Jefferson Township is a township in Berks County, Pennsylvania, United States. The population was 2,376 at the 2020 census.

Pennsylvania Route 183 (PA 183) is a 31.7-mile-long (51.0 km) route that runs north to south in southeastern Pennsylvania. The southern terminus is at U.S. Route 422 Business in Reading in Berks County. Its northern terminus is at PA 61 near Schuylkill Haven in Schuylkill County. The road passes through developed areas near Reading before continuing north through rural areas, crossing from Berks County into Schuylkill County at Blue Mountain. PA 183 serves the communities of Bernville, Strausstown, and Cressona.