Headquarters: Cottage Grove, MN, USA
2010 Revenue ($ millions): 26,662
Rank: 16

What makes it so great?

"There is a [constant] sense of positivity and fairness," at 3M, says an employee. And it seems there's also a focus on healthy habits: Managers bring in fruit every week, and the company sponsors an employee "pedometer challenge" -- 10,000 steps per day -- to raise money for charity.

In Austria, the company keeps creativity alive with an Innovation Competition for employees, which boasts €500 cash awards and trips to the United States, London, and Berlin. "3M is the most ethical and transparent company that I've ever worked for," says the employee.

Last updated October 28 2011: 4:50 PM ET