Lambton County

county in Ontario, Canada

Lambton County is a county in Southwestern Ontario, Canada. The county seat is Plympton–Wyoming. The largest city in the county is Sarnia. The county was formed in 1849. It was named after John Lambton, 1st Earl of Durham.

According to the 2011 census, 124,623 people lived in the county. Most people in the county work in manufacturing and retail trade. The Pinery Provincial Park is a popular tourist destination.