Great Plains Cities

I'm a 22 year old man that's currently living in inland California, and I'm seriously considering moving to one of the Great Plains cities next year.

Here are the cities that I'm considering moving to:

• Fargo, ND
• Sioux Falls, SD
• Omaha, NE
• Des Moines, IA

My main question about these cities is this: what would I do for a living?