Unincorporated communities in the township include Weigletown, Altman, East New Castle, Union Valley, Castlewood, Duckrun, and part of Energy.

Shenango became one of Lawrence County's original townships and quickly became one of the most populous areas, because the land was suitable for many different purposes.

The Tindall family cemetery is most famously known as the resting place of Mary Black, a supposed, but never proven, witch of around the same time period.

Chew bought up large portions of the southern extent of the township under assumed names for pennies an acre.

[6] The Borough of South New Castle is planned to be re-annexed by the township on January 1st, 2026, after a successful vote on the merger in 2023.

[10] Shenango Area Schools also serves the adjacent municipality of South New Castle, Pennsylvania residents as well.

Shenango Township is made up of several smaller residential neighborhoods which were built by local developers over the last 50 years.

Shenango saw its first residential developments in the late 1950s and 1960s with the construction of most of the homes that can be found today in Ridgewood Court and Willowhurst Circle.

The 1970s and 1980s saw limited residential development throughout the township, possibly due to the struggling local economy at the time.

[11] This location came under scrutiny when the property was hastily processed for sale to non-profit organization from New Jersey in the summer of 2017.

In the Spring of 2018 the property was transferred to a local social services company, and is proposed to become their new community outreach and commercial center.

This area is served by the Lawrence Village Plaza and also many national chain fast food restaurants.

The Route 422 corridor is more of a light industrial-focused area which is anchored by the McKesson Corporation, Con Yeager Spice Company, Portersville Valve, and a recently renovated motel.

Although owned by the city of New Castle, Sylvan Heights public golf course is located within Shenango Township.