I’d suggest a song that I first heard of through the Dope: Cold Missouri Waters by Cry, Cry, Cry. Of course, part of it is that I loved the book that inspired the song.
Depending on your tastes, you might want to review your Jimmy Buffett - a lot of his songs are ballads. Off the top of my head: The Captain and the Kid, Margaritaville, Fins, The Great Filling Station Hold Up, Jolly Mon Song, and Sending the Old Man Home all qualify.
Also, many Scots/Irish folk songs are ballads.
And, I don’t think you should forget Harry Chapin for some really lovely, heartbreaking ballads. Sniper, The Rock, A Better Place to Be, Taxi, Sequel, Dance Band on the Titanic…
Some other of my favorite ballads: Crusader by Chris de Burgh. (Great song. Awful history.)
Port of Call by Battlefield Band
Two by Johnny Horton: The Battle of New Orleans (though that’s really just an adaptation of a folk ballad); and Sink the Bismark!
Space Oddity by David Bowie
Rah, Rah Rasputin by Boiled in Lead (Great song. Gooood history.)
The Miller’s Will is a fun, traditional ballad.
A less traditional ballad that I, personally, love is It’s a Long Way from Amphioxus. (AIUI the song is now bad science, but I don’t care!) Alas the only recording I know of it is the Folkways recording on the album, “Sam Hinton Sings the Songs of Men.” Whether that’s in print or available as a CD is beyond my knowledge…