Established
February 21, 1856
Transferred to Sandwich: February 2, 1859
Transferred to London: October 3, 1869
Boundaries
The territory comprises the following counties in the southwestern section of Ontario, namely, Middlesex, Elgin, Norfolk, Oxford, Perth, Huron, Lambton, Kent and Essex Counties.
Basic Statistics
| Area (sq. km) | 21,349 |
| Total Population | 1,944,182 |
| Catholic Population | 444,310 |
| Deaneries | 7 |
| Parishes and Missions | 131 |
| Diocesan Priests | 101 |
| Religious Priests | 35 |
| Permanent Deacons | 73 |
| Brothers | 1 |
| Sisters | 473 |
| Lay Ecclesial Ministers | 68 |