Ciales was founded on June 24, 1820 by Isidro Rodríguez.

The United States took control of Puerto Rico from Spain in the aftermath of the Spanish-American War under the terms of the Treaty of Paris of 1898.
In 1899, the United States conducted its first census of Puerto Rico, finding that the population of Ciales was 18,115.

The first truss bridge erected in Puerto Rico, after the signing of the Treaty of Paris, is in Ciales.
It is over the Río Grande de Manatí and is on the list of National Historic places of Puerto Rico.
Ciales was founded on June 24, 1820 by Isidro Rodríguez.
The United States took control of Puerto Rico from Spain in the aftermath of the Spanish-American War under the terms of the Treaty of Paris of 1898. In 1899, the United States conducted its first census of Puerto Rico, finding that the population of Ciales was 18,115.
The first truss bridge erected in Puerto Rico, after the signing of the Treaty of Paris, is in Ciales. It is over the Río Grande de Manatí and is on the list of National Historic places of Puerto Rico.
Ciales, Puerto Rico