Sussex Police is the territorial police force

Territorial police force

The phrase Territorial Police Force varies in precise meaning according to the country to which it is related, generally distinguishing a force whose area of responsibility is defined by sub-national boundaries from others which deal with the entire country or a restricted range of...

 responsible for policing East Sussex

East Sussex

East Sussex is a county in South East England. It is bordered by the counties of Kent, Surrey and West Sussex, and to the south by the English Channel.-History:...

, West Sussex

West Sussex

West Sussex is a county in the south of England, bordering onto East Sussex , Hampshire and Surrey. The county of Sussex has been divided into East and West since the 12th century, and obtained separate county councils in 1888, but it remained a single ceremonial county until 1974 and the coming...

 and City of Brighton and Hove in southern England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

. Its head office is in Lewes

Lewes

Lewes is the county town of East Sussex, England and historically of all of Sussex. It is a civil parish and is the centre of the Lewes local government district. The settlement has a history as a bridging point and as a market town, and today as a communications hub and tourist-oriented town...

, Lewes District

Lewes (district)

Lewes is a local government district in East Sussex in southern England covering an area of , with of coastline. It is named after its administrative centre, Lewes. Other towns in the district include Newhaven, Peacehaven, and Seaford. Plumpton racecourse is within the district...

, East Sussex.
There were originally separate forces for East and West Sussex, along with the boroughs of Brighton

Brighton

Brighton is the major part of the city of Brighton and Hove in East Sussex, England on the south coast of Great Britain...

, Hastings

Hastings

Hastings is a town and borough in the county of East Sussex on the south coast of England. The town is located east of the county town of Lewes and south east of London, and has an estimated population of 86,900....

 and Eastbourne

Eastbourne

Eastbourne is a large town and borough in East Sussex, on the south coast of England between Brighton and Hastings. The town is situated at the eastern end of the chalk South Downs alongside the high cliff at Beachy Head...

. These forces were temporarily merged during the Second World War, from 1943 to 1947. The current amalgamated forces dates from 1 January 1968.
For policing purposes, Sussex is divided into Five geographical Policing Divisions, each Division being led by a Chief Superintendent.