There are 34 Grumman G-21A 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 1939 and 1962.
N74588
1962 Grumman G-21A
Roanoke, TX
N5548A
1959 Grumman G-21A
Oxford, CT
N327
1958 Grumman G-21A
Pittsford, NY
N9KL
1956 Grumman G-21A
Jefferson City, MO
N985R
1951 Grumman G-21A
Hudson, MA
N68157
1947 Grumman G-21A
Pearland, TX
N1019N
1946 Grumman G-21A
Ocklawaha, FL
N21A
1946 Grumman G-21A
Wilmington, DE
N22932
1946 Grumman G-21A
Fort Worth, TX
N703
1946 Grumman G-21A
Anchorage, AK
N741
1946 Grumman G-21A
Pittsford, NY
N329
1945 Grumman G-21A
Baldwin Park, CA
N6DF
1945 Grumman G-21A
Meridian, ID
N270DB
1944 Grumman G-21A
Gettysburg, PA
N69263
1944 Grumman G-21A
Jackson, MI
N7211
1944 Grumman G-21A
Oxford, CT
N401SJ
1943 Grumman G-21A
Williams, CA
N600ZE
1943 Grumman G-21A
Union City, TN
N778
1943 Grumman G-21A
Blaine, MN
N789
1943 Grumman G-21A
Anchorage, AK
N291VW
1942 Grumman G-21A
Sonoma, CA
N7811
1942 Grumman G-21A
Mcninnville, OR
N88821
1942 Grumman G-21A
Ketchikan, AK
N95467
1942 Grumman G-21A
Spokane, WA
N121SR
1940 Grumman G-21A
Middletown, DE
N39FG
1939 Grumman G-21A
Milpitas, CA
N48550
1939 Grumman G-21A
Mobile, AL
N345GG
Grumman G-21A
Wilmington, DE
N42GL
Grumman G-21A
Helena, MT
N4575C
Grumman G-21A
Casper, WY
N7821
Grumman G-21A
Baldwin Park, CA
N9074N
Grumman G-21A
Ione, CA
N9074U
Grumman G-21A
Jackson, MI
N9750Z
Grumman G-21A
Huxley, IA