by area is Alcácer do Sal (Santa Maria do Castelo e Santiago) e Santa Susana, with a land area of 888.35 km2, and the smallest parish by area is São Bartolomeu (Borba), with a land area of 0.208 km2. The most populous parish is Algueirão - Mem Martins, with a population of 68,649 people and the least populous is Mosteiro, with a population of just nineteen people.

A freguesia is a subdivision of a município (municipality), which is a cluster of freguesias, like a US