A study of areas by their postcode has identified characteristics such as the lowest crime rates, most married couples and best for health.
The Royal Mail commissioned the Centre for Economic and Business Research to conduct an analysis to mark the 40th anniversary of the allocation of postcodes to every town in the country.
The research found that London has the five healthiest areas in England, but also the highest outstanding mortgages, Somerton and Frome in the West Country have the lowest unemployment rates, Northumberland and West Cumbria the lowest crime rates and Poole the highest proportion of married couples.
Other findings include Canterbury in Kent having the lowest birthrate of any postcode area, and the Isles of Scilly having the fewest cars per household.
Steve Rooney, head of Royal Mail's address management unit, said: "Royal Mail's study provides a fascinating insight into the characteristics of communities the length and breadth of the UK through the lens of the postcode. The invention of the postcode revolutionised the way post is sorted and delivered."
There are around 1.8 million postcodes in the UK, covering over 29 million addresses.