There are 4 Polikarpov PO-2 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 1936 and 1944.
N46GU
1944 Polikarpov PO-2
Tacoma, WA
N3602
1936 Polikarpov PO-2
Virginia Beach, VA
N50074
Polikarpov PO-2
Polk City, FL
N9016J
Polikarpov PO-2
Sound Beach, NY