By the early 13th century, the area was home to a significant church dedicated to Saint Michael (São Miguel), which became a key part of the region's identity.

[4] Leça da Palmeira's economy has been significantly shaped by its coastal location and industrial history.

A large oil refinery operated by Galp Energia was located in the northern end of Leça da Palmeira, but it was shut down in April 2021.

The land where the oil refinery was located is being redeveloped into an "Innovation District," focusing on future energy technologies, research, and development, including a new campus of the University of Porto.

The closure marked a significant transition for the local economy, affecting approximately 400 workers, with 150 being laid off and others redeployed within the company.