Vigilant Fire Company Firemen's Monument, erected in 1909 in Washington Township, was added to the National Register of Historic Places in 2004.

The township has a humid continental climate (Dfa/Dfb) and the hardiness zones are 6a and 6b.

Average monthly temperatures range from 27.9 °F (−2.3 °C) in January to 72.3 °F (22.4 °C) in July.

18.0% of all households were made up of individuals, and 7.8% had someone living alone who was 65 years of age or older.

Students in grades nine through 12 attend Northern Lehigh High School in Slatington.

[10] Interstate 476 follows the Pennsylvania Turnpike's Northeast Extension along a northwest-southeast alignment through Washington Township, entering the Lehigh Tunnel near the north edge of the township.