| # | Tower | No | Year | Materials | Maker | Trusses | Layout |
|---|
| 6201 | Offord D'Arcy, Cambridgeshire, S Peter | 2 | c1620 | Oak | | 6.S.4 | 2.X1 |
| 6202 | Offord D'Arcy, Cambridgeshire, S Peter | 1 | c1620 | Oak | | 6.S.4 | 2.X1 |
| 6203 | Offton, Suffolk, S Mary | 2 | 1959 | Cast iron | John Taylor & Co | 8.3.C.e | 6.4 |
| 6204 | Offton, Suffolk, S Mary | 1 | 1983 | Steel | John Taylor & Co | | |
| 6205 | Offton, Suffolk, S Mary | 1.1 | | | | | |
| 6206 | Offwell, Devon, S Mary V | 1 | 1952 | Cast iron | John Taylor & Co | 8.3.A.h | 6.1 |
| 6207 | Ogbourne St Andrew, Wiltshire, S Andrew | 1 | 1914 | Cast iron & timber | T Doble & Son | 7.A.a | 5.1 |
| 6208 | Ogbourne St George, Wiltshire, S George | 1 | 1923 | Cast iron & steel | Gillett & Johnston | 8.3.C.e | |
| 6209 | Okeford Fitzpaine, Dorset, S Andrew | 1 | 1906 | Cast iron | Mears & Stainbank | 8.3.A.e | 6.5 |
| 6210 | Okehampton, Devon, All Saints | 1 | 1937 | Cast iron | Gillett & Johnston | 8.3.A.m | 8.3 |
| 6211 | Okehampton, Devon, S James | 1 | | Steel | | 8.1.A | |
| 6212 | Old, Northamptonshire, S Andrew | 1 | | Timber | | 6.A & 6.B | 5.5 D |
| 6213 | Old Bolingbroke, Lincolnshire, S Peter & S Paul | 1 | 1897 | Cast iron | John Taylor & Co | | 6.4 |
| 6214 | Old Brampton, Derbyshire, S Peter & S Paul | 1 | 1887 | Pine | John Taylor & Co | | 6.4 |
| 6215 | Old Clee, Lincolnshire, Holy Trinity & S Mary V | 1 | 1900 | Cast iron | John Taylor & Co | | |
| 6216 | Old Cleeve, Somerset, S Andrew | 1 | 1884 | Oak | | | |
| 6217 | Old Fletton, Cambridgeshire, S Margaret | 2 | 1953 | Cast iron | John Taylor & Co | 8.3.A.h | 2.X1 |
| 6218 | Old Fletton, Cambridgeshire, S Margaret | 1 | 1953 | Cast iron | John Taylor & Co | 8.3.A.h | 4.3 |
| 6219 | Old Hill, West Midlands, Holy Trinity | 1 | 1947 | Cast iron | Gillett & Johnston | 8.3.A.m | 8.3 |
| 6220 | Old Leake, Lincolnshire, S Mary | 1 | 1671 | Timber | | 6.B | |
| 6221 | Old Malton, North Yorkshire, S Mary V | 1 | c1880 | Timber | Local labour/guild/assn | 5.A | 3.1 |
| 6222 | Old Milverton, Warwickshire, S James | 1 | c1880 | Timber | | | |
| 6223 | Old Newton, Suffolk, S Mary | 1 | 1896 | Oak | Alfred Bowell | 6.A | 6.4 |
| 6224 | Old Radnor, Powys, Wales, S Stephen | 1 | c1799 | Oak | | | |
| 6225 | Old Swinford, West Midlands, S Mary | 2 | 1959 | Cast iron | John Taylor & Co | | |
| 6226 | Old Swinford, West Midlands, S Mary | 1 | 1959 | Cast iron | John Taylor & Co | | |
| 6227 | Old Warden, Bedfordshire, S Leonard | 1 | 1899 | Cast iron | John Taylor & Co | 8.3.C.e | 6.4 |
| 6228 | Old Weston, Cambridgeshire, S Swithun | 1 | c1699 | Oak | | 6.B | 4.3 |
| 6229 | Old Whittington, Derbyshire, S Bartholomew | 1 | | Timber | | | 6 |
| 6230 | Old Windsor, Berkshire, S Peter & S Andrew | 1 | 1890 | Oak | Mears & Stainbank | | |
| 6231 | Old Wolverton, Buckinghamshire, Holy Trinity | 1 | c1820 | Timber | | 6.B & 6.D | 6.X |
| 6232 | Oldberrow, Warwickshire, S Mary | 2 | 1875 | Timber | ? (unidentified) | | |
| 6233 | Oldberrow, Warwickshire, S Mary | 1 | 1875 | Timber | ? (unidentified) | | |
| 6234 | Oldbury, West Midlands, Christ Church | 2 | 1887 | Timber | John Warner & Sons | 6.S | 4.3 |
| 6235 | Oldbury, West Midlands, Christ Church | 1 | 1887 | Timber | John Warner & Sons | 6.S | 4.3 |
| 6236 | Oldham, Greater Manchester, S Mary | 3 | 1922 | Cast iron | John Taylor & Co | 8.3.A.h | 4.5 ➔ 5.X |
| 6237 | Oldham, Greater Manchester, S Mary | 3.1 | 1983 | Cast iron | John Taylor & Co (Bellfounders) Ltd | 8.3.A.h | 1 |
| 6238 | Oldham, Greater Manchester, S Mary | 2 | 1922 | Cast iron | John Taylor & Co | 8.3.C.e | 5.1 |
| 6239 | Oldham, Greater Manchester, S Mary | 1 | 1922 | Cast iron | John Taylor & Co | 8.3.C.e | 3.3 |
| 6240 | Oldland, Gloucestershire, S Anne | 1 | | Stone | | 9.A | 1 |
| 6241 | Ollerton, Nottinghamshire, S Giles | 1 | | Timber | | 6.B | 1 |
| 6242 | Olney, Buckinghamshire, S Peter & S Paul | 1 | 2009 | Cast iron | Whites of Appleton | | |
| 6243 | Olveston, Gloucestershire, S Mary V | 1 | 1907 | Composite | John Sully | 7.A.a ? | 8.3 |
| 6244 | Ombersley, Worcestershire, S Andrew | 1 | 1828 | Timber | ? Jacques family | 6.A & 6.I | 6.X |
| 6245 | Onibury, Shropshire, S Michael & All Angels | 1 | 1626 | Timber | | 6.A | 4.1 |
| 6246 | Orange, New South Wales, Australia, Holy Trinity | 1 | 2005 | Steel | Ron Shepherd | 8.1.B.a | 8.3 |
| 6247 | Orby, Lincolnshire, All Saints | 1 | 1921 | Steel | Mears & Stainbank | | |
| 6248 | Orchard Portman, Somerset, S Michael | 1 | 1746 | Oak | William Duck | | |
| 6249 | Orcheston, Wiltshire, S Mary | 1 | | Timber | | | |
| 6250 | Orcop, Herefordshire, S John Bapt | 1 | 1907 | Oak | William Greenleaf | 6.A | 5.X |