There are 4 Sikorsky S-76 aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1980 and 1991.
N919SF
1991 Sikorsky S-76
Corinth, TX
N176ET
1980 Sikorsky S-76
Wilmington, DE
N5447C
Sikorsky S-76
Milton, VT
N764MH
Sikorsky S-76
Broussard, LA