The Southern division had its place of election[n 3] at Norwich. This was the same place of election as the abolished Eastern division. In 1868 the same two MPs who had sat for East Norfolk before its end were re-elected from this constituency.
1885–1918: The Sessional Divisions of Depwade, Diss, Earsham, Loddon and Clavering, and Swainsthorpe.
The northernmost parts were transferred to the re-established Eastern Division and western parts to the new Mid Division. It bordered Mid Norfolk to the west, the borough constituency of Norwich and East Norfolk to the north, the borough of Great Yarmouth and the Suffolk constituency of Lowestoft to the east and another Suffolk division, Eye, to the south.
1918–1950: The Urban District of Diss, the Rural Districts of Depwade, Forehoe, Henstead, and Wayland, and part of the Rural District of Thetford.
1950–1974: The Municipal Borough of Thetford, the Urban Districts of Diss and Wymondham, and the Rural Districts of Depwade, Loddon, and Wayland.
These areas combined to produce a somewhat more urban constituency than before. Thetford was transferred from South West Norfolk and the Rural District of Loddon regained from the abolished Eastern Division. The (combined) Rural District of Forehoe and Henstead was transferred to the new County Constituency of Central Norfolk.
1974–1983: The Municipal Borough of Thetford, the Urban Districts of Diss and Wymondham, and the Rural Districts of Depwade, Forehoe and Henstead, Loddon, and Wayland.
Regained the Rural District of Forhoe and Henstead, including Costessey, from Central Norfolk, which was now abolished.
This was the last redistribution before a major reorganisation of local government, which amalgamated many of the smaller local authorities and which was reflected in the 1983 redistribution.
2010–present: District of South Norfolk wards of Beck Vale, Bressingham and Burston, Brooke, Bunwell, Chedgrave and Thurton, Cringleford, Dickleburgh, Diss, Ditchingham and Broome, Earsham, Easton, Forncett, Gillingham, Harleston, Hempnall, Hethersett, Loddon, Mulbarton, Newton Flotman, Old Costessey, Poringland with the Framinghams, Rockland, Roydon, Scole, Stoke Holy Cross, Stratton, Tasburgh, and Thurlton.
Cringleford and Colney (but not New Costessey) transferred back from Norwich South. Seven District of South Norfolk wards, including Wymondham and surrounding areas, transferred to Mid Norfolk.
^As with all constituencies, the constituency elects one Member of Parliament (MP) by the first past the post system of election at least every five years. However from 1868-85 the constituency elected two members (see history)
^Where the hustings stood, at which nominations were made, votes cast before the introduction of multiple polling districts in county constituencies and the result was declared