This brigade in the unit formation listed here was not formed by the first critical date 11 July 1921 and all data is for the period 1 July 1922 only. The brigade in the form in which it existed on 11 July 1921 formed part of the 1 Western Division. The 1 (Tuam) Battalion was then designated the 1 Battalion, Galway North Brigade. The 2 (Headford) Battalion was then designated the 3 Battalion, Galway Mid Brigade. The 3 (Claregalway) Battalion was then designated the 1 Battalion, Galway Mid Brigade.

1 (Tuam) Battalion: Unit strength on 1 July 1922 was 274 all ranks. The companies of the 1 Battalion were located as follows:  Barnaderg, Tuam, Cortoon, Sylane,  Corofin,  Abbeyknockmoy,  Miltown,  Belmount,  Gardenfield,  and Kilconly.
2 (Headford) Battalion: Unit strength on 1 July 1922 was 120 all ranks. The companies of the 2 Battalion were located as follows: Clooneen, Claran,  Caherlistrane,  and Annaghdown.
3 (Claregalway) Battalion: Unit strength on 1 July 1922 was 188 all ranks. The companies of the 3 Battalion were located as follows: Newcastle,  Cregmore,  Cussane,  Monivea,  and Kilcoona.

A North Galway Active Service Unit was located at Caherlistrane.  On 1 July 1922 it had a strength of 34 all ranks.  Personnel were drawn from the battalions of the brigade.