| Cilegon | |
| Official Name: | City of Cilegon |
| Translit Lang1: | Name |
| Translit Lang1 Type2: | Sundanese |
| Nickname: | Steel City |
| Motto: | Akur Sedulur Jujur Adil Makmur (Get along with fellows; honest, fair, and prosperous) |
| Settlement Type: | City |
| Pushpin Map: | Indonesia_Java#Indonesia |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Java and Indonesia |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Java |
| Subdivision Type2: | Province |
| Leader Title: | Mayor |
| Leader Name: | Helldy Agustian |
| Leader Title1: | Vice Mayor |
| Leader Name1: | Sanuji Pentamarta |
| Established Title: | Administrative City |
| Established Date: | 1987 |
| Established Title2: | Municipality |
| Established Date2: | 27 April 1999 |
| Established Title3: | City |
| Established Date3: | 4 September 1999 [1] |
| Area Total Km2: | 162.51 |
| Population As Of: | mid 2023 estimate |
| Population Note: | [2] |
| Population Total: | 470378 |
| Population Density Km2: | auto |
| Timezone: | Indonesia Western Time |
| Utc Offset: | +7 |
| Coordinates: | -6.0027°N 106.0112°W |
| Postal Code Type: | Postcodes |
| Postal Code: | 42400 |
| Area Code Type: | Area code |
| Area Code: | (+62) 254 |
Cilegon (Indonesian: Kota Cilegon, Sundanese:) is a major coastal industrial city in Banten province, Indonesia, covering . It is located on the island of Java. The city had a population of 374,464 at the 2010 Census[3] and 434,896 at the 2020 Census;[4] the official estimate as at mid 2023 was 470,378.[5]
Among the factories located in Cilegon are the Krakatau Steel Company, a vital company in Indonesia, which produces steel for industrial (domestic and foreign) needs, and the Asahimas Chemical Company. The nickname for Cilegon is "Steel City" since the city is the largest steel producer in Southeast Asia, about 6 million tons of steel produced each year in the Industrial Area Krakatau Steel, Cilegon. Additionally Cilegon is one of the vital assets of the state, because in this town there is a wide range of important objects such as the Merak Harbour, the Krakatau Steel Industrial Zone (including the PT. Krakatau Steel Tbk, Asahimas, Siemens, KS - POSCO joint venture, Chandra Asri, and Pertamina), PLTU Suralaya, Power plant Krakatau, Krakatau Tirta Industrial Water Treatment Plant, the Sunda Strait Bridge Construction (Lot Plan) & Sunda Strait Industrial Zones.
Cilegon is located on the most northwest coast of Java island, at the mouth of the Cilegon River on Ciwandan Bay, which is an inlet of the Sunda Strait. It is administratively a semi-enclave within Serang Regency, as it borders with Serang Regency in the east and south, while it borders with Sunda Strait in the north and west.
The City of Cilegon is divided into eight districts (kecamatan), tabulated below with their areas and their populations at the 2010 Census[6] and the 2020 Census,[7] together with the official estimates as at mid 2023.[8] The table also includes the locations of the district administrative centres, the number of administrative villages (all classed as urban kelurahan) in each district, and its postal codes.
| Kode Wilayah | of District (kecamatan) | Area in km2 | Pop'n Census 2010 | Pop'n Census 2020 | Pop'n Estimate mid 2023 | Admin centre | No. of villages | Post codes | |
|---|---|---|---|---|---|---|---|---|---|
| 36.72.04 | Ciwandan [9] | 33.33 | 42,921 | 50,058 | 53,574 | Tegal Ratu | 6 | 42441 - 42447 | |
| 36.72.08 | Citangkil [10] | 25.90 | 65,073 | 79,903 | 85,850 | Kebonsari | 7 | 42441 - 42444 | |
| 36.72.03 | Pulomerak (a) [11] | 25.70 | 43,060 | 48,373 | 50,791 | Lebak Gede | 4 | 42431 - 42439 | |
| 36.72.07 | Purwakarta [12] | 16.60 | 38,479 | 42,658 | 44,048 | Purwakarta | 6 | 42431 - 42437 | |
| 36.72.06 | Grogol [13] | 23.71 | 38,538 | 42,442 | 46,134 | Rawa Arum | 4 | 42436 - 42438 | |
| 36.72.02 | Cilegon (district) [14] | 8.21 | 39,465 | 46,327 | 53,199 | Ciwaduk | 5 | 42415 - 42419 | |
| 36.72.05 | Jombang [15] | 10.31 | 60,415 | 65,431 | 71,730 | Jombang Wetan | 5 | 42411 - 42416 | |
| 36.72.01 | Cibeber [16] | 18.80 | 46,608 | 59,704 | 65,052 | Kalitimbang | 6 | 42422 - 42427 | |
| Totals | 162.51 | 374,464 | 434,896 | 470,378 | 43 |
Notes: (a) including 5 small offshore islands.
Cilegon has a hot and humid climate near the boundary between tropical rainforest (Af) and tropical monsoon climate (Am) according to the Köppen climate classification system. Despite being located relatively close to the equator, the city has distinct wet and dry seasons. The wet season in Cilegon covers the majority of the year, running from October through May. The remaining four months forms the city's dry season. Located in the most western part of Java, Cilegon's wet season rainfall peak is January with average monthly rainfall of, and its dry season low point is August with a monthly average of .
From 1991 to 2005 the population of Cilegon grew 47.18%, an average of 2.66% per year.
Cilegon is the fourth largest city in Banten. The high population growth rate of Cilegon is primarily caused by migrants entering the city.
In 2019 there are 382 mosques and 287 musallas in Cilegon, without any churches, Hindu temples, or Buddhist viharas, even though there are 6,740 Protestants, 1,743 Catholics, 215 Hindus, 215 Buddhists, and 7 Confucians in the city. A proposal to build a Batak Protestant Christian Church in Cilegon was rejected by local residents, which forces religious services to be conducted in Serang City.[17]