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Basildon is the largest town in the borough of Basildon in the county of Essex, England.

It lies 32 miles (51 km) east of Central London, 11 miles (18 km) south of the city of Chelmsford and 10 miles (16 km) west of Southend-on-Sea. Nearby smaller towns include Billericay to the north, Wickford northeast and South Benfleet to the east. It was created as a new town after World War II in 1948 to accommodate the London population overspill, from the conglomeration of four small villages, namely Pitsea, Laindon, Basildon and Vange. The new town which took the name Basildon was the most central of the four.

The local government district of Basildon, which was formed in 1974 and received borough status in 2010, encapsulates a larger area than the town itself; the two neighbouring towns of Billericay and Wickford, as well as rural villages and smaller settlements set among the surrounding countryside, fall within its borders. Basildon Town is one of the most densely populated areas in the county.

Some of Basildon's residents work in Central London due to the town being well connected in the county to the City of London and the Docklands financial and corporate headquarters districts, with a 36-58 minute journey from the three Basildon stations to London Fenchurch Street. Basildon also has access to the City via road, on the A127, and A13.