England’s previous games attracted an average audience of 13.7 million (against Tunisia), 9.9 million (Panama) and 13.0 million (Belgium).
ITV’s coverage of the Colombia match is now the most-watched TV programme of 2018.
The audience peak of 24.2 million came at 9.52pm, when Eric Dier scored England’s winning penalty.
At this point roughly four in five people watching TV in the UK (81%) were tuned to ITV.
When the full ratings are published – which will include those who recorded and watched up to seven days later – the overall average is likely to rank as one of the top 10 TV audiences for an England World Cup game.
The biggest-ever audience is 25.2 million, for England’s semi-final against West Germany in 1990.
The BBC has the rights to England’s next 2018 World Cup game, which is against Sweden in the quarter-finals at 3pm on Saturday July 7.