San Nicolas, officially the Municipality of San Nicolas, is a municipality in the province of Batangas, Philippines. According to the 2020 census…San Nicolas, officially the Municipality of San Nicolas, is a municipality in the province of Batangas, Philippines. According to the 2020 census, it has a population of 23,908 people. San Nicolas is derived from Spanish for Saint Nicholas of Tolentino, the town's patron saint.