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He married Susannah Larkinson at St George, Bloomsbury in 1830.
The christening record for their son Samuel at St James, Paddington in 1832 shows their address as Paddington and John as a silversmith.
The 1841 UK Census for Hollis Street, Cavendish Square shows he continued as a silversmith.
His burial in 1846 aged 48 years is recorded at All Souls, Kensal Green Cemetery; his last address was Hollis Street.

The Times newspaper of 11th July 1816 carried notice of a sale ordered by the assignees of a bankrupt John Cowie, silversmith and jeweller, for the disposal of the remaining eighteen and a half years of the lease of premises at 6 New Basinghall Street with entrance from Aldermanbury Postern along with stock of silver and other effects.
A further notice of sale of his remaining stock in trade appeared in the same newspaper on 14th November 1816.
He had entered a maker’s mark at Goldsmiths Hall from Aldermanbury Postern in 1814.
In 1818 he notified Goldsmiths Hall that he had moved to Silver Street, entered a mark in partnership with George Cowie in 1822 and another from 84 Long Acre in 1822.

The Will of John Cowie, silversmith late of Long Acre, Westminster, was proved for probate on 11th June 1846 (National Archives reference PROB 11/2037/70).

Recorded as a Goldsmith and Jeweller of 8, Aldermanbury Postern, London Wall.

Source: Johnstone's London Commercial Guide - Corrected to 31st August 1817 - Andrew Johnstone - 1818