It has a total land area of 45.75 square kilometers (17.66 sq mi), where its residents are composed of about 72% Tagalog people followed by 5% Bicolanos with a small percentage of foreign nationals.

[19] In 1762-1764 British occupation of Manila and surrounding suburbs the colonial government led by Simón de Anda y Salazar fled to Bacolor, Pampanga through Polo.

[22] A new road from Polo to Novaliches opened and traversed the barrios of Mabolo, Pasolo, Rincon, Malinta, Masisan, Paso de Blas, Canumay and Bagbaguin.

When Valenzuela was the chief editor, Fernández held a special role in the Katipunan as a printer of the Ang Kalayaan, the organization's official newspaper.

[25] The town joined other revolutionaries when the Philippine Revolution broke out in August 1896, while Valenzuela availed the amnesty offered by Spanish authorities few weeks later.

[26] One of the notable battles in Polo occurred in sitios Bitik and Pasong Balite in Pugad Baboy, where the locals won under the command of General Tiburcio de León y Gregorio.

[36] Polo comprised the northern barangays of Wawang Pulo, Poblacion, Palasan, Arkong Bato, Pariancillo Villa, Balangkas, Mabolo, Coloong, Malanday, Bisig, Tagalag, Rincon, Pasolo, Punturin, Bignay, Viente Reales, and Dalandanan.

Misinterpretation of property surveys and tax appropriation issues sparked the debate on which barangay should the municipal hall be belonged to: Karuhatan, Malinta, or Maysan.

In 2016, the Ombudsman ordered the dismissal of mayor Rex Gatchalian and other city officials due to grave misconduct and negligence of duty during the incident.

[50] To save the river, the Department of Environment and Natural Resources, Metropolitan Manila Development Authority and the local governments of Valenzuela and Malabon signed partnerships with private and non-government organizations to dredge the area.

[48][51][52] Increased climate variability, which is associated with global warming, has brought with it periods of heavy rainfall and high tides which in turn results in stagnant water which can stay in the area for up to 4 weeks due to insufficient drainage and improper solid waste disposal.

[60] As of 2020, the said ecotourism site is no longer the Villa Encarnacion today, as the area has been changed, and houses were built on the side of the main road and other residential developments.

St. Helena's feast day falls on August 8 but the anniversary of the finding of the Cross is on May 3, in the Philippines, this celebration took the form of the Mexican Santa Cruz de Mayo.

[79] Street dancing and procession along the city's major thoroughfares in commemoration of the feast of San Roque, highlighting the customs and traditional celebration of the festival.

There is an electronically controlled dancing fountain at the park entrance, an aero circle for zumba and other group exercises, garden, children's playground, zoological spaces where animals are displayed to the public, and a 400-seater amphitheater that can host a wide range of activities.

The park is adorned with hundred-years old luscious trees, fountain, memorial marker commemorating war veterans and statues of Pío Valenzuela and José Rizal.

[97] In English, Arkong Bato means "arch of stone" which was constructed and built by the Americans in 1910 to serve as borders between the provinces of Bulacan (where Valenzuela or Polo, as it was known before, belonged to) and Rizal.

[101] The shrine houses the wooden statue of Our Lady of Fatima, one of the fifty images blessed by Pope Paul VI in 1967 as part of golden celebration of the Marian apparition to three children in Fátima, Portugal.

In 1984, Cardinal Jaime Sin, Archbishop of Manila, finally claimed the statue and was then transferred under the custody Bahay Maria Foundation, a Philippine-based Marian organization.

[83] Located at Malanday, the Hearts of Jesus and Mary Parish Church, was erected on October 17, 1994, to replace the Santo Cristo Chapel, and solemnly declared on June 24, 2001.

[106] The Valenzuela boardwalk is a conversion of "Tagalag Fishing Village"s' 1.3-kilometer (0.81 mi) flood dike (protection) into a walkway with a bike trail, among other attractions.

[110] WIN ang Edukasyon Program was done in partnership with the Synergeia Foundation, a non-government organization that aims to improve education in local governments in the Philippines.

[111] At the same time, WIN ang Edukasyon Program also spearheads the yearly training of some mathematics and English language teachers assigned to Grades 1 and 2 pupils.

194 series of 2008 which authorized the government to purchase lots costing PhP 33M (or about US$750,000 as of April 2011) in nearby Children of Mary Immaculate College as part of the university's expansion.

[123] The city implements VC Cares Program which is designed for individuals who are unable to provide healthcare and basic necessities for themselves or meet special emergency situations of need.

[125] According to the 2002 Commission on Audit, the city reported accomplishment per health center ranging from as low as 42.26% to as high as 206% and vaccine utilization of 33% to 90% compared to normal 46% to 377% per basic requirements.

[126] There are swampy areas on Valenzuela and there is a stagnant water in Tullahan River on the south, which make citizens vulnerable to mosquito-linked diseases such as dengue and malaria.

[129] In September 2009, the Department of Health distributed free Olyset anti-dengue nets treated permethrin insecticide to Gen. T. de Leon High School.

[144] According to the 2002 Metro Manila Solid Waste Management Report of the Asian Development Bank (ADB), Valenzuela has the highest number of identified recycling companies in the region.

According to the study, the excess number of inmates in Metro Manila jails resulted into outbreak of various ailments such as psychiatric disorders, pulmonary tuberculosis and skin diseases.