What is now the town of Guimba was once a vast ecological rainforest which was part of the Central Luzon Rainforest during precolonial time, before the arrival of the Spanish. The area is believed to be inhabited by no permanent communities, rather, it is inhabited by hunter-gatherer societies, mainly Ilonggots. The area was once part of the huge territory that the Empire of Tondo, with its capital in a much forested Manila. In the collapse of the Empire of Tondo after the subjugation of Brunei, the area transitioned into a free zone once again, where hunter-gatherers abounded. The area is also believed to once have been visited by migrating Aetas, Cordillerans, Ilokanos, and Ilonggots. The first Ilocano settlers, arriving in wooden carts and horsebacks, cleared the thick forests and planted the first rice seeds on February 20, 1865, according to an old record found by Guimba's former Parish priest, Rev. Agustin "Gus" Polong, MSC. They called the area 'San Juan de Guimba' in honor of the patron saint the settlers brought from Ilocos, San Juan, and combined it with the pot-making industry called 'gebba' which they used to do in the old land. Since then, rice became the primary agricultural crop in the area. Due to this, it became the province of Nueva Ecija's traditional top rice-producing area in the 20th century. More settlers arrived mostly from the towns of
Bacarra,
Paoay, and
Candon in the Ilocos. Among the families who came were the Galapons, Mateos, Cudals, Padres, Cayogs, Romanos, Silvestres, Capinpuyans, Batangans, Faigals, Ramoses, Sumawangs, and Catabonas. What would be the town of Guimba was a relatively organized community when the Spanish colonialists arrived and appointed Don Luis De Ocampo as the first Gobernadorcillo, and later, Don Pablo Ramos and Santiago Cudal. The Spanish left and the Americans came and in 1912, the town's name was abbreviated to Guimba with Don Alfonso Faigal as the first Alcalde Mayor. St. John the Evangelist remained its patron saint. The first municipal hall was also built during this year in what is now known as Faigal Street. The Plaza Municipal evolved and what became the public market opened. A foot bridge was constructed during the administration of the late Agustin Vigilia, Alcalde Mayor. This foot bridge was constructed across the Binituran River leading to the northern barrios like San Andres, Balbalino, Guiset, Baybayabas, Cinence, Nangabulan to barangay Talugtug from the Parairo Street. Later, the bridge was demolished and transferred to the present site north of Faigal St. This was known as Faigal Bridge going to the north, to the municipality of
Talugtug. Other infrastructures were put up with the public market and cleared the space for the Municipal Plaza, now the midtown municipal park. In 1941, during the Japanese regime, Juan Villamar was appointed Municipal Mayor. During World War II, the Imperial Japanese military forces entered and occupied Guimba in 1942. At daybreak of January 26, to February 15, 1945, advance reconnaissance units of the American troops under the U.S. Army 6th Infantry Division and aided by the local Filipino soldiers of the Philippine Commonwealth Army 2nd, 22nd, 25th and 26th Infantry Division liberated Guimba and, within hours, established outposts nine miles farther to the east along the Licab River and La Paz. Combined U.S. and Philippine Commonwealth military forces liberated the town of Guimba in 1945 and ended World War II. In 1963, Dr. Virgilio Calica was the Mayor and it was during his term that the old Municipal Hall was constructed, the present site of the present municipal hall constructed in year 2004. This building was demolished during the administration of Jose Bopet Dizon and the new Municipal Hall was constructed and occupied in 2006. In 2006, Guimba became a first class municipality. ==Geography==