| PO Number | Town / Place name | Code |
|---|---|---|
| 100 | Botesdale | |
| Ruardean | ||
| 101 | Ixworth | |
| Alnmouth | ||
| 102 | Woolpit Leyton | |
| 103 | Bourn | |
| Bourne | ||
| 104 | Brackley | |
| 105 | Bracknell | |
| 106 | Bradford, Wilts | |
| 107 | Bradford, Yorks | |
| 108 | Carnarvon | |
| 109 | Walthamstow | |
| 110 | Keighley | |
| 111 | Bingley | |
| 112 | Braintree | |
| 113 | Brampton | |
| 114 | Brandon | |
| 115 | Stoke Ferry | |
| Hillsborough | ||
| 116 | Brecon | |
| 117 | Trecastle | |
| Tottenham | ||
| Trindon Colliery | ||
| 118 | Brentwood | |
| 119 | Edmonton | |
| Trebanos | ||
| 120 | Bridgend, Glam | |
| 121 | Pyle | |
| West Cross | ||
| 122 | Bridgenorth | |
| 123 | Bridgewater | |
| 124 | Bridlington | |
| 125 | Bridlington Quay | |
| 126 | Hunmanby | |
| Spenneymoor | ||
| 127 | Bridport | |
| 128 | Beaminster | |
| St. Ann's Head | ||
| 129 | Brigg | |
| 130 | Castor | |
| 131 | Limber | |
| 132 | Brighton | |
| Alma Terr. Hove Brighton | ||
| Bedford St. Brighton | ||
| Hove B.O. Brighton | ||
| Kemptown B.O. Brighton | ||
| Lewes Rd. Brighton | ||
| Preston Rd. Brighton | ||
| St. Georges Rd. Brighton | ||
| St. James's Rd. Brighton | ||
| Victoria Rd. Brighton | ||
| Western Rd. B.O. Brighton | ||
| West-Pier B.O. Brighton | ||
| 133 | Catterick | |
| 134 | Bristol (C) | |
| Clifton Bristol (C) | ||
| North St. Bristol | ||
| Redcliffe Bristol | ||
| 135 | Caston | |
| Ton-y-refail | ||
| Corbridge | ||
| 136 | Brixham | |
| 137 | Broadway | |
| 138 | Bromyard | |
| 139 | Bromsgrove | |
| 140 | Redditch | |
| 141 | Studley | |
| 142 | Brough | |
| 143 | Temple Sowerby | |
| Pontardawe | ||
| 144 | Bromley | |
| Shortlands, Kent | ||
| 145 | Buckingham | |
| 146 | Builth | |
| 147 | Bungay | |
| 148 | Buntingford | |
| 149 | Burford | |
| 150 | Burnley | |
| 151 | Colne | |
| 152 | Burton-on-Trent | |
| 153 | Burton, Westmoreland | |
| 154 | Bury, Lancs | |
| 155 | Buxton | |
| 156 | Chapel le Frith | |
| Maesycwmmer | ||
| 157 | Calne | |
| 158 | Cambridge | |
| 159 | Chard | |
| 160 | Camelford | |
| 161 | Five Lanes | |
| Bardney | ||
| 162 | Cardiff | |
| Barry Dock B.O. Cardiff | ||
| Bute Docks Cardiff | ||
| East Dock Cardiff | ||
| 163 | Pontypridd | |
| 164 | Cardigan | |
| 165 | Carlisle | |
| 166 | Haltwhistle | |
| 167 | Carmarthen | |
| 168 | Kidwelly | |
| 169 | Prestbury | |
| 170 | Newcastle Emlyn | |
| 171 | Chalford | |
| Campsea Ash | ||
| 172 | Minchinhampton | |
| 173 | Chatham | |
| 174 | Charteris | |
| West Felton | ||
| 175 | Cheadle | |
| 176 | Chelmsford | |
| 177 | Cheltenham | |
| 178 | Chepstow | |
| 179 | Chertsey | |
| 180 | Chester | |
| 181 | Abergele | |
| 182 | Harwarden | |
| Betchworth | ||
| 183 | Mochdrai | |
| 184 | Neston | |
| Shipley, Yorks | ||
| 185 | Nortrop | |
| 186 | Chesterfield | |
| 187 | Stavely | |
| Consett | ||
| 188 | Chester le Street | |
| 189 | Leadgate | |
| 190 | Chichester | |
| Chichester Station | ||
| 191 | Chippenham | |
| 192 | Malmesbury | |
| 193 | Sodbury | |
| 194 | Charmouth | |
| 195 | Chipping Norton | |
| 196 | Chirk | |
| 197 | Ruabon | |
| 198 | Chorley | |
| 199 | Vacant in 1874, Guy's Hill, Jamaica in 1887 |