OP I love what you are doing and have wondered this myself, I too am wanting to do something similar.
I grew up a Jehovahs Witness, and they are always leaving their brochures, magazines and other literature where there are other magazines such as in laundromats, waiting rooms, bathrooms, etc. They just take it out of their purse or pocket, start reading it, and then just set it down and leave it. Or if no one is around then they just set it there lol.
You could also put some of them with other pamphlets in offices like WIC offices/waiting areas, at the court house, community health centers, etc. At these places where I live, there is always a wall full of different pamphlets on things like vaccines(the "benefits" of course), womens health, etc. I have even seen pamphlets in Walmart. So you could just take over one of the slots with your pamphlets! Oh now I am feeling inspired, I want to do this where I live!
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