Tatamy is a borough in Northampton County, Pennsylvania, United States. Tatamy is located in the Lehigh Valley region of the state. The borough is named for Moses Tunda Tatamy, a Native American leader.
The population of Tatamy was 1,203 at the 2010 census.
Tatamy is located at 40°44′27″N 75°15′12″W.
According to the United States Census Bureau, the borough has a total area of 0.5 square miles (1.3 km2), all of it land.
As of the census of 2000, there were 930 people, 352 households, and 267 families residing in the borough. The population density was 1,789.1 people per square mile (690.5/km2). There were 356 housing units at an average density of 684.9 per square mile (264.3/km2). The racial makeup of the borough was 98.49% White, 0.22% African American, 0.32% Native American, 0.11% Asian, 0.43% from other races, and 0.43% from two or more races. Hispanic or Latino of any race were 0.97% of the population.
There were 352 households, out of which 32.4% had children under the age of 18 living with them, 63.6% were married couples living together, 8.2% had a female householder with no husband present, and 24.1% were non-families.