4 Digits (43xx)
| Road | From | To | Notes |
|---|---|---|---|
| B4301 | A484 at Bronwydd | A485 at Pontarsais | |
| B4302 | A483 near Llandelio | A462 near Crugybar | |
| B4303 | A476 near Felinfoel | B4297 near Penceiliogi | |
| B4304 | A484/A4138 at Parc Trostre | A484 in Sandy, west Llanelli | number shared by three roads radiating from roundabout at grid reference SS512984 |
| B4304 | A484 in central Llanelli | B4304 at Morfa | |
| B4306 | A4138 in Hendy | B4309 near Bancycapel | |
| B4308 | B4309 at Llanelli | A484 near Kidwelly | |
| B4309 | A484 in central Llanelli | A484 near Cwmffrwd | |
| B4314 | A4066 in Pendine | A40 at Robeston Wathen | |
| B4337 | A487 at Llanrhystud, Ceredigion | B4302 near Llansawel, Carmarthenshire | |
| B4355 | A44 at Kington, Herefordshire | A483 at Dolfor, Powys | Crosses A488 at Knighton |
| B4356 | Presteigne, Powys | A483 at Llanbister, Powys | |
| B4357 | A44 near Kington, Herefordshire | B4355 near Knighton, Powys | |
| B4358 | A483 at Beulah, Powys | A4081 near Llandrindod Wells, Powys | |
| B4360 | A44 at Leominster, Herefordshire | A4110 | |
| B4361 | A49 at Ludlow, Shropshire | A49 at Leominster, Herefordshire | |
| B4362 | A49/A456 at Brimfield, Herefordshire | A44 near Kington, Herefordshire | |
| B4363 | A454 at Bridgnorth, Shropshire | A4117 at Cleobury Mortimer, Shropshire | |
| B4364 | Bridgnorth, Shropshire | A4117 near Ludlow, Shropshire | |
| B4365 | A49 at Ludlow, Shropshire | B4368 at Corfton, Shropshire | Crosses over the tracks of Ludlow Racecourse - traffic is stopped when course is in use |
| B4366 | A4086 at Caernarfon | A4244 / B4547 | |
| B4367 | B4368 near Craven Arms, Shropshire | A4113 at Bucknell, Shropshire | |
| B4368 | A458 near Bridgnorth, Shropshire | A483 at Abermule, Powys | Crosses A49 (at Craven Arms), A488 and A489 |
| B4369 | B4367 at Broome, Shropshire | B4368 at Aston on Clun, Shropshire | 0.5 miles long |
| B4370 | A49 at Marshbrook, Shropshire | A489 at Horderley, Shropshire | The northern section from Little Stretton to All Stretton was renumbered to B5477 in 2004 |
| B4371 | A458 at Much Wenlock, Shropshire | B5477 in Church Stretton town centre, Shropshire | Intersects with the A49 at Church Stretton |
| B4372 | A44 at New Radnor, Powys | B4357 | |
| B4373 | B5060 at Donnington, Telford, Shropshire | Bridgnorth, Shropshire | Goes through Ironbridge Gorge |
| B4375 | B4373 at Broseley, Shropshire | B4376 near Much Wenlock, Shropshire | |
| B4376 | B4373 at Broseley, Shropshire | A458 at Much Wenlock, Shropshire | |
| B4378 | A458 at Much Wenlock, Shropshire | B4368 at Shipton, Shropshire | |
| B4380 | A4169 near Ironbridge, Shropshire | A5 at Montford Bridge, Shropshire | Passes through the south and west of Shrewsbury |
| B4381 | A490/A458 at Welshpool, Powys | B4388 near Welshpool | |
| B4382 | B4389 near Llanfair Caereinion, Powys | B4393 near Lake Vyrnwy, Powys | Crosses A495 |
| B4383 | A488 near Bishop's Castle, Shropshire | A489 near Bishop's Castle, Shropshire | 1 mile long |
| B4384 | A488 at Bishop's Castle, Shropshire | B4385 at Bishop's Castle, Shropshire | Schoolhouse Lane; less than 0.5 miles long |
| B4385 | A4113 at Leintwardine, Shropshire | A458 near Llanfair Caereinion | Passes through Montgomery, Powys; crosses A488, A489 and A483 |
| B4386 | A458/A488 at Shrewsbury | A483 at Abermule, Powys | 26 miles long; crosses A5 and A490 |
| B4387 | A488 at Minsterley, Shropshire | A458 at Halfway House, Shropshire | |
| B4388 | Montgomery, Powys | A458 near Welshpool, Powys | Crosses A490 |
| B4389 | A495 near Llanfair Caereinion, Powys | A483 near Newtown, Powys | Crosses A458 |
| B4390 | A483 at Berriew, Powys | B4389 | |
| B4391 | A490 near Llanfyllin, Powys | A494 at Bala, Gwynedd | |
| B4392 | A483 at Arddleen, Powys | A458 at Cyfronydd, Powys | Crosses A490 |
| B4393 | A458 at Ford, Shropshire | Lake Vyrnwy | Crosses A483 and A495; encircles Lake Vyrnwy |
| B4394 | A442 at Wellington, Shropshire | B4380 at Wroxeter | Crosses A5 |
| B4395 | A458 at Llangadfan, Powys | B4393 near Lake Vyrnwy | |
| B4396 | A5 at Nesscliffe, Shropshire | B4393 near Lake Vyrnwy | Crosses A483 and A495 |
| B4397 | B4396 at Knockin, Shropshire | B5063 near Wem, Shropshire | |
| B4398 | B4396 at Knockin, Shropshire | B4393 Llansantffraid, Powys |
Read more about this topic: B Roads In Zone 4 Of The Great Britain Numbering Scheme