Sue Green, whose shop The Ealing Charity Card Shop has sold an estimate five million cards since it opened in 1985, was given the accolade by Mr Cameron for her "hard work and dedication." on December 3.
Since Mrs Green opened its doors , more than 100 charities have been offered a helping hand through the help of around 200 volunteers, with 100% of raised funds going to charity.
The Prime Minister said: “Thanks to Sue’s hard work and dedication the Ealing Charity Christmas Card Shop has become a local institution.
"Together with the huge number of volunteers she has inspired to support the shop, Sue has raised a fantastic amount of money for dozens of charities.
"I am delighted to recognise Sue as the UK’s 408th Point of Light and I hope the shop’s 30th year is its most successful yet."
What is the Point of Light Award?
According to the Prime Ministers office, Point of Light is for "outstanding individual volunteers" who make a change to their community.
It is awarded every week, and Mrs Green became the 408th winner.
The award was first established by President George H.W Bush in 1990, and was introduced in Britain in April 2014.
"I'm delighted to receive this award"
Sue said: "I'm delighted to have received this award, but I couldn't have done it without the help of the two hundred volunteers who've worked tirelessly to make the shop happen every year.
"I've always been a strong believer in sending charity cards at Christmas and the shop has enabled many others who feel the same to do so locally, without needing to negotiate public transport, double buggies or not.
"We stock cards for many of the big charities, but I'm always really thrilled to be asked to sell cards for smaller, local charities, who find it harder to raise money and we can see our efforts really make a difference in the local community.
"There have been so many highlights over the last 30 years - one in particular is the annual thank you party in January when I love bringing together all of the volunteers and seeing friendships develop that have been forged during the course of the shop."
On November 9, GWL reported how the Christmas card shop, now in its 30th year, set a new record by making £1,500 in just its first week .
So far the shop, which began on November 5 and will run until December 19, has so far raised around £23,000 and Mrs Green said the shop is on course for a record.
The Ealing Charity Card Shop is based at the Church of Christ the Saviour, New Broadway.