Do I have to file S-Corp return in multiple states?

Incorporated in California. One partner moved to Hawaii last year, where payroll taxes, income tax withholding, sales tax etc. have been set up. Other partner remained in CA. Business is a website with customers located throughout the country, including CA and HI.

Does the corporation have to file corporate returns in both states?

In case it matters, we're technically a LLC electing to file as a S-Corp.