City of Johnsville, California

Johnsville is located at 39°45'38" North, 120°41'39" West (39.760833, -120.694167).

According to the United States Census Bureau, the city has a total area of 13.81 mi² (35.76 km²). 13.76 mi² (35.64 km²) of it is land and 0.05 mi² (0.13 km²) of it is covered by water. The total area is 0.35% water.

Johnsville is located in the Pacific Standard Time (PST) timezone, GMT-08:00. It observes Daylight Saving Time (DST).