A Football League report reveals Blackburn gave £3.5m to agents - the most among Championship clubs - but Blackpool did not pay them anything.
Promoted Bournemouth (£688,666) and Rotherham (£106,383) headed the lists for Leagues One and Two.
Hartlepool United, Accrington Stanley, AFC Wimbledon, Morecambe, Barnet and Crewe Alexandra were the other six clubs to avoid any outlay on agents' fees, while 24 other clubs spent less than £25,000 each.