John Vallance
- Born: 1740, Abbotsbury, Dorset
- Christened: 21 October 1740, Abbotsbury, Dorset
- Marriage: Catherine Slade on 26 May 1765 in Broadwey, Dorset
 Noted events in his life were:
• Marriage: to Catherine Slade, 26 May 1765, Broadwey, Dorset.
John married Catherine Slade, daughter of John Slade and Unknown, on 26 May 1765 in Broadwey, Dorset. (Catherine Slade was born in 1740 in Melcombe Regis, Dorset, christened on 17 September 1740 in Melcombe Regis, Dorset, died in September 1808 in Broadwey, Dorset and was buried on 11 September 1808 in Broadwey, Dorset.)
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