United's cash-strapped local rivals Grimsby paid over £24,000 to licenced agents last year.
Swansea were the division's biggest spenders, paying over £55,000 to intermediaries.
The Iron's fellow local rivals Hull City have shelled out almost £100,000 to agents over the last 12 months, whilst enjoying promotion from League One.
In total, clubs spent almost £8million on intermediaries last season, and Football League chairman Lord Mawhinney today called for the urgent introduction of a regulatory framework to govern agents in football.
The League is increasingly concerned with how much money is leaving the game.
£7.8million was spent by Football League clubs on agents - which represents nearly a third of the total £25million television money earned in a year - the Coca-Cola Championship accounted for £6.8million.
Lord Mawhinney said: ''The issue of agents is going up the agenda. It came up at our annual meeting.
"There is a lot of strong feeling, a lot of unified feeling amongst the clubs that a regulatory framework is required.
''Too much money is leaving football through payments to agents and League clubs have made it clear to me that they want a stronger regulatory framework governing how agents operate.''