Northrop Grumman

(7,100 Linthicum employees)

The electronics sector of this California defense company is based in Anne Arundel County. This sector is responsible for the design, development and manufacture of defense electronics, precision weapons and air space management systems.

www.northropgrumman.com

Southwest Airlines

(2,425 Linthicum employees)

The East Coast flight center for this Dallas-based airline is located at the Baltimore-Washington International Airport and flies nearly half of the passengers at the airport. The airline, known for its low fares, has been a presence at BWI for about 10 years.

www.southwest.com

Anne Arundel Health System Inc.

(2,000 Annapolis employees)

A not-for-profit hospital and medical services network. The Anne Arundel Medical Center treats patients in Anne Arundel County and the surrounding communities. About two years ago, the hospital moved from its 100-year-old downtown Annapolis location to a spacious medical park on the outskirts of the city.

www.aa-healthsystem.org/

North Arundel Health System

(1,700 employees in Glen Burnie)

North Arundel Hospital, part of this not-for-profit hospital and medical services network, recently opened its new Tate Cancer Center, representing the largest free-standing construction project in the hospital's history.

www.northarundel.org

ARINC

(1,500 Annapolis employees)

Annapolis is the headquarters of this national defense contractor, which provides transportation communications and systems engineering for the government and the aviation, airports, defense and transportation industries. The company has 3,000 employees in 50 offices around the world.