There are 4 Zenair CH-300 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 1991 and 2007.
N5028Z
2007 Doyle J A/Doyle M M ZENITH CH300
N127VV
2003 Kube Robert C ZENITH STOL CH 701
Cameron Park, CA
N331VR
1991 A A Sovran ZENITH CH-300
Centennial, CO
N24100
Christenson Odell CHALLENGER II
Alexandria, MN