This is a list of historic counties of England by area as at the 1831 census.1831 Census cited in Vision of Britain - Ancient county data Note that Monmouthshire was considered to be part of England at the time.
RankCountyArea1Yorkshire 1831 Census cited in National Statistics - 200 years of the Census in... (PDF)2Lincolnshire3Devon4Norfolk5Northumberland6Somerset7Hampshire8Essex9Lancashire10Kent11Cumberland12Suffolk13Sussex14Wiltshire15Shropshire16Cornwall17Gloucestershire18Staffordshire19County Durham20Derbyshire21Cheshire22Northamptonshire23Dorset24Warwickshire25Herefordshire26Cambridgeshire27Nottinghamshire28Leicestershire29Westmorland30Surrey31Berkshire32Oxfordshire33Buckinghamshire34Worcestershire35Hertfordshire36Monmouthshire37Bedfordshire38Huntingdonshire39Middlesex40Rutland
References