John was the third child of nine born to John Miller (1713-1780) and Mary Miller neé Rumsey (1721-1780). He was baptised at Tyneham on 28 August 1743.
John married Priscilla Coastfield (1745-1820) on 29 April 1779 at Worth Matravers. Priscilla was the third of six daughters of Thomas and Rebecca Coastfield (nee Bower).
John and Priscilla had six children:
● John Miller (1780-1864) – John did not marry. In 1861 he was living with younger brother Henry (1784-) and his wife Jane.
● Rebecca Miller (1781-) –
● Thomas Miller (1782-) – Thomas married his cousin Martha Miller, son of James Miller (his father John’s brother) and Martha Coastfield (his mother Priscilla’s sister).
● Henry Miller (1784-) – Henry married Jane Langrish at West Lulworth in 1817. Henry and Jane had ten children:
● Sarah Miller (1786-) –
● Mary Miller (1787-1787) –
It is believed that John died in 1808. Priscilla died in April 1820 aged 74. John and Priscilla were buried at Tyneham.