Sidoarjo Regency
![](/Images/godic/202502/11/Coat_of_Arms_of_Sidoarjo_Regency0454.png")
![](/Images/godic/202502/11/Locator_kabupaten_sidoarjo0454.png")
![The daily low (blue) and high (red) temperature during 2015 with the area between them shaded gray and superimposed over the corresponding averages (thick lines), and with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile). The bar at the top of the graph is red where both the daily high and low are above average, blue where they are both below average, and white otherwise.](/Images/godic/202502/11/Temperature_temperature_c0454.png")
![](/Images/godic/202502/11/Humidity_percent_pct0454.png")
Sidoarjo Regency is a regency (kabupaten) of East Java, Indonesia.
Sidoarjo Regency is bordered by Surabaya city and Gresik Regency to the north, by Pasuruan Regency to the south, by Mojokerto Regency to the west and by the Madura Strait to the east. It has an area of 634.89 km², making it the smallest regency in East Java. As at the 2010 Census, Sidoarjo Regency had a population of 1,941,497; the latest official estimate (as at 2014) is 1,996,034. The regency is part of the urban region surrounding Surabaya, known as 'Gerbangkertosusila' area.