Sidoarjo Regency

Sidoarjo Regency (Javanese: ꦑꦧꦸꦥꦠꦺꦤ꧀ꦱꦶꦢꦲꦂꦗ, romanized: Kabupatèn Sidaharja) is a regency in East Java, Indonesia. The regency has its capital in the Sidoarjo District and covers an area of approximately 719.34 km², making it the geographically smallest regency in the province. Nevertheless, Sidoarjo is densely populated, with an estimated 2,027,874 residents as of mid-2024 (about 2,800 people per km²). Its location south of Surabaya makes it an integral part of the Gerbangkertosusila metropolitan area, sharing borders with Surabaya, Gresik, Pasuruan, Mojokerto, and the Madura Strait.

Administratively, Sidoarjo Regency is divided into 18 districts, 28 urban villages (kelurahan), and 318 rural villages (desa). The most densely populated districts are located in the northern part, such as Waru and Taman, which serve as gateways to Surabaya and centers of urbanization. Meanwhile, coastal areas like Sedati and Porong lie at low elevations (0–3 meters) and are characterized by shrimp and milkfish ponds — which is why Sidoarjo is nicknamed the “Delta City” and the “Shrimp City.”

Sidoarjo Regency traces its roots deep into the layers of ancient Javanese history — the region was originally part of the Kahuripan kingdom founded by Airlangga around 1019, with its capital at the mouth of the Brantas River, before it was divided into two kingdoms, Janggala and Kadiri, in 1045. As part of Janggala, its ancient capital was located in Hujung Galuh (now partly within Sidoarjo and Surabaya), which developed into a major port for the Majapahit Empire in the 14th century. Traces of this era are still visible in structures like Pari Temple (established around 1371 during the reign of Hayam Wuruk) and Dermo Temple (believed to date from the mid-14th century), which showcase the distinctive red-brick architecture of Majapahit and stand as symbols of a glorious past.

Sidoarjo Regency plays an increasingly important economic role as a major satellite city of Surabaya, marked by the presence of Juanda International Airport in Sedati — one of the busiest air gateways in Indonesia, handling around 14 million passengers annually, making it the third-busiest airport in the country. The area's accessibility is enhanced by dedicated toll roads such as the Waru–Juanda Toll Road, which directly connects to the airport, as well as the Surabaya–Gempol Toll Road, which facilitates southbound distribution and improves the mobility of goods and people. In Sidoarjo’s urban center, the economic vibrancy is reflected in the numerous modern shopping centers: Lippo Plaza, Ciplaz Sidoarjo, Transmart Carrefour, and the Suncity Superblock.

Sidoarjo Regency ranks highly in the Human Development Index (HDI) category in both East Java and Indonesia. In 2024, Sidoarjo’s HDI reached 82.31, placing it fourth in East Java after the cities of Malang, Surabaya, and Madiun, and categorizing it as “very high.”