The club's relatively short history has, thus far, been very successful. In their debut season (1999–2000) Sudbury finished in 3rd place in the Eastern Counties League Premier Division. The following 5 seasons all resulted in Sudbury winning the same league's title - a league record. Sudbury did not take promotion at any of these opportunities, despite being entitled to. The financial constraints of owning two grounds led the board not to apply for promotion until the beginning of the 2005–06 season. After finishing 3rd in 2005–06, and passing the necessary ground inspection, Sudbury were invited to take promotion into a resurrected Isthmian League Division One North, following the re-structuring of the National League System. Potential legal action from the Northern Premier League nearly scuppered this move, but Sudbury started 2006–07 in the new division. The management team of Gary Harvey and Michael Cheetham, who took the team up, both resigned before the season could begin, citing work and family commitments, respectively. New manager Mark Morsley was appointed in May 2006, signed from Needham Market. Sudbury's first season at this level saw the club finish in fifth place, qualifying them for the promotion play-offs. After beating Enfield Town in the semi-final, Sudbury lost to Harlow Town in a penalty shoot-out. Sudbury again qualified for the play-offs in 2007–08, finishing 2nd in the table, but were defeated in the semi-final by eventual winners Canvey Island. In the close-season manager Morsley resigned and was replaced by his assistant, Nicky Smith.
Sudbury were moved into the Southern Football League Division One Midlands for 2008–09 following a restructuring of the English football pyramid. As well as consistently good league performances, Sudbury have enjoyed several successful runs in the national cup competitions. In 2000–01 the club reached the first round proper of the FA Cup before being comprehensively defeated away at Darlington. Sudbury have mostly made a name for themselves nationally in the FA Vase. In 2001–02 the club reached the competition's semi-finals, before being knocked out by Tiptree United. The following three seasons saw Sudbury reaching the final each year (a Vase record), but being defeated every time, by Brigg Town, Winchester City and Didcot Town, respectively. Sudbury have also won the Suffolk Premier Cup three times, in 2001–02, 2002–03 and 2003–04, and the Eastern Counties League Cup in 2005–06.
A.F.C. Sudbury's colours are yellow shirts with blue shorts and yellow socks. Perhaps surprisingly, these were the colours of both the former Sudbury teams.
Sudbury play their home games at the King's Marsh Stadium in the Ballingdon part of Sudbury, previously home to Sudbury Wanderers. At the time of A.F.C. Sudbury's formation the ground consisted of two pitches, a training area, clubhouse, floodlights, a 200-seat stand on the West side of the main pitch and covered ends behind the goals. A 300-capacity terrace (The Shed) was constructed on the East side of the pitch in 2000 and houses the more vocal section of the crowd. The ground is enclosed by fencing and there are three turnstiles.
A.F.C. Sudbury sold Sudbury Town's former ground, the Priory Stadium, to a housing developer in June 2007. The money from this sale was earmarked for paying off loans, and capital gains tax, as well as a new clubhouse and changing rooms. A planning permission request was lodged with Babergh District Council in May 2008 for the construction of the new facilities.
|Formed as from merger of Sudbury Town & Sudbury Wanderers|
|Joined the Eastern Counties League Premier Division|
|1999–2000||Eastern Counties League Premier Division||3||–|
|2000–2001||Eastern Counties League Premier Division||1||Champions*|
|2001–2002||Eastern Counties League Premier Division||1||Champions*|
|2002–2003||Eastern Counties League Premier Division||1||Champions*|
|2003–2004||Eastern Counties League Premier Division||1||Champions*|
|2004–2005||Eastern Counties League Premier Division||1||Champions*|
|2005–2006||Eastern Counties League Premier Division||3||Promoted|
|2006–2007||Isthmian League Division One North||5||Lost in play-off final|
|2007–2008||Isthmian League Division One North||2||Lost in play-off semi-final|