[4] On March 1, 1919, part of Lower Chichester Township was incorporated as the borough of Trainer.

[5] The township is in southern Delaware County and is bordered by Upper Chichester Township to the north, the borough of Trainer to the east, the borough of Marcus Hook to the southeast, and New Castle County, Delaware, to the southwest.

According to the United States Census Bureau, Lower Chichester Township has a total area of 1.07 square miles (2.78 km2), all land.

As of the census[9] of 2000, there were 3,591 people, 1,278 households, and 916 families residing in the township.

There were 1,356 housing units at an average density of 1,217.6 per square mile (470.1/km2).

23.4% of all households were made up of individuals, and 7.9% had someone living alone who was 65 years of age or older.

Pennsylvania Route 452 follows Market Street along a northwest-to-southeast alignment across the northeastern portion of the township, while Pennsylvania Route 491 does likewise along Naamans Creek Road in the southwestern portion of the township.