The fourth volume of the series was published in 2011
Volume 4 contains eighteen chapters as follows:
- Population and Population Movements W. T. R. Pryce
- The Rural Economy Ian Pincombe
- Communications and Commerce Trevor Boyns
- The Iron and Steel Industry John Elliott
- The Coal Industry Bill Jones
- Urban Society C. Roy Lewis
- Rural Society Ian Pincombe
- The Language of Monmouthshire Sian Rhiannon Williams
- Literature in Welsh and English Sam Adams
- Education and Literacy Sian Rhiannon Williams
- Church and Chapel Christopher B. Turner
- Popular Culture, Leisure and Recreation Gareth Williams
- Visual Culture Peter Lord and John Morgan-Guy
- Parliamentary Representation Margaret Escott
- Local Government Andy Croll
- Popular Movements, 1780 – 1850 Chris Williams
- Trade Unionism and the Labour Movement, 1850 – 1914 John Williams
- The Question of Monmouthshire Chris Williams