Although not headquartered in Palm Beach County there is a significant number of aerospace focused facilities operating in the northern part of the county. Aerospace companies with facilities located within the county include United Technologies, Pratt & Whitney Rocketdyne, Sikorsky Aircraft, General Dynamics, Belcan Engineering Group and Lockheed Martin. Many of these companies rank among the top 100 employers for the county. The largest employer in Palm Beach County is The School District of Palm Beach County, with 27,168 employees, including more than 12,800 teachers.