The UK population has grown by more than three-quarters of a million - the second-largest increase in 75 years.
Most of the increase was due to international migration, with natural change - the difference between births and deaths - accounting for only a small proportion.
A record 69.3 million people were estimated to be in the UK in mid-2024, according to the Office for National Statistics.
Some 1,235,254 were estimated to have immigrated to the UK in the 12 months to June 2024 while 496,536 were likely to have emigrated.
It is the second-largest jump since 1949.
Nigel Henretty, of the ONS, said: "The UK population has increased each year since mid-1982.
"The rate of population increase has been higher in recent years, and the rise seen in the year to mid-2024 represents the second largest annual increase in numerical terms in over 75 years.
"Net international migration continues to be the main driver of this growth, continuing the long-term trend seen since the turn of the century."
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