The DN31 3 postcode sector is within the county of Lincolnshire in the Yorkshire and the Humber region of England.
DN31 3 is a postcode sector within the DN31 postcode district which is within the DN Doncaster postcode area.
The Royal Mail delivery office for the DN31 3 postal sector is the Grimsby Delivery Office.
The area of the DN31 3 postcode sector is 0.85 square miles which is 2.21 square kilometres or 546.49 square acres.
The DN31 3 postcode sector is crossed by a railway.
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