1885–1918

• The Sessional Divisions of Forehoes, Guiltcross and Shropham, and Mitford and Launditch.^[4]

The constituency was created from parts of the Southern Division of Norfolk and parts of the abolished Eastern Division. The main settlements were East Dereham and Wymondham.

On abolition, southern areas, including Wymondham, were returned to the Southern Division and northern areas, including East Dereham, were transferred to the South-Western Division.

1983–1997

• The District of Breckland wards of Beetley and Gressenhall, East Dereham Neatherd, East Dereham St Withburga, East Dereham Toftwood, East Dereham Town, Eynsford, Hermitage, Launditch, Mattishall, Shipworth, Springvale, Swanton Morley, Taverner, Two Rivers, Upper Wensum, and Upper Yare; and

• The District of Broadland wards of Acle, Aylsham, Blofield, Brundall, Burlingham, Buxton, Cawston, Coltishall, Drayton, Foulsham, Freethorpe, Great Witchingham, Hainford, Hevingham, Horsford, Plumstead, Rackheath, Reedham, Reepham, South Walsham, Spixworth, St Faiths, Taverham, and Wroxham.^[5]

Eastern areas were transferred from Yarmouth, central areas (including Aylsham) from North Norfolk and western areas (including East Dereham) from South West Norfolk.

1997–2010

• The District of Breckland wards of Beetley and Gressenhall, East Dereham Neatherd, East Dereham St Withburga, East Dereham Toftwood, East Dereham Town, Eynsford, Hermitage, Launditch, Mattishall, Shipworth, Springvale, Swanton Morley, Taverner, Two Rivers, Upper Wensum, and Upper Yare; and
• The District of Broadland wards of Acle, Aylsham, Blofield, Brundall, Burlingham, Buxton, Cawston, Coltishall, Foulsham, Freethorpe, Great Witchingham, Hainford, Hevingham, Horsford, Plumstead, Rackheath, Reedham, Reepham, South Walsham, Spixworth, St Faiths, and Wroxham.^[6]

The District of Broadland wards of Drayton and Taverham were transferred to Norwich North.

2010–present

• The District of Breckland wards of All Saints, Buckenham, Burgh and Haverscroft, Dereham Central, Dereham Humbletoft, Dereham Neatherd, Dereham Toftwood, Eynsford, Haggard De Toni, Hermitage, Launditch, Necton, Queen's, Shipdham, Springvale and Scarning, Swanton Morley, Taverner, Templar, Two Rivers, Upper Wensum, Upper Yare, Watton, and Wissey; and

• The District of South Norfolk wards of Abbey, Cromwells, Hingham and Deopham, Northfields, Rustens, Town, and Wicklewood.^[7]

Significant changes. The District of Broadland areas, which had comprised the majority of the constituency, were now included in the new constituency of Broadland. The District of Breckland areas were retained from the 1997-2010 contents, with further parts, including Watton and Attleborough, transferred from South West Norfolk. The District of South Norfolk wards, which incorporated the town of Wymondham, were transferred from the constituency of South Norfolk.

Proposed

Further to the 2023 Periodic Review of Westminster constituencies, enacted by the Parliamentary Constituencies Order 2023, the composition of the Mid Norfolk constituency from the next general election, due by January 2025, will be (as they existed on 1^st December 2020):

• The District of Breckland wards of: All Saints & Wayland; Attleborough Burgh & Haverscroft; Attleborough Queens & Besthorpe; Dereham Neatherd; Dereham Toftwood; Dereham Withburga; Hermitage; Launditch; Lincoln; Mattishall; Necton; Saham Toney; Shipdham-with-Scarning; The Buckenhams & Banham; Upper Wensum; Watton.

• The District of South Norfolk wards of: Hingham & Deopham; Wicklewood.^[8]

The town of Wymondham is to be transferred back to South Norfolk. Other minor changes due to the revision of local authority ward boundaries.

MPs 1885–1918

MPs since 1983

Elections in the 2020s

Elections in the 2010s

Elections in the 2000s

Elections in the 1990s

Elections in the 1980s

Elections in the 1910s

General Election 1914–15:

Another General Election was required to take place before the end of 1915. The political parties had been making preparations for an election to take place and by July 1914, the following candidates had been selected;

• Unionist: William Lewis Boyle
• Liberal: David Waterlow

Elections in the 1900s

Elections in the 1890s

Elections in the 1880s