South Wales Borderers
| Dates | Locations | Higher Formation/Remarks |
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| . | 2nd Battalion, The Monmouthshire Regiment | . |
| 1947.04.01 | Reconstituted in T.A. with HQ at Pontypool, and concurrently amalgamated with duplicate 4th Battalion, now the sole infantry battalion for Monmouthshire and Brecknockshire | 160 (South Wales) Infantry Brigade |
| . | A Company at Cwmbran | . |
| . | B Company at Blaenavon | . |
| . | C Company at Crumlin | . |
| . | D Company at Monmouth | . |
| 1967.04.01 | Disbanded and concurrently reconstituted as two units: | . |
| . | B Company (South Wales Borderers), Welsh Volunteers, in TAVR II at Newport | . |
| . | The Monmouthshire (Territorial) Battalion, The South Wales Borderers, in TAVR III with HQ at Newport | . |
| . | 1st Monmouthshire Company at Newport | . |
| . | 2nd Monmouthshire Company at Cwmcarn | . |
| . | 3rd Monmouthshire Company at Abertillery | . |
| 1969.01.01 | TAVR III element reduced to cadre as The Monmouthshire Battalion, The South Wales Borderers at Newport, sponsored by Welsh Volunteers | . |
| 1969.06.11 | Transferred to the corps of The Royal Regiment of Wales | . |
| <1971.03.01> | Cadre redesignated 3rd (Monmouthshire) Battalion, The Royal Regiment of Wales | . |
| 1971.04.01 | 3rd (Volunteer) Battalion, The Royal Regiment of Wales (24th/41st Foot) formed with Headquarters at Maindy Barracks, Cardiff from cadre The Monouthshire Battalion The South Wales Borderers and companies from the late Welsh Volunteers | . |
| . | Companies reorganised with no further explicit Monmouthshire designation: | . |
| . | A Company at Abertillery with plns at Blackwood and Cwmcarn, newly raised | . |
| . | B Company at Newport and Pontypool, formed by redesignation of B Coy Welsh Volunteers and cadre The Monmouthshire Battalion | . |
| . | Cadre also formed detachment 211 (South Wales) Lt AD Battery RA (V) | . |
| 1993.10.10 | B (Rorke's Drift) Company, 2nd (Volunteer) Battalion, The Royal Regiment of Wales (24th/41st Foot) formed at Cefn Fforest with Pln at Pontypool, amalgamation of A Company and B Company 3rd Battalion | . |
| 1999.07.01 | Battalion amalgamated with 3rd (V) Bn, The Royal Welch Fusiliers, to form The Royal Welsh Regiment with no remaining presence in Monmouthshire | . |
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