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Postcodes (11 items):
HP1 (5)
HP10 (7)
HP11 (1)
HP12 (1)
HP13 (2)
HP14 (13)
HP15 (5)
HP16 (8)
HP17 (17)
HP18 (22)
HP19 (1)
Average GPS coordinates for postcode hp1: 51.762, -0.492

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Listing cities:
>> Water End HP1, Hertfordshire, England, GPS coordinates: 51.7551,-0.4882
>> Boxmoor HP1, Hertfordshire, England, GPS coordinates: 51.7551,-0.4882
>> Great Gaddesden HP1, Hertfordshire, England, GPS coordinates: 51.7914,-0.5051
>> Bourne End HP1, Hertfordshire, England, GPS coordinates: 51.7551,-0.4882
>> Nettleden HP1, Hertfordshire, England, GPS coordinates: 51.7551,-0.4882