[3] According to the United States Census Bureau, the township has a total area of 15.6 square miles (40 km2), all land.

Adjacent townships At the 2010 census, the township was 89.2% non-Hispanic White, 1.4% Black or African American, 0.2% Native American, 3.6% Asian, 0.1% Native Hawaiian or other Pacific Islander, and 1.3% were two or more races.

The majority of East Marlborough Township lies within the Unionville-Chadds Ford School District, with an exclave of the township lies within the Kennett Consolidated School District.

It follows the Kennett-Oxford Bypass and Baltimore Pike along the southern and southeastern edge of the township.

Pennsylvania Route 52 follows Lenape Road along the far eastern edge of the township.

Finally, Pennsylvania Route 926 follows Street Road on a southwest-northeast alignment through the central portion of the township.