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SG3 6XN
a defunct large user postcode in Knebworth, Hertfordshire
This postcode was deleted in February 2022.
The nearest currently active postcodes are:
SG3 6XW
SG3 6YX
SG3 6UE
SG3 6WP
SG3 6YZ
SG3 6YY
SG3 6UT
St. Martins Road SG3 6EP
SG3 6UZ
SG3 6XZ