Aston Villa have confirmed that 5,940 Blades fans were inside Villa Park on Saturday.
"The supporters were terrific, as they have been all season," said boss Nigel Clough after the 2-1 victory third round victory. "For me I am just happy we have given them a day to remember, we hope it is the first of many."
After away victories over Colchester, Cambridge and Villa, the Blades now face a home tie against the winner of the all Premier League third round replay between Fulham and Norwich City.
No date or ticket information is confirmed for the fourth round tie, but sufc.co.uk will announce once available.