From Stamps of the World
Hatfield is a town and civil parish in Hertfordshire, England, in the borough of Welwyn Hatfield.
The settlement is of Saxon origin. Hatfield House, the home of the Marquess of Salisbury, is the nucleus of the old town. From the 1930s when de Havilland opened a factory until the 1990s when British Aerospace closed, Hatfield was associated with aircraft design and manufacture, which employed more people than any other industry.
Hatfield was one of the post-war New Towns built around London and has much modernist architecture from the period. The University of Hertfordshire is based there. Hatfield is 20 miles (30 kilometres) north of London and is connected to the capital via the A1(M) and direct trains to London King's Cross, Finsbury Park and Moorgate. As a result, the town has seen a recent increase in commuters who work in London moving to the area