You may be suprised that nearly all companies hire Mechanical Engineers, including Banks, supermarkets, and Wal-Mart. They would not be working at the stores. They would be at the warhouses or corporate offices and facilities working behind the scenes.
Here are a few others. Wawa, Lukoil, Mobil, airports, Boeing, Agusta Westland, Airbus, Lockheed Martin, Sony, Phillips, Westinghouse Electric, Panasonic, Ford, Chevy, Honda, Dodge, Jeep, Toyota, Volkswagen, Dell, Apple, Google, ABB, IBM, Coca Cola, Pepsi, Kraft, Hershey, Nabisco, LG, Fedex, UPS, NIH, government institutions and companies, defence contractors, the army, Hess, Getty, BP, Rockwell Automation, Good Year, Nintendo, JLG, Oshkosh Corporation, Johnson and Johnson, Air Products, Yamaha, Kawasaki, Home Depot, consultant companies, etc.
Mechanical Engineers can work in ANY industry in any engineering related field like construction, manufacturing, Research and Development, Design, and more.