Carlsborg is located at 48°5'26" North, 123°10'14" West (48.090556, -123.170556).
According to the United States Census Bureau, the city has a total area of 0.97 mi2 (2.51 km2). 0.97 mi2 (2.51 km2) of it is land and none of the area is covered by water.
Carlsborg is located in the Pacific Standard Time (PST) timezone, GMT-08:00. It observes Daylight Saving Time (DST).