If your company operates in more than one US state, you can incorporate in any of these states. What our clients usually end up doing is a process called Foreign Qualification.
An LLC or Corporation conducting business in one state when incorporated into another is considered a foreign corporation and must qualify as a foreign corporation to do business legally in that state.
For example, a company incorporated in Nevada that wants to do business in California would be considered a foreign corporation in California and as a result, the corporation in Nevada must qualify (or register) as a foreign company to do business in California.