Zêkog County (Standard Tibetan: རྩེ་ཁོག་, Wylie: rtse khog; Chinese: 泽库县 ; pinyin : Zékù Xiàn) is the second largest administrative subdivision by area within Huangnan Tibetan Autonomous Prefecture in Qinghai Province, China. The county has an area of 6658 square kilometres and a population of ~50,000 (2001), mainly Tibetan.