# List of B roads in Northern Ireland

A List of B roads in Northern Ireland.
Routes are listed proceeding North to South or East to West as appropriate.
| Road | From | To | Route |
| B1 | A25 Market Street, Downpatrick | A2, junction of Strangford Road and Bath Street, Ardglass | St Patrick's Avenue/Killough Road/Ardglass Road/Downpatrick Road |
| B2 | A28 in Loughgilly | East spur: A7 Belfast Road near Downpatrick South spur: A28 Gosford Road near Mullaghmore | via Derrytrasna, Derryadd and Derrymacash to Lurgan, then: East spur: via Gamblestown, Dromore, Ballykeel, Ballynahinch and Annacloy South spur: via Ballynaghy, Tandragee and Clare |
| B3 | Border (continuing R214 from N2 Castleshane) | North spur: A26 at Lurgan South spur: A25 at Rathfriland | via Derrynoose, Keady, Tassagh, Markethill, Tandragee, multiplexes with A51 to Gilford, then: North spur: via Bleary and Corcreeny South spur: via Scarva and Loughbrickland |
| B4 | A35 at Kesh | A505 at Cookstown | via Ederney, Lack, multiplexes with A32 to Omagh, Drumnakilly, Carrickmore and Pomeroy |
| B5 | A20 Newtownards Road, Greyabbey | A2 Main Street, Ballywalter | Main Street/Church Street/Ballywalter Road/Greyabbey Road |
| B6 | A49 near Lisburn | A22 at Killyleagh | via Saintfield, Darragh Cross, Raffrey, Derryboy and Shrigley |
| B7 | A2 at Warrenpoint | B6 at Shrigley | via Burren, Mayobridge, Rathfriland, Ballyroney, Moneyslane, Lowtown, Finnis, Dromara, Ballynahinch, Listooder and Crossgar |
| B8 | A25 near Newry | A25 near Kilcoo | via Mayobridge and Hilltown |
| B9 | A26 near Waringstown | A3 at Magheralin | via Donaghcloney |
| B10 | B3 at Scarva | A25 at Rathfriland | via Banbridge and Annaclone |
| B12 | A52 at Crumlin | A3 at Lurgan | via Glenavy, Lower Ballinderry, Aghalee and Aghagallon Originally ran from the A26 in Glenavy to the A3 in Moira. Swapped with the A26 after the M1 was built; the southern end (at Moira) is now part of the B105 after it was bypassed. |
| B13 (defunct) | B39 at Clady Corner | A26 near Crumlin | Upgraded to the western half of the A52 in the late 1920s. |
| B14 | A43 near Cargan | A2 at Cushendall | via Tully |
| B15 | B16 near Ballymoney | A2 near Ballintoy | via Armoy, Ballycastle, Carnduff and Ballintoy |
| B16 | B66 at Ballymoney | A44 near The Drones | via Dunaghy and Kilraghts |
| B17 | A29 at Coleraine | A2 near Ballycastle | via Revallagh and Bushmills |
| B18 | B73 at Coagh | A532 at Ballymena | via Moneymore, Loup, Drumenagh, Ballyronan, Toome, Moneyglass and Whiteside's Corner |
| B19 (defunct) | A26 in Ballymena | A6 in Maghera | Renumbered as a portion of the A42 in the mid 1920s. |
| B19 (defunct) | A2 north of Eglinton | Eglinton railway station | Declassified by the late 1940s. |
| B20 | A2 at Craigavad | B21 at Bangor | via Crawfordsburn |
| B21 | B20 at Bangor | A48 west of Donaghadee | Donaghadee Road/High Bangor Road Originally continued to the A2 in Donaghadee town center, but this became a portion of the A48 in the mid-1920s. |
| B22 (defunct) | A21 Zion Place, Newtownards | B21 at Donaghadee | Upgraded to the A48 in the mid-1920s. |
| B23 | A49, junction of Sloan Street and Saintfield Road, Lisburn | A1, junction of Lisburn Road and Bradbury Place, Belfast | via Hillhall, Ballycarn and Ballylesson; Mercer Street/Hillhall Road/Ballylesson Road then Malone Road from its junction with Balmoral Avenue/University Road |
| B24 (defunct) | B6 in Lisburn | A6 in Ballynahinch | Upgraded to the A49 in the mid-1920s. After the A49 was rerouted due to completion of the M1, a 1 mile section west of the M1 became a portion of the B177 and the remainder declassified (now C297). Only the section in Ballynahinch is still part of the A49. |
| B25 | A1 near Dromore | A2 at Rostrevor | via Katesbridge, Rathfriland and Hilltown |
| B26 (defunct) | A2 in Newcastle | A1 (now A26) in Banbridge | Upgraded to Class I status as a portion of the A50 in the mid-1920s. |
| B27 | B8 at Hilltown | A2 at Kilkeel | |
| B28 | A29 at Charlemont | A50 at Portadown | via Ardress and Drumharriff; Garvaghy Road |
| B29 (defunct) | A28 Scotch Street, Armagh | A27 in Tandragee | Upgraded to Class I status as a portion of the A51 in the mid-1920s. |
| B30 | A25 near Camlough | Border (continues as R179 to Kingscourt) | via Lislea, Silverbridge, Creggan, Crossmaglen and Cullaville |
| B31 | A29 at Armagh | A29 at Newtownhamilton | via Lisnadill |
| B32 | B3 at Keady | Border (continues as R181 to R178 Shercock) | Castleblayney Road via Carnagh |
| B33 (defunct) | B3 near Derrynoose | Border at Bree (continued as the L145) | Became a portion of a rerouted B3 in the 1940s. |
| B34 | A29 at Dungannon | B106 at Laghey Corner | Killyman Road |
| B35 | A45 at Granville | A28 at Aughnacloy | via Carnteel and Greystone |
| B36 | A34 at Donagh | Border (continues as R187 to N54 at Monaghan) | via Rosslea |
| B37 (defunct) | L24 (now N3) in Belleek | L24 (now N3) near Belturbet | Section north of Enniskillen was upgraded to Class I status as the A46 in the mid-1920s. The southern section remained a B-road because it did not lead to an approved border crossing, but it became the A509 in the 1960s. |
| B37 (defunct) | Central Belfast | A30 at Stonyford | Created in 1924 or 1925, despite the existence of the other B37. Upgraded to the A501 by the end of the 1920s. |
| B38 | B12, junction of Main Street and Crumlin Road, Glenavy | A1, junction of Great Victoria Street and Fisherwick Place, Belfast | via Hannahstown; Belfast Road/Hannahstown Road/Upper Springfield Road then Springfield Road from its junction with West Circular Road/Grosvenor Road |
| B39 | A26 Oldstone Road, Antrim | A6 Royal Avenue, Belfast | Seven Mile Straight/Ballyutoag Hill then Woodvale Road/Shankill Road/Peter's Hill/North Street |
| B40 | B74 Main Street, Feeny | North spur: A6 Castledawson Roundabout near Castledawson South Spur: A31 Moneymore Road Roundabout near Magherafelt | via Moneyneany, Draperstown and Desertmartin; Glenedra Road/Moneyneany Road/Derrynoyd Road/Magherafelt Road/Draperstown Road then Rosure Road/Desertmartin Road/Rainey Street North spur: Broad Street/Church Street/Castledawson Road/Magherafelt Road South Spur: Queen Street/Moneymore Road |
| B41 | B40 Old Cross Roundabout, Draperstown | A29 Maghera Road, Tobermore | Tobermore Road/Draperstown Road/Main Street |
| B42 | A6 Glenshane Road near Maghera | B40 junction of Desertmartin Road and Rainey Street, Magherafelt | via Lisnamuck and Tobermore; Lisnamuck Road then Magherafelt Road/Grange Road/Tobermore Road |
| B43 | B4 at Pomeroy | A45 at Dungannon | via Donaghmore and Aghareaney |
| B44 | B40 at Feeny | B74 near Feeny | Altinure Road |
| B45 | A45 at Dungannon | Border (continues as R185 to N12 near Monaghan) | via Eglish and Caledon |
| B46 | A5 at Newtownstewart | A32 at Enniskillen | via Gortin, Rousky, Creggan, Carrickmore, Sixmilecross, Beragh, Seskinore, Fintona, Dromore Trillick, Kilskeery and Ballinamallard |
| B47 | B46 at Newtownstewart | B40 at Draperstown | via Plumbridge, Cranagh, Sperrin and Straw |
| B48 | A5 at Newbuildings | A5 at Omagh | via Donemana, Ballynamallaght, Plumbridge and Gortin |
| B49 | A5 at Strabane and Ballymagorry | B74 at Claudy | via Artigarvan, Donemana and Ballyneaner |
| B50 | A5 Omagh western bypass | B72 at Castlederg | via Drumquin; originally continued north out of Castlederg to the L16 (now R235) at the border, but this was declassified after the mid-1970s. |
| B51 | | | Unused |
| B52 | A42 at Portglenone | A6 at Randalstown | via Chesney's Corner |
| B52 | A46 at Belleek | A32 at Florencecourt | via Drumlisaleen, Garrison and Holywell; duplicate number. Originally ended at Belcoo, but was extended to Florencecourt in 2013. |
| B53 | A6 at Randalstown | A36 at Moorfields | via Kells and Moorfields |
| B53 | B52 at Garrison | Bridge over County River at border (becomes R282 to Manorhamilton) | |
| B54 | | | Unused |
| B55 (defunct) | Portrush railway station | Portrush town center | Ran along Kerr Street; declassified after the A29 was rerouted. |
| B56 | A57 near Ballyclare | A8 at Corr's Corner Roundabout | via Ballypalady |
| B57 (defunct) | A8 at Ballynure | A6 at Templepatrick | Upgraded to Class I status after the 1960s as the A57, probably due to construction of the N2. |
| B58 | A8 at Ballynure | A2 at Carrickfergus | Carrickfergus Road/New Line Road/Prospect Road |
| B59 | A36 at Ballymena | A2 at Whitehouse | via Doagh and Ballypalady |
| B60 (defunct) | A26 in Ballymena | A2 in Carnlough | Upgraded to Class I status as a portion of the A42 in the mid-1920s. |
| B61 (defunct) | B60 (now A42) in Ballymena | A2 at Glenariff | Upgraded to Class I status as a portion of the A43 in the mid-1920s. |
| B62 | A2 at Portrush | A26 at Ballymena | via Ballybogy, Ballymoney, Finvoy, Rasharkin and Cullybackey |
| B63 (defunct) | A26 in Cloughmills | A2 at Ballycastle | Upgraded to Class I status as a portion of the A44 in the mid-1920s. |
| B64 | A6 at Dungiven | A43 at Martinstown | via Brockagh, Garvagh, Kilrea, McLaughlin's Corner, Rasharkin, Glenvale, Glarryford, Clogh and Newtowncrommelin |
| B65 (defunct) | A29 in Coleraine | A6 east of Castledawson | Upgraded to Class I status as a portion of the A54 in the mid-1920s. |
| B66 | A37 at Limavady | A2 at Bushmills | via Ringsend, Aghadowey, Agivey, Bendooragh, Milltown, Ballymoney, Dervock, Derrykeighan and Castlecat |
| B67 | A29 at Coleraine | A44 at Ballycastle | via Ballybogy, Derrykeighan, Toberdoney, Moss-Side and The Dry Arch |
| B68 | B69 at Limavady | A6 at Dungiven | via Scriggan |
| B69 | B74 at Claudy | A2 near Bellarena | via Crindle |
| B70 | B66 at Ringsend | B62 near Rasharkin | via Ballerin; multiplexes with B64 from Garvagh to McLaughlin's Corner |
| B71 (defunct) | A2 Craigavon Bridge near Derry | Border at Killea | Much of route upgraded to Class I status as a portion of the A40 in the mid-1920s. The section running to Killea was bypassed and declassified, but it became a portion of the B193 a few years later. |
| B72 | A5 at Strabane | B82 near Killadeas | via Victoria Bridge, Erganagh, Castlederg, Castlegore, Killen and Ederney |
| B73 | A29 at Cookstown | Lough Neagh at Moortown | via Drummullan and Coagh |
| B74 | A6 near Claudy | A6 at Dungiven | via Claudy, Craigdarragh and Feeny |
| B75 | A29 near Maghera | B64 at Kilrea | via Upperlands |
| B76 | M1 J10 near Lurgan | B2 Derrymacash Road | Kinnego Embankment |
| B77 | A29 at Armagh | A4 at Portadown | via Loughgall |
| B78 | A50 at Portadown | A29 at Newtownhamilton | via Teemore, Mullaghbrack, Markethill and Clady Milltown |
| B79 | Bridge Street, Newry | Merchant's Quay, Newry | Dominic Street/Patrick Street/Upper Edward Street/Corry Square |
| B80 | A4 at Enniskillen | B46 at Fintona | via Garvary, Tempo and Imeroo |
| B81 | A46 near Derrygonnelly | A4 near Enniskillen | via Derrygonnelly and Monea |
| B82 (defunct) | A32 near Enniskillen Airport | A35 south of Kesh | Renumbered as an eastern extension of the A47 in 2013. |
| B83 | A5 at Omagh | Border (continues as R186 to N54 Monaghan) | via Seskinore, Eskra and Clogher |
| B84 | A5 at Newtownstewart | A32 at Dromore | via Drumquin and Milltown |
| B85 | B165 at Clady | B72 at Strabane | Urney Road |
| B86 | B66 at Dervock | B67 at Toberdoney | Toberdoney Road |
| B87 | | | Unused |
| B88 (defunct) | B126 North Queen Street, Belfast | A2 York Street, Belfast | Frederick Street; now part of the A11. |
| B89 | | | Unused |
| B90 | A8 at Mossley | near Ballylumford | via Greenisland, Ballycarry and Ballylumford |
| B91 | | | Unused |
| B92 | A2 Loughareema Road | A2 Tromra Road | via Cushendun |
| B93 | B52 at Randalstown | A26 at Cloughmills | via Whiteside's Corner, Ahoghill, Cullybackey, Craigs and Glarryford |
| B94 | A26 at Cloughmills | B95 at Ballyclare | via Cloughmills, Clogh, McGregor's Corner, Quarrytown, Broughshane and Five Corners |
| B95 | B518 at Antrim | North spur: M2 Junction 6 South spur: A8 near Mossley East spur: B58 near Straid | via Parkgate, Doagh and Straid |
| B96 | B64 at Rasharkin | B93 at Cullybackey | via Aughnacleagh, Portglenone and Dreen |
| B97 | A42 at The Sheddings | A2 at Glenarm | Munie Road/Straidkelly Road |
| B98 | A26 near Ballymena | B59 at Chapeltown | via Kells, Connor |
| B99 | B58 near Straid | A2 at Glynn | via Ballynure |
| B100 | B99 near Glenoe | A8 at Kilwaughter | Ballyrickard Road |
| B101 | A26 Nutts Corner Roundabout | A30 Lisburn | via Dundrod and Hillview |
| B102 | A512 at Derriaghy | A501 Falls Road, Belfast | Stewartstown Road/Andersonstown Road/Falls Road |
| B103 | A1 at Lambeg | B23 at Drumbeg | Ballyskeagh Road |
| B104 | B12 at Lower Ballinderry | A3 Moira Road, Lisburn | via Upper Ballinderry and Ballymave |
| B105 | B12 at Aghalee | A3 at Moira | Soldierstown Road/Station Road |
| B106 | B128 at Benburb | North spur: A45 at Coalisland South spur: B196 at Tamnamore | via Moy, Laghey Corner and Kingave |
| B107 | B80 near Tempo | A4 at Fivemiletown | via Clabby |
| B108 | A32 Swanlinbar Road | A509 Derrylin Road | via Kinawley |
| B109 (defunct) | A2 in Clandeboyle | A48 at Six Road Ends | Declassified by the late 1940s. |
| B110 (defunct) | A28 east of Caledon | A3 in Middletown | Renumbered to B210 by the mid-1940s for unknown reasons. |
| B111 | B77 at Loughgall | A51 at Hamiltonsbawn | via Richhill |
| B112 | B133 Millvale Road | A25 Camlough Road | through Bessbrook |
| B113 | B134 at Forkhill | A1 at Newry | via Dromintee and Meigh |
| B114 | B3 near Markethill | A27 at Poyntzpass | Tannyoky Road via Eleven Lane Ends and Loughgilly |
| B115 | B45 near Benburb | A29 Railway Street, Armagh | Battleford Road |
| B116 | | | Unused |
| B117 (defunct) | Bessbrook | Newry | |
| B118 | A6 near Drumahoe | A2 near Eglinton | via Eglinton |
| B119 | A2 near Castlerock | A2 near Castlerock | Spur off the A2 to Castlerock |
| B120 | | | Unused |
| B121 (defunct) | B43 in Donaghmore | A4 in Parkanaur | Declassified by the 1940s. |
| B122 | B83 near Omagh | A4 at Fivemiletown | via Fintona |
| B123 | A32 at Irvinestown | B46 at Kilskeery | Old Junction Road |
| B124 (defunct) | A25 west of Newry | B78 in Markethill | The section from Newry to Enagh is now part of the B133, the section from Whitecross to Markethill is now part of the B134, and the central section declassified (later C214). |
| B125 (defunct) | A2 in Donard Park, Newcastle | A50/T2 in Newcastle | Now part of the A2 one-way system. |
| B126 | A1, junction of College Square East and Wellington Place, Belfast | A2 York Road, Belfast | College Square East/College Avenue/Millfield/Carrick Hill/North Queen Street |
| B127 | A34 at Lisnaskea | Border (continues as R205 to R199 near Newtowngore) | - |
| B128 | A5 at Aughnacloy | A29 near Allistragh | via Benburb and Blackwatertown |
| B129 | | | Unused |
| B130 | B45 at Greystone | B128 at Benburb | Derryfubble Road |
| B131 | B106 at Tamnamore | B3 near Clare | via Kilmore, Richhill and Milltown |
| B132 | A3 near Middletown | A29 at Keady | Madden Road |
| B133 | A28 at Markethill | A25 at Bessbrook | via Mountnorris |
| B134 | B78 near Markethill | B113 at Forkhill | via Whitecross, Lislea and Mullaghbawn |
| B135 | A29 near Newtownhamilton | B30 at Crossmaglen | via Cullyhanna |
| B136 | A47 near Boa Island | Border (continues to R232 at Pettigo) | - |
| B137 | | | Unused |
| B138 (defunct) | B37 in Bellanaleck | Bridge over the Cladagh River | Declassified by 1946 (now C438). A 1939 map shows the route ending at the Cladagh River, but this is probably a map error and the route likely continued to the border with County Cavan near Belcoo. If this is the case, the western end is now part of the B52. |
| B139 | | | Unused |
| B140 | B80 near Tempo | B514 at Ballindarragh | via Lisbellaw |
| B141 (defunct) | B140 northeast of Lisbellaw | B80 south of Tempo | Now part of a rerouted B140. |
| B142 (defunct) | B108 southeast of Kinawley | B37 (now A509) | Declassified by 1946 (now C434). |
| B143 | A34 at Newtownbutler | L2101 in Summerhill | via Magheraveely; originally continued to the B36 west of Rosslea, but this section was downgraded in 2013 and is now the C707. |
| B144 | | | Unused |
| B145 | A2 near Portballintrae | A2 near Bushmills | through Portballintrae |
| B146 | A2 at Bushmills | A2 at Dunseverick | via Giant's Causeway |
| B147 | B62 at Ballymoney | A2 near Bushmills | via Kirkhills, Stranocum, The Dry Arch and Lagavara; and Causeway Road via Dunseverick |
| B148 | A8 near Larne | A2 at Drumnagreagh Port | via Carncastle |
| B149 | A2 at Kilroot | B99 Glenoe | via Beltoy |
| B150 | A2 at Whitehead | B90 at Mullaghboy | via Ballystrudder |
| B151 | | | Unused |
| B152 (defunct) | A6 High Street, Antrim | A6/A26 in Antrim | via Antrim railway station; declassified after the 1970s. |
| B153 (defunct) | B95 near Parkgate | A26 in Aldergrove | via Dunadry; reduced to a spur by 1946, running from the then-B101 (now A26) to an unclassified road near Killead. The western end is now gone, lost under Belfast International Airport while the remainder is now part of the A57. Much of the route was declassified (now C110). |
| B154 | A52 near Dundrod | B38 near Hannahstown | via Dundrod |
| B155 (defunct) | A52 Nutts Corner Road northeast of Crumlin | A26 Crumlin Road north of Crumlin | Declassified in the 1970s, probably when the A26 was rerouted. |
| B156 | B12 at Aghagallon | B12 at Glenavy | via Gawley's Gate |
| B157 | | | Unused |
| B158 | B4 at Omagh | B46 at Beragh | Donaghanie Road |
| B159 | | | Unused |
| B160 | B4 at Pomeroy | A31 at Magherafelt | via Stewartstown, Coagh, Ballinderry and Ballyronan |
| B161 | B520 at Coalisland | B160 at Derrycrin | via Killeen, Mourne View and The Diamond |
| B162 | B40 near Moneyneany | A29 at Cookstown | via Labby and Churchtown |
| B163 (defunct) | A32 (now B46) north of Trillick | A5 at Curr | Declassified by 1946. |
| B164 | B72 near Spamount | B164 at Newtownstewart | via Ardstraw |
| B165 | B85 at Clady | A5 at Newtownstewart | via Kennystown, Victoria Bridge and Douglas Bridge |
| B166 (defunct) | B50 (now unclassified) Kilclean Road in Castlederg | L16 at Grousehall | Declassified by 1946 (now C675). |
| B167 | | | Unused |
| B168 | B122 in Fintona | A4 in Clogher | |
| B169 | | | Unused |
| B170 | B505 Holywood Road, Belfast | A2 Belfast Road near Bangor | Belmont Road/Ballymiscaw Road/Whinney Hill/Craigantlet Road/Ballysallagh Road |
| B171 | | | Unused |
| B172 | A48 at Newtownards | A2 at Millisle | Movilla Road/Ballyblack Road East/Moss Road |
| B173 | A20 at Kircubbin | A2 at Cloghy | via Rubane |
| B174 | | | Unused |
| B175 | A24 at Ballynahinch | A25 at Annsborough | via Spa and Drumaroad |
| B176 | A25 at Downpatrick | A2 to Killough | via Ballygilbert |
| B177 | A1 at Hillsborough | A49 at Ballynahinch | via Annahilt |
| B178 | B177 at Hillsborough | A21 near Comber | via Carryduff and Moneyrea |
| B179 | | | Unused |
| B180 | B27 at Hilltown | North spur: A2 at Dundrum South spur: A2 at Newcastle | via Bryansford |
| B181 | B160 near Magherafelt | Coagh | via The Loup |
| B182 | A42 at Gulladuff | A6 near Toome | via Bellaghy |
| B183 | A6 at Randalstown West junction | A6 at Drumderg Roundabout, Toome | Moneynick Road |
| B184 | | | Unused |
| B185 | A2 in Portstewart | A29 in Coleraine | |
| B186 | A37 at Macosquin | B66 at Ringsend | Cashel Road |
| B187 (defunct) | A29 in Coleraine | B66 in Aghadowey | Declassified by 1946, but returned to Class II status as a portion of the B207. |
| B188 | B66 at Aghadowey | B207 at Aghadowey | Ballygawley Road |
| B189 (defunct) | A2 in Portrush | B17 in Coleraine | Paralleled the A29; declassified in the early 1930s (now C535). |
| B190 | B70 at Ringsend | B64 at Garvagh | Belraugh Road |
| B191 | | | Unused |
| B192 | B69 at Limavady | A6 at Dungiven | Drumrane Road |
| B193 | A40 at Nixons Corner | Border at Killea (continues as R237 to N13) | - |
| B194 | A2 Buncrana Road, Derry | B521 Glengalliagh Park, Derry | Racecourse Road |
| B195 (defunct) | Blacklion | Mucklagh | Became a portion of the A52 in 2013. |
| B196 | B106 at Tamnamore | M1 Junction 12 | via Mullenakill, Maghery and The Birches |
| B197 | A2 Main Street, Bangor | B511 Groomsport Road, Bangor | Hamilton Road/Ballyholme Road/Ballyholme Esplanade/Sheridan Drive |
| B198 | A2 Belfast Road, Holywood | A2 Bangor Road, Holywood | Holywood High Street |
| B199 - B200 | | | Unused |
| B201 | A2 near Limavady | A29 at Coleraine | Windyhill Road, Carthall Road |
| B202 | A2 near Balarena | Magilligan Point | Point Road |
| B203 - B204 | | | Unused |
| B205 | B23 Ballylesson Road, Drumbeg | B23/A55 Milltown Road | Purbysburn Hill/Hospital Road |
| B206 (defunct) | A4 in Enniskillen | A32 in Drumcoo | Not shown on the 1926 or 1929 maps, but was in existence by 1946, probably gaining its number upon completion. Now upgraded to a portion of the A32. |
| B207 | A29 at Ballylintagh | A54 at Agivey | Moneybrannon Road/Mullaghinch Road |
| B208 (defunct) | B205 in Newtownbreda | Shaw's Bridge, B23 | Upgraded to a portion of the A55. |
| B209 | | | Unused |
| B210 | A28 at Caledon | A3 at Middletown | Coolkill Road |
| B500 (defunct) | Antrim Road, Belfast | Woodvale Road, Belfast | Became a portion of the A52 in the mid-1920s. |
| B501 | A55 North Circular Road, Belfast | A2, junction of York Road and York Street, Belfast | Cavehill Road/Limestone Road |
| B502 | A55 Ballysillan Road, Belfast | A501, junction of Falls Road and Divis Street, Belfast | Oldpark Road/Agnes Street/Northumberland Street |
| B503 | B126, junction of College Avenue and College Square East, Belfast | A1 Lisburn Road, Belfast | College Square North/Durham Street/Sandy Row |
| B504 (defunct) | B503 Sandy Row, Belfast | A42 Ormeau Road, Belfast | Declassified after the 1960s. |
| B505 | Woodstock Road, Belfast | A55, junction of Holywood Road and Parkway, Belfast | Beersbridge Road/Holywood Road |
| B506 | A23 Short Strand, Belfast | A24 Ormeau Road, Belfast | Short Strand/Ravenhill Road |
| B507 | A2 Branch Roundabout, Derry | A2 Carlisle Circus, Derry | Branch Road/Northland Road/Francis Street/Fahan Road/Lecky Road/Barrack Street/Abercorn Road |
| B508 (defunct) | A2 at the Craigavon Bridge, Derry | B71 in Derry | The section along Abercorn Street is now part of a rerouted B507 and the remainder unclassified. |
| B509 | | | Unused |
| B510 (defunct) | B69 south of Crindle | Limavady Junction railway station | Declassified in 1976 after the station closed. |
| B511 | B21 Donaghadee Road, Bangor | A2 junction of Donaghadee Road and Groomsport By-Pass, Groomsport | Groomsport Road/Bangor Road/Main Street/Donaghadee Road |
| B512 | | | Unused |
| B513 | A6 Antrim Road, Whitehouse | A2 Shore Road, Whiteabbey | O'Neill Road/Station Road |
| B514 | A4 at Tamlaght | A34 at Lisnaskea | via Carry Bridge and Drumbughas North; formerly a portion of the A34 before it was rerouted over the A39 to Maguiresbridge. |
| B516 | | | Unused |
| B517 | A29 Moy Road, Moygashel | B34 Killyman Road, Laghey Corner | Far Circular Road |
| B518 | A26 Ballymena Road, Antrim | A6 Belfast Road, Antrim | Stiles Way/Ballycraigy Road |
| B519 | | | Unused |
| B520 | A29 at Cookstown | A45 at Coalisland | via Tullyhogue and Stewartstown |
| B521 | A2 Branch Roundabout, Derry | A515 Madam's Bank Road, Derry | Glengalliagh Road |
| B523 | A2 Limavady Road, Derry | A6 Glendermott Road, Derry | Clooney Terrace/Simpson's Brae and Irish Street/Belt Road |
| B524 | B507 Northland Road, Derry | A2 Buncrana Road, Derry | Lone Moor Road/Infirmary Road/Clarendon Street |
| B525 | B507 Northland Road, Derry | A2 Buncrana Road, Derry | Duncreggan Road/Pennyburn Pass |
| B526 | B194 Racecourse Road, Derry | A2 Culmore Road, Derry | Greenhaw Road |
| B527 | B507 Northland Road, Derry | B507 Lecky Road, Derry | Springtown Road/Creggan Road/Great James Street/Little James Street/Rossville Road |
| B528 | A2 Foyleside Roundabout, Derry | Whittaker Street, Derry | Foyle Street |
| B529 | B524 Infirmary Road, Derry | B527 Little James Street, Derry | Great James Street |
| B530 | A6 Glendermott Road, Derry | A514 Crescent Link, Derry | Rossdowney Road |
| B531 | | | Unused |
| B533 | A34 at Newtownbutler | A3 (N54) at Wattlebridge | The entire stretch of the B533 is officially called the Wattlebridge Road. It formerly formed part of the main road from Enniskillen to Dublin, via Cavan Town. Formerly a portion of the A34 before it was rerouted towards Clones. |
| B534 | B82 at Lisnarick | A32 at Irvinestown | Lisnarick Road |
| B535 | B80 at Tempo | A4 at Maguiresbridge | - |
| B536 | B72 at Strabane | B47 at Plumbridge | - |
| B537 - B539 | | | Unused |