The Oregon Legislature’s 2014 SB 1531 is the bill of the hour (and the day and maybe the Session) and the Oregonian has been tracking the story, along with other news sources around the state. Many Oregon cities and communities are debating the issue and some have already passed laws.
The Oregonian has (among other medical marijuana articles) this useful 2/14/14 compilation of local laws: Medical marijuana: Oregon cities that have banned dispensaries
The Municipal Research and Services Center of Washington (state) has their own compilation of medical marijuana laws.
And Americans for Safe Access has other information and compilations of laws from all states.