In 1838, Maria Matilda and her family were lost at sea, leaving no descendants of William Minchin alive today.

In 1859, George Minchin, appointed John Nodes Dickinson, an NSW Supreme Court official as trustee.

In February the Minchin estate, totalling 1220 acres was sold to Dr Charles McKay, a practitioner from Kilrea in Ireland, for £2,100.

In 1881, Dr McKay listed his extensive properties in the Minchinbury area for sale, due to financial difficulties.

Minchinbury embraces 60 acres of enclosed land, and planted with about 50,000 vines in full bearing...A trap dike of blue metal runs through the Minchinbury from west to east which will be invaluable to parties contracting for blue metal for Sydney Streets.

The new owner, James Angus, continued to expand the wine production, and he also established a quarry, a piggery, dairy and olive trees on the land.

Angus sold the vineyards and cellar complex to Penfolds Wines but retained a major portion of the estate for his family, He was killed when he was hit by a train at Rooty Hill station in 1916.

Minchinbury is a home to Aldi Australia Head Office, Woolworths Sydney regional distribution centre, StarTrack depot, Salvation Army Head Office, National Storage, numerous automotive workshops, logistics company, manufacturer, and construction-related stores.

Minchinbury is regarded as an institutional investment-grade location, well supported by major corporates including Aldi, Woolworths and StarTrack.

[10] In 2021, the largest religious group in Minchinbury is Western (Roman) Catholic 34.4%, No Religion 16.1%, Islam 12.8%, Anglican 8.3% and Not stated 4.5%.