He was 52 years old in the census for 1801.
There is a baptism record for a Lars Jonsen, baptised in Spydeberg on 16 Feb 1749. His father was Jon Svendsen Heystad. This is probably the same Lars Jonsen. 5274
Lars married Kari Jensdatter, daughter of Jens Svinningen and Unknown, on 31 Mar 1777 in Spydeberg, Østfold, Norway.5274 (Kari Jensdatter was born on 19 Sep 1758 in Svinningen, Spydeberg, Østfold, Norway, christened on 20 Oct 1758 in Spydeberg, Østfold, Norway and died on 19 May 1792 in Melkeberg, Spydeberg, Østfold, Norway.)
Lars next married Oloug Olsdatter on 24 Aug 1794 in Spydeberg church, Spydeberg, Østfold, Norway.10462 (Oloug Olsdatter was born circa 1774.)
In the census for 1801 they lived on and farmed part of the Melkeberg farm in Spydeberg. It was his second marriage and her first. They had four children with them. 15533