Irish Rangers/North Irish Militia
| Dates | Locations | Higher Formation/Remarks |
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| . | North Irish Militia | . |
| 1967.04.01 | Formed in TAVR II with companies serving as successors to former TA battalions in the North Irish Brigade: | . |
| . | HQ Company at Portadown, successor to 5th Bn The Royal Inniskilling Fusiliers | . |
| . | A (Royal Inniskilling Fusiliers) Company at Omagh with det at Enniskillen , successor to 5th Bn The Royal Inniskilling Fusiliers | . |
| . | B (Royal Ulster Rifles) Company at Newtownabbey, Belfast, successor to 6th Bn The Royal Ulster Rifles | . |
| . | C (Royal Irish Fusiliers) Company at Portadown, successor to 5th Bn The Royal Irish Fusiliers | . |
| . | D (London Irish Rifles) Company at Chelsea, London, and Hillington, Middlesex, successor to 1st Bn The London Irish Rifles, The Royal Ulster Rifles | . |
| 1972 | Renamed The North Irish Militia (4th (Volunteer) Battalion), The Royal Irish Rangers) | . |
| 1978.04.18 | Renamed 4th (Volunteer) Battalion, The Royal Irish Rangers (27th (Inniskilling) 83rd and 87th) (The North Irish Militia): HQ at Portadown | . |
| . | HQ Company at Portadown | . |
| . | A (Royal Inniskilling Fusiliers) Company at Omagh with det at Enniskillen | . |
| . | B (Royal Ulster Rifles) Company at Newtownabbey, Belfast | . |
| . | C (Royal Irish Fusiliers) Company at Portadown | . |
| . | D (London Irish Rifles) Company at Chelsea, London and Hillington, Middlesex | . |
| 1981 | C Company redesignated as A Company, 5th Battalion; new C (Royal Irish Fusiliers) Company formed at Ballymena and Limavady | . |
| 1992.04.01 | Reduced to a three rifle company order of battle: D Company at Chelsea, London, redesignated as D Company 8th Battalion, The Queen's Fusiliers | . |
| 1992.07.01 | Formed part of corps of The Royal Irish Regiment without change of designations | . |
| 1993.04.01 | Amalgamated with 5th (Volunteer) Battalion to form 4th/5th Battalion, The Royal Irish Rangers (Volunteers) | . |
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| . | 5th (Volunteer) Battalion, The Royal Irish Rangers (27th (Inniskilling) 83rd and 87th) | . |
| 1971.04.01 | Formed with HQ and a Command and Admin Platoon at Armagh from cadres: | . |
| . | B (Royal Irish Rifles) Company at Killyleagh, formed from cadre 6th Bn, The Royal Ulster Rifles | . |
| . | C (Royal Irish Fusiliers) Company at Armagh and Lurgan, formed from cadre 5th Bn, The Royal Irish Fusiliers | . |
| 1978 | Battalion changed to BAOR role; company subtitles omitted?; B Company formed pln at Bangor | . |
| 1980 | C Company consolidated at Lurgan, HQ Company formed at Armagh from elements C Company | . |
| 1981 | A Company formed at Lisburn by transfer of C Company 4th Battalion | . |
| 1982 | B Company moved to Newtownards; HQ Company and Support Weapons Groups moved to Banbridge, HQ remained at Armagh | . |
| 1986 | D Company formed at Lisburn, moved to Belfast in 1988; Recce Pln formed at Armagh | . |
| 1992.07.01 | Formed part of corps of The Royal Irish Regiment without change of designations | . |
| 1993.04.01 | Amalgamated with 4th (Volunteer) Battalion to form 4th/5th Battalion The Royal Irish Rangers (Volunteers) | . |
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| . | 4th/5th Battalion The Royal Irish Rangers (Volunteers) | . |
| 1993.04.01 | Formed by amalgamtion of 4th (Volunteer) Battalion and 5th (Volunteer) Battalion, The Royal Irish Rangers, HQ at Charles Street, Portadown | . |
| . | HQ Company at Portadown with dets at Armagh and Enniskillen by amalgamation of HQ Company 4th Battalion and HQ Company and A Company 5th Battalion | . |
| . | A Company at Newtownards by redesignation of 'B' Company 5th Battalion | . |
| . | B Company at Newtownabbey by redesignation of 'B' Company 4th Battalion | . |
| . | C Company at Ballymena by redesignation of 'C' Company 4th Battalion | . |
| 1999.07.01 | As a result of the Strategic Defence Review and battalion reorganised as The Royal Irish Rangers | . |
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| . | The Royal Irish Rangers | . |
| 1999.07.01 | Formed by redesignation of 4th/5th Battalion The Royal Irish Rangers (Volunteers), Headquarters at Portadown | . |
| . | HQ Company at Portadown by redesignation of HQ Company 4th/5th Battalion. GPMG (SF) Pln at Portadown, Assault Pioneer Pltn at Enniskillen. | . |
| . | A Company at Newtownards by redesignation of A Company 4th/5th Battalion | . |
| . | B Company at Abbotscroft, Newtownabbey by redesignation of B Company 4th/5th Battalion | . |
| . | North Irish Horse at Dunmore Park, Belfast | . |
| . | Note: GPMG (SF) platoon probably under OPCOM A Company; Assault Pioneer platoon under B Company | . |
| c2007 | Redesignated 2nd Battalion, Royal Irish Regiment | . |
| c2013 | Battalion HQ and HQ Company at Portadown. To move to Lisburn by Dec 16. Portadown backfilled by C Company | . |
| . | A Company at Belfast | . |
| . | B Company at Newtonabbey and Ballymena | . |
| . | C Company at Armagh and Enniskillen. Armagh det to move to Portadown by Dec 2016. Armagh TA Centre to be vacated | . |
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