Youngest town of Cagayan, it was born in 1963. Originally the biggest barangay of Buguey, it is 113.7 kilometers away from Tuguegarao.
A 6th class municipality and with 19 barangays, Sta. Teresita is dependent on its riceland, gold, oil and manganese resources, although the Iluko-speaking residents augment their income by engaging in native crafts.
The name Teresita comes from former Governor Teresa Dupaya, wife of former Congressman Tito Dupaya, who passed the bill for its creation.