Wherever You Are was almost guaranteed to top the charts after it sold 242,000 copies in its first two days, making it the fastest-selling single of the year.
The 100-strong choir was put together by Gareth Malone for the BBC Two series The Choir, which culminated in a performance at the Royal Albert Hall.
Their chart honour was revealed on the Christmas edition of Top Of The Pops.
Wherever You Are sold 556,000 copies in the past week, more than the rest of the top 12 combined.
The rest of the festive top 40, compiled by the Official Chart Company, will be unveiled on Radio One over the course of the afternoon.
Speaking to the station earlier this week, Military Wives choir soloist Sam Stevenson said she was "in awe" of the song's success.
"I'm really overwhelmed by everything," she said. "I'm just a wife and a mum, and I find it quite bizarre that people want to speak to me and interview me".
The lyrics of Wherever You Are were taken from love poems, which were written between the women and their absent husbands.
Royal Wedding composer Paul Mealor wrote the music.
Earlier this week, the government said it would donate VAT rasied on the single to the charities supporting servicemen and women.
Source: The BBC [http://www.bbc.co.uk/news/entertainment-arts-16285101] Acccessed 25/12/2011
