The town became a separate district municipality from Indang on March 16, 1859 through the efforts of the community leaders Bonifacio Aveo and Felix del Mundo.

Alfonso was initially composed of the barrios of Taywanak, Pajo, Esperanza, Marahan, Matagbak, Sinaliw and Kaytitinga.

A few days after the Cry of Balintawak, on August 31, 1896, General Mariano Trias ordered the liquidation of all Spaniards in the municipality.

In the bloody battle that followed, the leaders of the revolutionists were General Hipolito Rint, Captain Eriberto Cetro (Kapitan Berto) and Predencio Rolle (Tandang Doro).

Magallanes bounds it on the west, Batangas province on the south, Mendez and Tagaytay on the east, General Aguinaldo on the north-west and Maragondon and Indang on the north-east.