1885–1918 The constituency was created as the Southern or Newbury Division of Berkshire under the
Redistribution of Seats Act 1885, when the three-member Parliamentary County of
Berkshire was divided into the three single-member constituencies of
Abingdon, Newbury and
Wokingham. It comprised: • The Boroughs of Newbury and Reading; • the Sessional Divisions of Ilsley, Lambourn, Newbury (including Hungerford), and Reading (except the parishes of East Swallowfield and West Swallowfield); and • Part of the Sessional Division of Wokingham. Only non-resident freeholders of the municipal borough Reading (which comprised the Parliamentary Borough of
Reading) were entitled to vote.
1918–1950 • The Boroughs of Newbury and Wokingham; • The Rural Districts of Hungerford and Newbury; and • Parts of the Rural Districts of Bradfield and Wokingham.
Extended eastwards, with the addition of Wokingham and surrounding areas from the abolished Wokingham Division. Small area in the north transferred to Abingdon and areas which had been annexed by Reading County Borough transferred to the Parliamentary Borough thereof. 1950–1955 • The Borough of Newbury; and • The Rural Districts of Bradfield, Hungerford and Newbury.
The two Reading wards were transferred back to the re-established constituency of Reading North. The boundary with Abingdon was slightly amended to take account of changes to local government boundaries. 1983–1997 • The District of Newbury wards of Aldermaston, Basildon, Beenham, Bradfield, Bucklebury, Burghfield, Chieveley, Cold Ash, Compton, Craven, Downlands, Falkland, Greenham, Hungerford, Kintbury, Lambourn Valley, Mortimer, Northcroft, St John's, Shaw-cum-Donnington, Speen, Thatcham North, Thatcham South, Thatcham West, Turnpike, and Winchcombe.
Gained a small area of the abolished constituency of Abingdon (part of the former Rural District of Wantage) which was retained by Berkshire when the rest of the area comprising Abingdon was transferred to Oxfordshire by the Local Government Act 1972. Areas to the west of Reading included in the new constituency of Reading West. 1997–2010 • The District of Newbury wards of Aldermaston, Basildon, Beenham, Bradfield, Bucklebury, Chieveley, Cold Ash, Compton, Craven, Downlands, Falkland, Greenham, Hungerford, Kintbury, Lambourn Valley, Northcroft, St John's, Shaw-cum-Donnington, Speen, Thatcham North, Thatcham South, Thatcham West, Turnpike, and Winchcombe.
Small loss to Wokingham in the east of the constituency (Burghfield and Mortimer wards). 2010–2024 • The District of West Berkshire wards of Aldermaston, Basildon, Bucklebury, Chieveley, Clay Hill, Cold Ash, Compton, Downlands, Falkland, Greenham, Hungerford, Kintbury, Lambourn Valley, Northcroft, St John's, Speen, Thatcham Central, Thatcham North, Thatcham South and Crookham, Thatcham West, and Victoria.
Further minor loss to Wokingham. 2024–present Further to the
2023 periodic review of Westminster constituencies which became effective for the
2024 general election, the constituency is composed of the following (as they existed on 1 December 2020): • The District of West Berkshire wards of: Chieveley & Cold Ash; Downlands (polling districts BG, CA, CB, EA, FA, FB, GA1, GA2, LB and PC); Hungerford & Kintbury; Lambourn; Newbury Central; Newbury Clay Hill; Newbury Greenham; Newbury Speen; Newbury Wash Common; Thatcham Central; Thatcham Colthrop & Crookham; Thatcham North East; Thatcham West.
The electorate was further reduced to bring it within the permitted range by transferring eastern, rural areas to the new constituency of Reading West and Mid Berkshire. ==Members of Parliament==