Jainca County, Chentsa County or Jainzha County (; ) is a county in Huangnan Tibetan Autonomous Prefecture in Qinghai Province, China, to Tibetans in the area known as Malho Prefecture, part of Amdo. There are six townships, three towns and a total of 79 administrative villages in Chentsa county. The county has an area of and a population of ~50,000 (2001), 67% Tibetan. The county seat is the town of Markhu Thang.
Jainca County is made up of 3 towns and 6 townships:
Jainca County has a cold semi-arid climate (Köppen BSk) and , at , on July 24, 2000.