The new constituency established in 1983 combined
Hertford and
Ware, from the abolished constituency of
Hertford and Stevenage, with
Bishop's Stortford,
Sawbridgeworth and rural areas to the west, from the abolished constituency of
East Hertfordshire.
1983–1997: The District of East Hertfordshire wards of Bishop's Stortford Central, Bishop's Stortford Chantry, Bishop's Stortford Parsonage, Bishop's Stortford Thorley, Braughing, Buntingford, Hertford Bengeo, Hertford Castle, Hertford Kingsmead, Hertford Sele, Hunsdon, Little Hadham, Much Hadham, Sawbridgeworth, Standon St Mary, Stapleford, Tewin, Thundridge, Ware Christchurch, Ware Priory, Ware St Mary's, and Ware Trinity.
1997–2010: The District of East Hertfordshire wards of Bishop's Stortford Central, Bishop's Stortford Chantry, Bishop's Stortford Parsonage, Bishop's Stortford Thorley, Great Amwell, Hertford Bengeo, Hertford Castle, Hertford Kingsmead, Hertford Sele, Hunsdon, Little Amwell, Much Hadham, Sawbridgeworth, Stanstead, Ware Christchurch, Ware Priory, Ware St Mary's, and Ware Trinity. :
The villages of Stanstead Abbotts and Great Amwell transferred from Broxbourne. Northern, rural areas transferred to the new constituency of North East Hertfordshire. 2010–2024: The District of East Hertfordshire wards of Bishop's Stortford All Saints, Bishop's Stortford Central, Bishop's Stortford Meads, Bishop's Stortford Silverleys, Bishop's Stortford South, Great Amwell, Hertford Bengeo, Hertford Castle, Hertford Heath, Hertford Kingsmead, Hertford Sele, Hunsdon, Much Hadham, Sawbridgeworth, Stanstead Abbots, Ware Chadwell, Ware Christchurch, Ware St Mary's, and Ware Trinity. :
Marginal changes due to revision of local authority wards. 2024–present: The District of East Hertfordshire wards of Bishop's Stortford All Saints, Bishop's Stortford Central, Bishop's Stortford North, Bishop's Stortford Parsonage, Bishop's Stortford South, Bishop's Stortford Thorley Manor, Hertford Bengeo, Hertford Castle, Hertford Kingsmead, Hertford Sele, Hunsdon, Much Hadham, Sawbridgeworth, Ware Priory, Ware Rural (part), Ware St Mary's, and Ware Trinity. :
Reduced to meet the electorate size requirements, with the transfer of the three small wards of Great Amwell, Hertford Heath and Stanstead Abbots (as they existed on 1 December 2020) to Broxbourne. ==Members of Parliament==