GRO Registration Districts

English & Welsh registration district volume numbers
  CCC 1837-1852 1852-1946 1946-1974 1974  
Greater London LND 1 - 5 1A - 1D* 5A - 5D 11 - 15 *1E does not exist. A Vol ref that looks like 1e will therefore be 1c.
Surrey SRY 4 2A 5G 11, 13 - 15, 17  
Kent KEN 5 2A 5B 11, 16  
Sussex SSX 7 2B 5H 18  
Isle of Wight IOW 8 2B 6B 20  
Hampshire HAM 7 - 8 2B - 2C 6B 14, 20, 23  
Berkshire BRK 6 2C 6A 19, 20  
Hertfordshire HRT 6 3A 4B 10 - 11  
Oxfordshire OXF 16 3A 6B, 7B 20  
Buckinghamshire BKM 6 3A 6A 19  
Middlesex MDX 3 3A* 5A - 5E 11 - 13 *3A includes Edmonton (Tottenham etc).
Bedfordshire BDF 6 3B 4A 9  
Cambridgeshire CAM 14 3B 4A 9  
Huntingdonshire HUN 14 3B 4B 9  
Northamptonshire NTH 15 3B 3B 7  
Essex ESS 12 4A* 4A, 5A 9, 11, 13, 15 *4A includes West Ham
Suffolk SFK 12 - 13 4A 4B 10 - 11  
Norfolk NFK 13 4B 4B 10  
Wiltshire WIL 8 5A 7C 10  
Dorset DOR 8 5A 6A, 7C 22 - 23  
Devon DEV 9 - 10 5B 7A 21  
Cornwall/Scilly CON 9 5C 7A 21  
Somerset SOM 10 - 11* 5C, 6A** 7C 22 - 23 * In Somerset vol XI or 11 is for Bristol districts only.
Page: 43
**In Somerset 6A is for Bristol districts only.
Gloucestershire GLS 11 6A 7B 22  
Shropshire SAL 18 6A 9A 30  
Herefordshire HEF 26 6A 9A 29  
Staffordshire STS 17 6B 9B 30, 34  
Worcestershire WOR 18 6C 9D 29, 33  
Warwickshire WAR 16 6D 9C 31 - 34  
Leicestershire LEI 15 7A 3A 6  
Lincolnshire LIN 14 7A 3B 7  
Rutland RUT 15 7A 3C 6  
Nottinghamshire NTT 15 7B 3C 6, 8  
Derbyshire DBY 19 7B 3A, 10A 6  
Cheshire CHS 19 8A 10A 35, 37, 39  
Lancashire LAN 20 - 21 8B - 8E 10B - 10F 1, 35 - 40  
Yorkshire YKS 22 - 24 9A - 9D* 14 - 1B, 2A - 2D 2 - 5, 7 *9E does not exist. A Vol ref that looks like 9e will therefore be 9c.
Durham DUR 24 10A 1A 1 - 2  
Cumberland CUL 25 10B 1A 1  
Northumberland/
Westmoreland
NBL

WES

25 10B 1B 1 1 - 2  
Wales WLS 26 - 27 11A - 11B 8A - 8C 24 - 28  

Please note that the 1837 – 1852 registration districts were originally expressed in Roman numerals, as follows:

I=1
II=2
III=3
IV=4
V=5
VI=6
VII=7
VIII=8
IX=9
X=10
XI=11
XII=12
XIII=13
XIV=14
XV=15
XVI=16
XVII=17
XVIII=18
XIX=19
XX=20
XXI=21
XXII=22
XXIII=23
XXIV=24
XXV=25
XXVI=26
XXVII=27

Also note that the County boundaries change over time and do not coincide exactly with the Volume numbers.

The GENUKI website has a very useful list of which places are in which registration district from 1837 to 1930.