Lin'an District is a suburban district of Hangzhou, Zhejiang, China. It is located in northwest Zhejiang as a separate urban area of Hangzhou, and borders Anhui province to the west and northwest. Lin'an held a population of 573,100 in 2014, over an area of 3,124 km2 (1,206 sq mi). The postal code is 311300, and the phone area code 0571.