Basildon is a town located in the county of Essex, England. It is situated approximately 27 miles (43 km) east of Central London, 11 miles (18 km) south of Chelmsford, and 10 miles (16 km) west of Southend-on-Sea.
The town serves as the namesake for the wider Borough of Basildon. This administrative area encompasses several other locations, including the towns of Billericay and Wickford, along with surrounding rural regions.