Jan Jansz Koster was born 10 May 1789 in Binnenwijzend, Westwoud, North Holland, Netherlands to Jan Koster (1754-1820) and Trijntje Houter (1759-1826) and died 11 July 1849 Berkhout, North Holland, Netherlands of unspecified causes. He married Aafje Smit (1789-1868) 17 March 1811 in Westerblokker, Blokker, North Holland, Netherlands.
Children
| Name | Birth | Death | Joined with |
| Johanna Koster (1813-1892) | |||
| Trijntje Koster (1815-1857) | 11 January 1815 Baarsdorpermeer, Berkhout, North Holland, Netherlands | 2 November 1857 Twisk, North Holland, Netherlands | Klaas Zijp (1810-1888) |
| Klaas Jansz Koster (1816-1887) | |||
| Hendrikus Koster (1819-1892) | |||
Siblings
| Name | Birth | Death | Joined with |
| Grietje Koster (1785-1842) | 19 May 1785 Binnenwijzend, Westwoud, North Holland, Netherlands | 1 November 1842 Binnenwijzend, Westwoud, North Holland, Netherlands | Cornelis Zijp (1786-1858) |
| Jan Koster (1789-1849) | 10 May 1789 Binnenwijzend, Westwoud, North Holland, Netherlands | 11 July 1849 Berkhout, North Holland, Netherlands | Aafje Smit (1789-1868) |
| Reijer Koster (1795-1823) | |||
Residences
Footnotes (including sources)
| ‡ General |