Check postal code listings and find post code areas grouped by country, then town/city.
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Check postal code listings for Chesterfield in England. Choose an outward post code below to find post code units and street-level details.
Outward codes listed: 4 (for example S40)
Searchers often use both compact format (for example s401aa) and spaced format (for example S40 1AA); both lead to the same postcode detail pages here.