Kathmandu District is a district located in Kathmandu Valley, Bagmati Province of Nepal. It is one of the seventy-seven districts of Nepal, covers an area of 413.69 km2 (159.73 sq mi), and is the most densely populated district of Nepal with 1,081,845 inhabitants in 2001, 1,744,240 in 2011 and 2,017,532 in 2021. The administrative headquarters of Kathmandu district is located in Kathmandu. The city has 21 post offices which handle mail from across the country and beyond, with Kathmandu DPO having 44,600 as its postal code for international mail delivery services like UPS or DHL Couriers etc.