Here are the chords as given in Fred and Irwin Silber's Folksinger's Wordbook:

[C] Oh, what a beautiful city.
[G] Oh, what a [C] beautiful city
Oh, what a beautiful city
[C7] Twelve gates [F] to the [C] city, [G7]Halle[C]lujah[G7]

[C] Three gates in the east,
Three gates in the west,
Three gates in the north
Three gates in the south
[C7} Twelve gates [F] to the [C] city, [G7] Hallelu[C]jah

[C] Who are those children dressed in red?
[C7} Twelve gates [F] to the [C] city, [G7] Hallelu[C]jah
Must be the children that Moses led
[C7} Twelve gates [F] to the [C] city, [G7] Hallelu[C]jah


Here are the chords as given in Blood's and Patterson's Rise Up Singing

Oh, what a beautiful city.
Oh, what a beautiful city
Oh, what a beautiful city
Twelve gates to the city, Hallelujah
D D D D / A A DC A / D D D D / D G D A D G D D

Three gates in the east, three gates in the west,
Three gates in the north, three gates in the south
Twelve gates to the city, Hallelujah
D D D D / D D D D / D G D A D G D D

Who are those children dressed in red?
There's twelve gates to the city, Hallelujah
Must be the children that Moses led
There's twelve gates to the city, Hallelujah
D D D D / D G D A D G D D / D D D D / D G D A D G D D