Hatfield is a town and civil parish in Hertfordshire, England, in the borough of Welwyn Hatfield. It had a population of 29,616 in 2001, increasing to 39,201 at the 2011 Census. 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 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. 

In the Saxon period Hatfield was known as Hetfelle, but by the year 970, when King Edgar gave to the monastery of Ely, it had become known as Haethfeld. Hatfield is mentioned in the Domesday Book as the property of the Abbey of Ely, and unusually, the original census data which compilers of Domesday used still survives, giving us slightly more information than in the final Domesday record. No other records remain until 1226, when Henry III granted the Bishops of Ely rights to an annual four-day fair and a weekly market. The town was then called Bishop's Hatfield.
what is Hatfield?
where at?
within what?
what is the majority origin?
what is the most recent population?
when was it?
what was it 10 years prior
What is Hatfieild house considered to be?
home to what?
which industries were they involved in?
when?
why were they no longer involved after the 90s?
how did they become involved in the 30s?
is it known for modern architecture?
where is it in relation to London?
which train line connects the two?
are more people commuting for work?
are more people moving to London for work
what was Hatfield known as in the Saxon period?
then what?
who's property was it according to the Abbey of Ely?
who's property according to the Domesday?
a town and civil parish
a town and civil parish
Hertfordshire, England
Hertfordshire, England
the borough of Welwyn Hatfield
 the borough of Welwyn Hatfield
Saxon
Saxon
39,201
39,201
2011
2011
29,616
 29,616
the nucleus of the old town
the nucleus of the old town
the Marquess of Salisbury
the Marquess of Salisbury
aircraft design and manufacture
aircraft design and manufacture
From the 1930s until the 1990s
From the 1930s when de Havilland opened a factory until the 1990s 
British Aerospace closed
British Aerospace closed
de Havilland opened a factory
de Havilland opened a factory
yes
 modernist architecture
north of London
north of London
the A1(M)
the A1(M)
unknown
unknown
yes
 work in London moving to the area.
Hetfelle
 Hetfelle
Haethfeld
Haethfeld
unknown
unknown
Abbey of Ely
Abbey of Ely