Thoracic cavity: Thoracic cavity, the second largest hollow space of the body. It is enclosed by the ribs, the vertebral column, and the sternum, or breastbone, and is separated from the
Map of ZIP Code. ZIP code 92407 is centered in San Bernardino County and overlaps Medical Service Study Area(s) 151e, 151e, 151g, 151g, 146, 146, 147, 147, 148 and 148.
There is no municipal organization for the area, and all fire, water, and police service is provided by San Bernardino County. The ZIP code for the community is 92386, the area code 909, and the population is 1,816. Big Bear High School is located in the northern part of the community. The name of the town is taken from the nearby mountain, Sugarloaf. The mountain is so called because it appeared to some to bear a resemblance to a sugarloaf. (In settlement days sugar was sold in pieces of a loaf.)