State by State Guide
As of May 2017, 32 states (including Washington D.C.) have passed benefit corporation legislation. Most states’ final laws closely resemble the benefit corporation model legislation, though a few deviate in significant ways. For an example comparison between contrasting requirements in Delaware and California regarding accountability, transparency and incorporation, see this two-part article (here and here).
Below is a state-by-state index of links to benefit corporation legislation and, where available, state-specific “How To Become a Benefit Corporation” guides created by B Lab.