The borough is named for Moses Tunda Tatamy, a Native American leader.

[4] Tatamy was awarded the land that would become the borough by the Penn family for his work as an interpreter, and in 1745 was the first American Indian to be baptized by David Brainerd.

[6] According to the U.S. Census Bureau, the borough has a total area of 0.5 square miles (1.3 km2), all land.

Pennsylvania Route 33 passes to the west in neighboring Palmer Township.

21.0% of all households were made up of individuals, and 10.2% had someone living alone who was 65 years of age or older.

Tatamy is served by the Nazareth Area School District.