| Clark | Jno C N | | | B Division
Source: QSA and KSA medal rolls | South African Constabulary |
| Clark | Jno Patk | 39466 | Private | Joined 17 Oct 01
Source: Nominal roll in WO127 | Cape Medical Staff Corps |
| Clark | John | 7 | Pte | Medal returned
Source: QSA and KSA medal rolls | Middleton Town Guard |
| Clark | John | 640 | Private | Source: OZ-Boer database | Victoria, 2nd Battalion Australian Commonwealth Ho |
| Clark | John | 3293 | Private | 3rd RPR
Source: Nominal roll in WO127 | Railway Pioneer Regiment |
| Clark | John | | Trooper | Served 20 Feb 1900 to 30 Nov 1900. No. 4 Co. Discharged Capetown medically unfit
Source: Nominal roll in WO127 | Border Horse |
| Clark | John | 9180 | Private | Source: QSA Medal Rolls | 20th Company, 6th Btn, IY |
| Clark | John | | Private | Served 23 Mar 00 to 26 Mar 01.
Source: Nominal roll in WO127 | Cape Medical Staff Corps |
| Clark | John | 26 | Trooper | Source: Nominal roll in WO127 | Warwick's Scouts |
| Clark | John | 29851 | Private | Source: QSA Medal Rolls | 107th Company, 6th Btn, IY |
| Clark | John | 64/632 | | Source: Medal rolls | Canada, 1st Canadian Mounted Rifles |
| Clark | John | 4189 | Private | QSA (5). 'L.J. Clarke' on E.C. Roll.
Source: QSA medal rolls | 1st (King's) Dragoon Guards |
| Clark | John | 4540 | Private | QSA (5). To 1 P.R. Dragoons for Discharge. 'Clarke' on E.C. Roll.
Source: QSA medal rolls | 1st (King's) Dragoon Guards |
| Clark | John | 4178 | Private | Source: QSA Medal Rolls | 30th Company, 9th Btn, IY |
| Clark | John | | | 1st Battalion
Source: QSA and KSA rolls | Imperial Light Horse |
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