This is a list of historic counties of England by area according to the Arrowsmith map of 1815-6, which was in turn generated from the work of the Ordnance Survey.
RankCountyArea1Yorkshire5,961 sq mi2Lincolnshire2,748 sq mi3Devon2,579 sq mi4Norfolk2,092 sq mi5Northumberland1,871 sq mi6Lancashire1,831 sq mi7Somerset1,642 sq mi8Hampshire1,628 sq mi9Kent1,537 sq mi10Essex1,532 sq mi11Suffolk1,512 sq mi12Cumberland1,478 sq mi13Sussex1,463 sq mi14Wiltshire1,379 sq mi15Shropshire1,341 sq mi16Cornwall1,327 sq mi17Gloucestershire1,256 sq mi18Staffordshire1,148 sq mi19County Durham1,061 sq mi20Cheshire1,052 sq mi21Derbyshire1,026 sq mi22Northamptonshire1,017 sq mi23Dorset1,005 sq mi24Warwickshire902 sq mi25Herefordshire860 sq mi26Cambridgeshire858 sq mi27Nottinghamshire837 sq mi28Leicestershire804 sq mi29Westmorland763 sq mi30Surrey758 sq mi31Berkshire756 sq mi32Oxfordshire752 sq mi33Buckinghamshire740 sq mi34Worcestershire729 sq mi35Hertfordshire528 sq mi36Monmouthshire498 sq mi37Bedfordshire463 sq mi38Huntingdonshire370 sq mi39Middlesex282 sq mi40Rutland149 sq mi
References