A) Population Size
As of May, 2000, population was 76,145.
B) Urban/Rural Distribution
Dinalupihan is predominantly a rural area. The urban area consist of thirteen (13) barangays with 10.04% of the total population of the municipality as against its rural population comprising 89.96%.
C) Population Density
The municipality was registered at 1,215.146 persons per hectare in the year 2000.
D) Sex and Age Structure
Like the rest of the country, the young population of Dinalupihan, Bataan exhibited a pyramidal age structure. Population between the ages of 1-14 years old accounts for 40.44% of the total population, 15-64 years old comprises 56.79%, and only 2.8% are in the are bracket of 65 years old and above. In terms of sex distribution, out of 46 barangays, 10 barangays slightly outnumbered females. Sex ratio is approximately a male per one (1) female.
E) Dialect/Language Spoken
About 75.90% speaks Tagalog while Kapampangan is spoken about 19.35% of the population. There are minor groups of Visayas and Ilocano.
The Roman Catholics comprised almost 90 percent of the total citizenry in Dinalupihan. The Dominicans and other Secular priests were really successful in their untiring efforts to propagate Christianity in Dinalupihan, and Bataan, in general. The present St. John the Baptist Parish, built in 1839, is the center of the religious activities of the Catholics in Dinalupihan. Other churches and chapels were also built in various parts of the town, namely the St. Raymund Nonnatus Church in San Ramon, Our Lady of Lourdes in Colo, San Isidro in Daang Bago, St. Joseph in San Jose, Kapilya ni Sta. Lucia in Pita, St. Thomas of Aquinas in Pagalanggang, Our Lady of Fatima in Happy Valley and Kataasan, San Isidro Labrador in Luacan and many others. The Iglesia ni Cristo, the second biggest religious organization in town, has five INC chapels, namely in Barangays Luacan, Daang Bago, San Benito, Roosevelt and Naparing. The biggest and newest chapel is located in Daang Bago. Other significant Christian groups which blossomed in Dinalupihan include the Baptists, Mormons (Church of the Latter Day Saints), Aglipayans, Methodists, Jehovah’s Witnesses, Dating Daan, and Born-Again Christians. It is believed that a small number of Muslims have also made Dinalupihan their home. The Church of Latter Day Saints has a beautiful religious prayer hall in San Ramon, in the vicinity of the municipal building.
Literacy rate in the municipality is 93.14%, which means that 5 years old and over are literate while 9.44% of the school age-population have no grade completed.
H) The Aetas
The Aetas, otherwise known as “Ita” are the aborigines of Dinalupihan. They have no fixed homes and wandered from place to place in search of food. As early as the Spanish time, the Church and the government authorities have already tried to confine the Aetas in communities near the center of established towns but they always returned to their mountainous abode. The present generation of Aetas residing in Dinalupihan live in established minority communities located in barangays Bayan-bayanan, Payangan and Tubo-tubo. At present, there are some 600 Aetas in Dinalupihan whose children are attending primary classes in their respective barangay.