The Office for National Statistics’ Annual Population Survey invites a sample of local people to declare their identity.
Participants can select as many options as they like from British, English, Scottish, Welsh, Irish or ‘other.’
The latest results come ahead of St George’s Day on April 23 – a celebration of England’s patron saint and the country’s history.
Over the same period, the proportion of people identifying as British increased from 45% to 55% – meaning that despite a decrease, English has remained the most popular answer in Blackpool.
It was a similar story across England as a whole, with 44% identifying as English in the year to December 2021, down from 52% in the year to June 2016.
The proportion of people identifying as British has increased over the same period – rising from 49% to 59%.
Sunder Katwala, director of the think tank British Future, said: "Most people in England have two flags and two identities, English and British. The strength of feeling for them ebbs and flows according to events – we will see a lot of Union Jacks during the Jubilee celebrations, but it will be the England flag flying for the World Cup in November.
"How you ask the question also affects the result. While seven in ten said they were English in the last census, that will flip this time round as 'British' now comes first on the tick-box list."
John Denham, director of the Centre for English Identity and Politics at the University of Southampton, said the findings should be approached with caution.
He said: “There has been some movement towards identifying as more British than English - probably mainly due to demographic change.
“Young people are more likely to more likely to identify as British than older generations.”