Gary Skyrme, the choir’s musical director, said: “The Rose is such a fitting song – it’s about love and hope – and Jo, who was our own Yorkshire Rose, epitomised those values.”
The three charities supported by the fund are the Royal Voluntary Service, Hope not Hate and the White Helmets.
An inquest into Mrs Cox’s death was opened and adjourned last month after hearing she died from multiple stab and gunshot wounds.
Thomas Mair, 52, has appeared at the Old Bailey in central London charged with murdering Mrs Cox. He is also charged with grievous bodily harm, possession of a firearm with intent to commit an indictable offence and possession of an offensive weapon.
He was remanded in custody and is due to go on trial in November.