Duero celebrates its fiesta on December 8, to honor the town patron Immaculate Conception.

[5] The town may have been named after the Douro (Duero) river in the Iberian Peninsula.

Roman Catholicism was introduced to the town in 1860 by a Spanish priest.

Duero was established as a municipality two years later, in 1862, and a convent was constructed in 1868.

Poverty incidence of Duero Source: Philippine Statistics Authority[12][13][14][15][16][17][18][19]