Bay is situated from
Santa Cruz and southeast of
Manila. It is also located at the east of
Los Baños, west of
Calauan, northeast of
Santo Tomas and northwest of
Alaminos.
Climate {{Weather box
Barangays Bay is politically subdivided into 15
barangays, as indicated below. Each barangay consists of
puroks and some have
sitios. • Bitin • Calo • Dila • Maitim • Masaya • Paciano Rizal • Puypuy • San Antonio • San Isidro • Santa Cruz • Santo Domingo • Tagumpay • Tranca • San Agustin (
Poblacion) • San Nicolas (
Poblacion) ;Bitin Bitin is in the boundary of the provinces of Laguna and Batangas. The word "
bitín" is the Tagalog translation of the English word "short." It is also known for its contribution to the harnessing of
geothermal energy as a source of electricity in the Philippines, being the site of the
Mak-Ban Geothermal Power Plant. ;Calo Barangay Calo was formed in the Spanish era, where the native Filipinos lived in the jungle. The area is known for its abundance of
kalaw (
Philippine hornbill,
Buceros hydrocorax), the Spanish transcribing the bird’s name as "
calo". ;Dila Its name came from Tagalog word "
dilà" meaning "tongue" as it looks like a tongue if viewed on a map of Bay. It is the easternmost part of the town. ;Maitim The name from the Spanish colonial era refers to the area’s dark soil, hence people calling it "
maitím" ("black"). Another folk etymology is the area was a forest burnt black in a fire, with only charred wood and ashes left. ;Masaya The barangay’s name
masayá means "happy". The upper part from the railway was part of Tranca, while the lower part towards town was part of Puypuy. When the railway was built in the early 20th century, a train station was built there, making it a commercial center for five barangays of upland Bay. Grocery stores, dress shops, hardware and
sari-sari stores sprouted around the train station, and the festive air had those leaving home for the place to say they were heading "
doón sa masayá" ("where it is happy"). ;Paciano Rizal Formerly known as Mainit ("hot"), and renamed after
Paciano Rizal, the eldest brother of national hero Dr.
José Rizal, who was said to have owned and lived on a farm in this barangay. ;Puypuy It was said a big meteor once fell in the area and natives reported a falling "fire" (Tagalog:
apóy), which Spaniards mispronounced as "puypuy". In 2010, a team of experts unearthed precolonial jars in the Barangay.
University of the Philippines Los Baños anthropologist and marine biologist Dr. Bonifacio Comandante, Jr, who led the team, suggested the objects indicate "there was a community here and they used the pots and jars for jar-burial", highly suggesting human habitation of the area as early as circa 800 B.C. ). ;San Antonio Named after
St. Anthony of Padua, it is where the original and first church of the town was situated. Folklore holds the church was submerged by Laguna de Bay when a super typhoon caused severe floods. The village celebrates the saint’s feast day on June 13. ;San Isidro Named after
St. Isidore the Labourer, the patron of farmworkers known for his piety toward the poor and animals. His feast day is on May 15. ;Santa Cruz Named after the
Holy Cross. ;Santo Domingo Name after
Saint Dominic Guzmán and Don Domingo Ordoveza, who once owned a large part of what was then
sitio Tabon. The name was given by Donato Ople, a longtime school principal in the town. The town holds two fiestas: one for its patron saint, Isidore the Labourer, on his feast of May 15; as well as its
foundation day and Tilapia Festival to celebrate the local
tilapia industry. It has one of the fast-growing economies in Bay as it has commercial buildings and subdivisions. It is also site of the first mall in town,
CityMall Bay. ;San Agustín (Población) Named after the town’s patron,
Saint Augustine of Hippo, it is one of the barangays that make up the town proper. It is the location of Saint Augustine of Hippo Parish, the Municipal Hall, and is among the busiest barangays given its convenience stores. It is near the town's new public market, "Pamilihang Bayan ng Bay". It is the home of the Tenorio's Bakery, widely famous for their
Monay Bay (also Monay Bae). ;San Nicolás (Población) Named after
Saint Nicholas of Tolentino, it is one of the barangay that makes up the town proper. ;Tagumpay Located in the shores of
Laguna de Bay, the barangay was formerly part of San Antonio, which became a separate barangay the moment it became independent. Tagumpay is one of the barangays in town which does not have a school that offers
secondary education. It retains the Tagumpay the same patron saint as San Antonio,
Saint Anthony of Padua. ;Tranca The population of Tranca grew from 2,017 in 1990 to 3,388 in 2020, an increase of 1,371 people over the course of 30 years. The latest census figures in 2020 denote a positive growth rate of 0.19%, or an increase of 30 people, from the previous population of 3,358 in 2015. ==Demographics==