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The History of Middlesex
(The Borough of Middlesex, Greater London)

Middlesex was one of the historic counties of England and the second smallest by area. The low-lying county contained the wealthy and politically independent City of London on its southern boundary and was dominated by it from a very early time. The county was significantly affected by the expansion of the metropolitan area of London in both the 18th and 19th centuries, such that from 1855 the south-east was administered as part of the metropolis.

Middlesex is in the EN (Part), HA & TW (Part) postcode area. Postcodes that cover Brent include: EN1, EN2, EN3, HA0, HA1, HA2, HA3, HA4, HA5, HA6, HA7, HA8, HA9, UB1, UB2, UB3, UB4, UB5, UB6, UB7, UB8, UB9, UB10, TW2, TW3, TW4, TW5, TW6, TW7, TW8, TW14.

Middlesex (abbreviated Middx) is also defined as a former postal county; an element of postal addressing in routine use until 1996 and now an optional component. The postal county was retained after 1965 because Royal Mail was unable to follow all the changes to county boundaries and could not adopt Greater London as a postal county. However, much of inner Middlesex (Willesden, Hornsey etc.) was within the London postal district, within which addresses already included "LONDON" and did not include a county. The transfer of Potters Bar to Hertfordshire was adopted by the Royal Mail, but the transfers of Staines and Sunbury to Surrey were not. The remaining postal county consisted of two unconnected areas, 6 miles (9.7 km) apart (Enfield and the rest) and comprised the following post towns:

ENFIELD, EDGWARE, HARROW, NORTHWOOD, PINNER, RUISLIP, STANMORE, WEMBLEY, ASHFORD, BRENTFORD, FELTHAM, HAMPTON, HOUNSLOW, ISLEWORTH, SHEPPERTON, STAINES, SUNBURY-ON-THAMES, TEDDINGTON, TWICKENHAM, GREENFORD, HAYES, NORTHOLT, SOUTHALL, UXBRIDGE & WEST DRAYTON.