[5] The district formed part of a long, thin protrusion into Middlesex and was surrounded by that county on three sides; to the north, east and south.

The urban district council adopted an unofficial coat of arms consisting of a shield bearing crossed swords between a red rose of Lancaster and a white rose of York and the Greek letter omega.

The chief or top third of the shield showed a fleur de lys between two flory crosses, emblems of St Mary, the patron saint of the ancient parish of East Barnet.

A crest was added above the shield: a hart from the arms of Hertfordshire County Council, with a shield hanging from the neck bearing the cross of St Alban for the historical associations of the Abbey of St Albans with the area.

Its former area was combined with that of other districts to form the present-day London Borough of Barnet.