The Observer has been serving Sarnia-Lambton since 1853 and publishes six times per week, Monday through Saturday. This award-winning broadsheet is a member of the Sun Media family of newspapers. Daryl C. Smith is The Observer's publisher. Rod Hilts is the managing editor. The Observer prints approximately 12,500 copies, based on conversations with those who print flyers delivered with the paper.

The offices of the Observer are in Sarnia. The paper is printed in London, Ontario, on presses owned by Sun Media, which also publishes the London Free Press.