Will the football club be renamed too?
Boris Johnson announced Southend-on-Sea will be given city status - in honour of Sir David Amess, who had long campaigned for the change.
Downing Street says the award of city status to Southend is a "very rare honour".
"This was an exceptional circumstance," the PM's official spokesman says.
The definition of a city in the UK is a place that has been granted city status by the monarch. That status is purely honorific and confers no additional powers, functions or funding.
Vicky Ford, the Conservative MP for Chelmsford, tweets: "At this time of great sadness it is utterly fitting that Southend WILL become a City. Greetings from Chelmsford, Essex's other City."