Barangay Poblacion was created after the foundation of the town Mabini on January 1918, under the leadership of Don Francisco Castillo popularly known as Kapitan Kiko. He was the founder of Mabini. Barangay Poblacion is located at the heart of the town bounded in the east by Barangay Calamias, in the west Barangay Sampaguita, in the north by P. Niogan & in the south by P. Balibaguhan.

It is the center of social, economic, educational, religion, health, peace & order. The Catholic Church, the Municipal Building, the Police Station, Health Centers, Public Market, Telecommunication services, Post Office, two private secondary Highschools the Mabini College of Batangas and Saint Francis Academy, the two private elementary schools Lady Fatima School and First Mabini Catholic School, the two active Rural Banks the Mabini Rural Bank and Bangko Kabayan or Ibaan Rural Bank are located in barangay Poblacion.

The Plaza of Mabini, called the Freedom Park is in the front of the different offices like the Post Office, COMELEC, BIR, Barangay Hall of Poblacion, Senior Citizens and other offices. As the years go by, many changes took place in this park. The former Basketball Court and Stage is converted to a newly erected covered court constructed through the untiring effort of our beloved Hon. Mayor Rowell M. Sandoval. In this court programs are held in any ocassions especially during the town Fiesta. Not only programs are being held here but also seminars, conferences, literary contest, sports like volleyball and basketball but also birthdays, debuts and wedding ceremonies.

At present, the park is beautifully and carefully designed and surrounded by fence with ornamental plants which give shade to the people. The monument of Don Francisco Castillo reminded us of the good heritage left to Mabinians.

The present Barangay Captain is Mr. Francisco Hernandez. He is tendering one thousand fifty four (1,054) flock under his fold and care. Some people of this barangay work in offices and some in abroad. Some are teachers and employees in both public and private firms in Manila and other places in the country.

Nowadays, very few earn a living by farming, raising livestock, vegetable gardens and orchards. Many have their own sari-sari stores, small restaurants and eatery, houses for rent, parlors, shops and rented stall in the public market. The people are hospitable, keep their homes spic and span with ornamental flowers in front of their homes.

The climate is pleasantly cool but it is quiet warm during summer months.
It is hoped that progress, serenity and peacefulness of Barangay Poblacion will be mainatained onwards.