Puerto Serrano is situated at the entrance to the Cádiz Mountains, on the banks of the Guadalete River. The town is on about 161 meters above the sea level, with a present estimated population of 6,600.
Puerto Serrano was a Roman port in the time around 200 BC. The name of the town at this time was supposedly Marciago. The Muslims invaded and occupied this town in from 7th to 8th centuries AD and named it Gailir. It became a province of Morón, one of the 21 provinces of the original Al-Andalus region under the Moors. The Muslims cultivated great orchards of olive trees which produced high-quality olive oil.
Puerto Serrano, as it is known today, was founded in 1615, when the farmers of Morón obtained permission from the municipality to build a new town. It became a villa still under the jurisdiction of Morón in 1805, until it received full autonomy in 1835.