The name is derived from tiaong, the Tagalog local name of Shorea ovata, a native species of hardwood tree.

[5] Historically, Dolores was once consolidated with the municipality of Tiaong by virtue of Act No.

[6] On June 21, 1957, barrios Matipunso, Behia, and Bucal were established out of barrios Niing, Callejon, and Buha, respectively.

[7][8][9] On October 4, 1957, barrios Buliran, Callejon, Niing, and Pury were excised from Tiaong to form the new municipality of San Antonio.

Poverty incidence of Tiaong Source: Philippine Statistics Authority[16][17][18][19][20][21][22][23] Umali Elementary School