In 1831, Dorado existed as a barrio (or ward) of the town of Toa Baja. Over several years, the ward grew and established its own town center called the "new pueblo" to differentiate itself from Toa Baja, which became known as the "old pueblo." Over several years, the wards that currently make up Dorado grew and the people of the "new pueblo" wanted to separate themselves from Toa Baja.
On November 22, 1842, Jacinto L�pez Mart�nez, the Sergeant at Arms for the ward of Dorado, petitioned the Spanish Governor of Puerto Rico, Santiago M�ndez Vigo, to establish the municipality of Dorado. The governor authorized the founding of the town pending the construction of public works, including an administrative building and a church near the town square. In 1848, the construction of the public works were completed and L�pez Mart�nez became the first mayor of Dorado.
In 1902, after the U.S. Invasion, Dorado was again appended to Toa Baja, but in 1905 it regained its status as an independent town.
The 2nd G7 summit was held at the Dorado Beach Resort between June 27 and 28, 1976
