| Manchester Withington | England | E14001354 |
| Mansfield | England | E14001355 |
| Melksham and Devizes | England | E14001356 |
| Melton and Syston | England | E14001357 |
| Meriden and Solihull East | England | E14001358 |
| Merthyr Tydfil and Aberdare | Wales | W07000099 |
| Mid and South Pembrokeshire | Wales | W07000100 |
| Mid Bedfordshire | England | E14001359 |
| Mid Buckinghamshire | England | E14001360 |
| Mid Cheshire | England | E14001361 |
| Mid Derbyshire | England | E14001362 |
| Mid Dorset and North Poole | England | E14001363 |
| Mid Dunbartonshire | Scotland | S14000097 |
| Mid Leicestershire | England | E14001364 |
| Mid Norfolk | England | E14001365 |
| Mid Sussex | England | E14001366 |
| Mid Ulster | Northern Ireland | N05000010 |
| Middlesbrough and Thornaby East | England | E14001367 |
| Middlesbrough South and East Cleveland | England | E14001368 |
| Midlothian | Scotland | S14000045 |
| Milton Keynes Central | England | E14001369 |
| Milton Keynes North | England | E14001370 |
| Mitcham and Morden | England | E14001371 |
| Monmouthshire | Wales | W07000101 |
| Montgomeryshire and Glyndwr | Wales | W07000102 |
| Moray West, Nairn and Strathspey | Scotland | S14000098 |
| Morecambe and Lunesdale | England | E14001372 |
| Motherwell, Wishaw and Carluke | Scotland | S14000099 |
| Na h-Eileanan an Iar | Scotland | S14000027 |
| Neath and Swansea East | Wales | W07000103 |
| New Forest East | England | E14001373 |
| New Forest West | England | E14001374 |
| Newark | England | E14001375 |
| Newbury | England | E14001376 |
| Newcastle upon Tyne Central and West | England | E14001377 |
| Newcastle upon Tyne East and Wallsend | England | E14001378 |
| Newcastle upon Tyne North | England | E14001379 |
| Newcastle-under-Lyme | England | E14001380 |
| Newport East | Wales | W07000104 |
| Newport West and Islwyn | Wales | W07000105 |
| Newry and Armagh | Northern Ireland | N05000011 |
| Newton Abbot | England | E14001381 |
| Newton Aycliffe and Spennymoor | England | E14001382 |
| Normanton and Hemsworth | England | E14001383 |
| North Antrim | Northern Ireland | N05000012 |
| North Ayrshire and Arran | Scotland | S14000048 |
| North Bedfordshire | England | E14001384 |
| North Cornwall | England | E14001385 |
| North Cotswolds | England | E14001386 |
| North Devon | England | E14001387 |
| North Dorset | England | E14001388 |
| North Down | Northern Ireland | N05000013 |
| North Durham | England | E14001389 |
| North East Cambridgeshire | England | E14001390 |
| North East Derbyshire | England | E14001391 |
| North East Fife | Scotland | S14000100 |
| North East Hampshire | England | E14001392 |
| North East Hertfordshire | England | E14001393 |
| North East Somerset and Hanham | England | E14001394 |
| North Herefordshire | England | E14001395 |
| North Norfolk | England | E14001396 |
| North Northumberland | England | E14001397 |
| North Shropshire | England | E14001398 |
| North Somerset | England | E14001399 |
| North Warwickshire and Bedworth | England | E14001400 |
| North West Cambridgeshire | England | E14001401 |
| North West Essex | England | E14001402 |
| North West Hampshire | England | E14001403 |
| North West Leicestershire | England | E14001404 |
| North West Norfolk | England | E14001405 |
| Northampton North | England | E14001406 |
| Northampton South | England | E14001407 |
| Norwich North | England | E14001408 |
| Norwich South | England | E14001409 |
| Nottingham East | England | E14001410 |
| Nottingham North and Kimberley | England | E14001411 |
| Nottingham South | England | E14001412 |
| Nuneaton | England | E14001413 |
| Old Bexley and Sidcup | England | E14001414 |
| Oldham East and Saddleworth | England | E14001415 |
| Oldham West, Chadderton and Royton | England | E14001416 |
| Orkney and Shetland | Scotland | S14000051 |
| Orpington | England | E14001417 |
| Ossett and Denby Dale | England | E14001418 |
| Oxford East | England | E14001419 |
| Oxford West and Abingdon | England | E14001420 |
| Paisley and Renfrewshire North | Scotland | S14000101 |
| Paisley and Renfrewshire South | Scotland | S14000102 |
| Peckham | England | E14001421 |
| Pendle and Clitheroe | England | E14001422 |
| Penistone and Stocksbridge | England | E14001423 |
| Penrith and Solway | England | E14001424 |
| Perth and Kinross-shire | Scotland | S14000103 |
| Peterborough | England | E14001425 |
| Plymouth Moor View | England | E14001426 |
| Plymouth Sutton and Devonport | England | E14001427 |
| Pontefract, Castleford and Knottingley | England | E14001428 |
| Pontypridd | Wales | W07000106 |
| Poole | England | E14001429 |
| Poplar and Limehouse | England | E14001430 |
| Portsmouth North | England | E14001431 |
| Portsmouth South | England | E14001432 |
| Preston | England | E14001433 |
| Putney | England | E14001434 |
| Queen's Park and Maida Vale | England | E14001435 |
| Rawmarsh and Conisbrough | England | E14001436 |
| Rayleigh and Wickford | England | E14001437 |
| Reading Central | England | E14001438 |
| Reading West and Mid Berkshire | England | E14001439 |
| Redcar | England | E14001440 |
| Redditch | England | E14001441 |
| Reigate | England | E14001442 |
| Rhondda and Ogmore | Wales | W07000107 |
| Ribble Valley | England | E14001443 |
| Richmond and Northallerton | England | E14001444 |
| Richmond Park | England | E14001445 |
| Rochdale | England | E14001446 |
| Rochester and Strood | England | E14001447 |
| Romford | England | E14001448 |
| Romsey and Southampton North | England | E14001449 |