The Meon Valley CLP represents an electorate of over 71 thousand voters in central southern Hampshire in southern England. This seat was formed by the Boundary Commission for England as an extra constituency in Hampshire, with electoral wards from East Hampshire, Havant and Winchester districts.

• From East Hampshire – the wards of Clanfield and Finchdean, Horndean Catherington and Lovedean, Horndean Downs, Horndean Hazleton and Blendworth, Horndean Kings, Horndean Murray and Rowlands Castle
• From Havant – the wards of Cowplain, Hart Plain and Waterlooville
• From Winchester – the wards of Bishops Waltham, Boarhunt and Southwick, Cheriton and Bishops Sutton, Denmead, Droxford, Soberton and Hambledon, Owslebury and Curdridge, Shedfield, Swanmore and Newtown, Upper Meon Valley, Whiteley and Wickham
• The largest towns in the constituency are Waterlooville and Horndean.