There are 9 Grumman HU-16 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 1951 and 1955.
N7025N
1955 Grumman HU-16
Wilmington, DE
N7927
1955 Grumman HU-16
Dover, DE
N7026C
1951 Grumman HU-16
Batavia, OH
N99TP
1951 Grumman HU-16
Cape Coral, FL
N216HU
Grumman HU-16
Scottsdale, AZ
N43155
Grumman HU-16
Camarillo, CA
N4796U
Grumman HU-16
Wilmington, DE
N7025J
Grumman HU-16
Albuquerque, NM
N888AC
Grumman HU-16