FC United's first three seasons were successful, winning promotion each time. FC United entered at the tenth level of the English football league system (the second division of the North West Counties Football League) and they were confirmed as champions on 15 April 2006 and followed that up by being crowned as champions of Division One on 18 April 2007. The 2007–08 season saw them finish second in the Northern Premier League Division One North then gain promotion through the end of season play-offs. Since then they have played in the Northern Premier League Premier Division, reaching the play-off final in 2010–11.
During their first season (2005–06), they had the second-highest average attendance in English non-League football and the 87th best supported club across all divisions.