Inchelium is located at 48°17'48" North, 118°11'44" West (48.296667, -118.195556).
According to the United States Census Bureau, the city has a total area of 26.55 mi2 (68.77 km2). 26.53 mi2 (68.70 km2) of it is land and 0.03 mi2 (0.07 km2) of it is covered by water. The total area is 0.10% water.
Inchelium is located in the Pacific Standard Time (PST) timezone, GMT-08:00. It observes Daylight Saving Time (DST).