There’s no ukulele on the album version of Rilo Kiley’s Ripchord but, judging by the clips on YouTube, it’s become a ukulele mainstay in their live show with their guitarist Blake Sennett taking on uke and vocal duties. It seems that guitarists playing the uke move up and down the neck much more often than born ukulele players. You can see it songs like this and Panic at the Disco’s Friends in Holy Spaces.
A couple of things to look out for in the chord chart. First, There’s a chord I’ve labeled A5. It’s not strictly an A5 chord but an A chord. I’ve called it this to distinguish it from the other A chord in the song.
The second, and the trickiest part of the song, is the A6 chord in the intro. It’s a big stretch and he fluffs it a little himself. It’s such a big stretch I couldn’t fit in all on the chord diagram. The diagram shows the note on the eight fret of the A string. It actually needs to be on the ninth.
This would be a simpler way of playing it.