| # | Tower | No | Year | Materials | Maker | Trusses | Layout |
|---|
| 6451 | Overstone, Northamptonshire, S Nicholas | 1 | 1903 | Timber | John Taylor & Co | 6.A | 3.1 |
| 6452 | Overton, Hampshire, S Mary | 1 | 1908 | Steel | Mears & Stainbank | 8.1.B.a | 6.1 ➔ 8.3 |
| 6453 | Overton, Hampshire, S Mary | 1.1 | 1945 | Steel | Mears & Stainbank | 8.1.B.a | 2.X2 |
| 6454 | Overton on Dee, Wrexham, Wales, S Mary V | 1 | 1826 | Oak | James Jacques | 6.A, 6.D & 6.J | 6.X |
| 6455 | Oving, Buckinghamshire, All Saints | 1 | 1887 | Oak | John Warner & Sons | | 3.1 |
| 6456 | Ovingham, Northumberland, S Mary V | 1 | 2011 | Steel | Local labour/guild/assn | | 8.3 |
| 6457 | Owlsmoor, Berkshire, S George | 2 | | Steel | | 8.1.A | |
| 6458 | Owlsmoor, Berkshire, S George | 1 | | Steel | | 8.1.A | |
| 6459 | Owslebury, Hampshire, S Andrew | 1 | 1905 | Cast iron | Mears & Stainbank | 8.3.A.e | 6.1 |
| 6460 | Owston, Leicestershire, S Andrew | 1 | 1860 | Timber | John Taylor & Co | 6.A | |
| 6461 | Owston Ferry, Lincolnshire, S Martin | 1 | 1955 | | Mears & Stainbank | | 8 |
| 6462 | Oxcombe, Lincolnshire, All Saints | 1 | 1925 | Timber | | | |
| 6463 | Oxenhall, Gloucestershire, S Anne | 2 | 1912 | Cast iron | Llewellins & James | 8.3.A.h | 1 |
| 6464 | Oxenhall, Gloucestershire, S Anne | 1 | 1912 | Cast iron | Llewellins & James | 8.3.A.h | 3.3 |
| 6465 | Oxenhope, West Yorkshire, S Mary V | 1 | | Cast iron | | | |
| 6466 | Oxford, Oxfordshire, Cath Ch of Christ | 9 | | Oak | | | 1 |
| 6467 | Oxford, Oxfordshire, Cath Ch of Christ | 2 | 1897 | Cast iron | | | 2 |
| 6468 | Oxford, Oxfordshire, Cath Ch of Christ | 1 | 1872 | Oak | | | 10 |
| 6469 | Oxford, Oxfordshire, Balliol College Historic Collections Centre | 9 | | Timber | | 2.A | |
| 6470 | Oxford, Oxfordshire, Balliol College Historic Collections Centre | 1 | 1904 | Cast iron | John Taylor & Co | 8.3.C.e | 6.4 |
| 6471 | Oxford, Oxfordshire, Carfax Tower | 2 | | | | | |
| 6472 | Oxford, Oxfordshire, Carfax Tower | 1 | 1898 | Cast iron | John Taylor & Co | | 6 |
| 6473 | Oxford, Oxfordshire, Lincoln College | 1 | 1990 | Cast iron & steel | Local labour/guild/assn | | 8.1 |
| 6474 | Oxford, Oxfordshire, Magdalen College | 1 | 1885 | Oak | Whites of Appleton | | 10 |
| 6475 | Oxford, Oxfordshire, Merton College | 1 | 1880 | Oak | Whites of Appleton | | 8 |
| 6476 | Oxford, Oxfordshire, New College | 1 | c1699 | Oak | | | |
| 6477 | Oxford, Oxfordshire, S Aldate | 1 | 1959 | Steel | John Taylor & Co | | 6.2 R |
| 6478 | Oxford, Oxfordshire, S Ebbe | 2 | c1904 | Wrought iron | ? Whites of Appleton | | 4 |
| 6479 | Oxford, Oxfordshire, S Ebbe | 1 | c1904 | Wrought iron | ? Whites of Appleton | | 4 |
| 6480 | Oxford, Oxfordshire, S Giles | 1 | 1907 | Oak | Whites of Appleton | | 8 |
| 6481 | Oxford, Oxfordshire, S John Evan | 9 | | Stone | | 9.A | 1 |
| 6482 | Oxford, Oxfordshire, S John Evan | 1 | 1932 | Cast iron | John Taylor & Co | 8.3.A.h | 1 |
| 6483 | Oxford, Oxfordshire, S Mary V | 2 | | | | | |
| 6484 | Oxford, Oxfordshire, S Mary V | 1 | 1894 | Cast iron & oak | John Taylor & Co | 7.A.b | 6.1 |
| 6485 | Oxford, Oxfordshire, S Thomas M | 1 | | | | | |
| 6486 | Oxhey, Hertfordshire, S Matthew | 2 | | Timber | | | |
| 6487 | Oxhey, Hertfordshire, S Matthew | 1 | | Timber | | | |
| 6488 | Oxhill, Warwickshire, S Lawrence | 8 | 1878 | Cast iron | Thomas Mallaby | 9.F | |
| 6489 | Oxhill, Warwickshire, S Lawrence | 1 | 1878 | Timber | Thomas Mallaby | 6.A | 5.X14 |
| 6490 | Oxted, Surrey, S Mary | 1 | 1923 | | Mears & Stainbank | | |
| 6491 | Oxton, Merseyside, S Saviour | 1 | 1895 | Metal | John Taylor & Co | | |
| 6492 | Oxton, Nottinghamshire, S Peter & S Paul | 1 | 1986 | Steel | | 8.1.F.e | 6.5 |
| 6493 | Packington, Leicestershire, Holy Rood | 1 | 1954 | Cast iron | John Taylor & Co | 8.3.A.h | 6.1 |
| 6494 | Packwood, Warwickshire, S Giles | 2 | 1957 | Cast iron | John Taylor & Co | | 3 |
| 6495 | Packwood, Warwickshire, S Giles | 1 | 1957 | Cast iron | John Taylor & Co | | 5 |
| 6496 | Padbury, Buckinghamshire, S Mary V | 1 | 1962 | Cast iron | Whites of Appleton | 8.3.A.h | 6.1 |
| 6497 | Paddington, Greater London, S Stephen, Westbourne Park | 1 | | Timber | | 6.A | 1 |
| 6498 | Padstow, Cornwall, S Petroc | 1 | 1922 | Metal | William Aggett and Sons | | |
| 6499 | Padworth, Berkshire, S John Bapt | 1 | 1890 | Oak | Mears & Stainbank | | |
| 6500 | Pagham, West Sussex, S Thomas a Becket | 1 | | Cast iron | | | |