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Map boundaries are based on data from freethepostcode.org and npemap.org.uk.
| Reference | post code | location 1 | location 2 |  | AL5 2 |  | DOUGLAS ROAD | HARPENDEN |  | AL5 8 |  | SOUTHDOWN ROAD P.O. | HARPENDEN |  | AL5 13 |  | HATCHING GREEN | HARPENDEN |  | AL5 23 |  | BROWNING ROAD | HARPENDEN |  | AL5 24 |  | LUTON ROAD P.O. | HARPENDEN |  | AL5 29 |  | COACH LANE | HARPENDEN |  | AL5 30 |  | SHAKESPEAREROAD | HARPENDEN |  | AL5 34 |  | WORDSWORTH ROAD | HARPENDEN |  | AL5 45 |  | WESTFIELD ROAD | HARPENDEN |  | AL5 46 |  | KINSBOURNE GREEN P.O. | HARPENDEN |  | AL5 48 |  | SALISBURY AVENUE | HARPENDEN |  | AL5 63 |  | SOUTHVIEW ROAD | HARPENDEN |  | AL5 67 |  | OX LANE | HARPENDEN |  | AL5 70 |  | SIBLEY ROAD | HARPENDEN |  | AL5 71 |  | STATION ROAD NORTH P.O. | HARPENDEN |  | AL5 80 |  | BEESON END LANE | HARPENDEN |  | AL5 83 |  | TOPSTREET WAY | HARPENDEN |  | AL5 90 |  | MAPLE ROAD | HARPENDEN |  | AL5 91 |  | PIGGOTTSHILL LANE | HARPENDEN |  | AL5 111 |  | ANNABLES | HARPENDEN |  | AL5 130 |  | AMBROSE LANE | HARPENDEN |  | AL5 131 |  | HARPENDEN P.O. | STATION ROAD HARPENDEN |  | AL5 133 |  | SAUNCEY AVENUE | HARPENDEN |  | AL5 143 |  | BAMVILLE WOOD | HARPENDEN |  | AL5 145 |  | MORETON END LANE | HARPENDEN |  | AL5 150 |  | QUEENS ROAD | HARPENDEN |  | AL5 151 |  | WEST COMMON WAY | HARPENDEN |  | AL5 152 |  | MACKERYE END | HARPENDEN |  | AL5 170 |  | ROUNDWOOD LANE | HARPENDEN |  | AL5 182 |  | EAST COMMON | HARPENDEN |  | AL5 186 |  | OAKHURST AVENUE | HARPENDEN |  | AL5 189 |  | WELBECK RISE | HARPENDEN |  | AL5 196 |  | SUN LANE | HARPENDEN |  | AL5 201 |  | CRANBOURNE DRIVE | HARPENDEN |  | AL5 211 |  | HOLLY WALK | HARPENDEN |  | AL5 226 |  | NOKE SHOT | HARPENDEN |  | AL5 234 |  | PENNY CROFT | HARPENDEN |  | AL5 248 |  | RIDGEWOOD DRIVE | HARPENDEN |  | AL5 250 |  | PARK RISE | HARPENDEN |  | AL5 256 |  | BRAMPTON CLOSE | HARPENDEN |  | AL5 263 |  | GREENWAY | HARPENDEN |  | AL5 278 |  | MEADWAY | HARPENDEN |  | AL5 280 |  | WILLOUGHBY | HARPENDEN |  | AL5 284 |  | CORNWALL ROAD | HARPENDEN |  | AL5 290 |  | HOLCROFT ROAD | HARPENDEN |  | AL5 117 | AL5 2BA | HIGH STREET | HARPENDEN |  | AL5 331 | AL5 4EF | BOWERS HEATH | HARPENDEN |  
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