Johnsville is located in north California. Johnsville is part of Plumas County. Johnsville has 13.76 square miles of land area and 0.05 square miles of water area. As of 2010-2014, the total Johnsville population is 35, which has grown 66.67% since 2000. The population growth rate is much higher than the state average rate of 12.39% and is much higher than the national average rate of 11.61%. Johnsville median household income is $6,042 in 2000. Johnsville median house value is $108,900 in 2000. On average, the public school district that covers Johnsville is better than the state average in quality.