Deli Serdang Regency is a regency in the Indonesian province of North Sumatra. It surrounds the city of Medan, and also borders to the west the city of Binjai, which is effectively a bedroom community for Medan. The entire regency lies within the Medan metropolitan area. It occupies an area of 2,579.98 km2. Its administrative center is Lubuk Pakam, which is located approximately 30 km east of Medan. The national census of 2000 recorded 1,573,987 people, but by 2010 the regency's population increased by 13.76% to 1,790,431, and at the 2020 Census the total was 1,931,441. The official estimate as of mid-2025 was 2,078,046, of whom 65.1% lived in the western 53.6% of the area, surrounding Medan city, while 34.9% lived in the eastern 46.4% of the area. Medan's Kualanamu International Airport is located in this regency, 23 kilometres (14 mi) east of downtown Medan.