Banjo D chord (Double C)D major on the 5-string banjo: 2 2 2 4, and 2 more shapes

Frets, string 4 to string 1: 2 2 2 4 (first position)

1. String 4 (C): 2nd fret, index finger (barre), D
2. String 3 (G): 2nd fret, index finger (barre), A
3. String 2 (C): 2nd fret, index finger (barre), D
4. String 1 (D): 4th fret, ring finger, F♯
5. String 5, the short g: open, G, not in the chord

Sounds: D A D F♯  ·  D is D, F♯, A (1 · 3 · 5)

Found in: G major (V), A major (IV), D major (I), A mixolydian (IV), D mixolydian (I), A dorian (IV)

The 5th string: the short g rubs against the F♯ in this shape, a semitone away: some players let it ring, some skip it.

With a capo: on the 2nd fret it’s 0 0 0 2 (frets counted from the capo), an open C shape. Spike the 5th string at the 7th fret to keep it in tune with the capo.

Double C tuning: gCGCD, the short 5th string first, then strings 4 to 1.