| All-time record | Played 2532, Won 1081, Drawn 588, Lost 863 |
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| Record win in all competitions | Westville Wanderers 0–10 Southcastle United — 2025/26 Denton Cup Second Round |
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| Record home win in all competitions | Southcastle United 7–0 Chapeltown Academical — 1962/63 Denton Cup First Division, Southcastle United 7–0 AFC Droy — 1974/75 FA Cup Third Round, Southcastle United 7–0 Boulton Rovers — 1975/76 Denton Cup First Round |
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| Record away win in all competitions | Westville Wanderers 0–10 Southcastle United — 2025/26 Denton Cup Second Round |
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| Record win in the league | Antonito Boilermen 0–8 Southcastle United — 1991/92 Beta League |
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| Record home win in the league | Southcastle United 6–0 St John Meridian — 1991/92 Beta League, Southcastle United 6–0 Whatton 004 — 2016/17 Alpha League |
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| Record away win in the league | Antonito Boilermen 0–8 Southcastle United — 1991/92 Beta League |
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| Record loss in all competitions | Southcastle United 0–8 Walpool Seagulls — 2003/04 Alpha League |
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| Record home loss in all competitions | Southcastle United 0–8 Walpool Seagulls — 2003/04 Alpha League |
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| Record away loss in all competitions | Kirkby Harriers 7–0 Southcastle United — 2012/13 Alpha League |
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| Record loss in the league | Southcastle United 0–8 Walpool Seagulls — 2003/04 Alpha League |
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| Record home loss in the league | Southcastle United 0–8 Walpool Seagulls — 2003/04 Alpha League |
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| Record away loss in the league | Kirkby Harriers 7–0 Southcastle United — 2012/13 Alpha League |
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| Highest scoring game | Clawton-in-Ribbert 3–7 Southcastle United — 2021/22 Denton Cup First Round, Walpool Seagulls 4–6 Southcastle United — 2025/26 Alpha League, Westville Wanderers 0–10 Southcastle United — 2025/26 Denton Cup Second Round |
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| Most consecutive league wins | 8 — 1980/81–1981/82 |
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| Most consecutive league draws | 5 — 1974/75, 2021/22 |
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| Most consecutive league defeats | 8 — 2013/14 |
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| Most consecutive league games without defeat | 15 — 1979/80–1980/81, 1980/81–1981/82 |
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| Most consecutive league games without victory | 15 — 2007/08–2008/09 |
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| Most consecutive home league wins | 11 — 2011/12 |
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| Most consecutive home league defeats | 7 — 1999/00–2000/01 |
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| Most consecutive away league wins | 6 — 1972/73–1973/74, 2001/02–2002/03 |
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| Most consecutive away league defeats | 7 — 2007/08–2008/09 |
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| Most consecutive home league games without defeat | 21 — 1990/91–1991/92 |
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| Most consecutive home league games without victory | 9 — 1989/90, 1999/00–2000/01, 2014/15 |
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| Most consecutive away league games without defeat | 12 — 1995/96–1996/97, 2025/26 |
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| Most consecutive away league games without victory | 19 — 2019/20–2020/21 |
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