many submarines does the US navy have?

Answer 1

According to Wikipedia the US Navy has:

• Los Angeles class (29 in commission, 2 in reserve) – fast attack submarines
• Ohio class (18 in commission) – 14 ballistic missile submarines (SSBNs), 4 guided missile submarines (SSGNs)
• Seawolf class (3 in commission) – fast attack submarines
• Virginia class (19 in commission, 1 delivered, 1 fitting out, 7 under construction, 2 on order) – fast attack submarines

The existing fleet of ballistic submarines currently carries 54 percent of the United States' nuclear deterrent arsenal.

Answer 2

they have 78 all togather, however, only 72 are active and 6 are under construction.

Update: 71 active, including five fairly recently launch VA- class fast attack subs.

Answer 3

75