The Library will most likely not take them. They are too old, and most libraries are overwhelmed with magazines which are donated (but of course, ask anyway). BUT, I would say a Government Teachers at a few high schools would love to use them as teaching ideas. But, you may need to spread them out a little. How about an economics teacher also.
Try a homeless or abuse shelter. Yes, they like to read at night (they are not allowed to do much else at night). Most people donate crap magazines to the homeless shelters, I like to think that if I donate "real" magazines to the shelters, then not only will it increase knowledge of their area, but also reading skills. If you can just help one person learn to read better, that will increase their ability to find a job tenfold.
Elderly homes. Their are alot of people in Elderly homes who love to read about their Government.
Girl Scouts & Boy Scouts - They have to do Government Badges.
DRs Offices, especially the crowded ones with Seniors.
The Free Clinic in your area - They are always backed up and many people sit and wait for hours.
Mechanic Shops - the ones which take longer.
Social Services Office - again, a place where people sit for hours, and they need something to read that is not "People".
Spread the magazines out among these places and watch your seeds of knowledge grow! A senior may write a letter, an unemployed Mom may find a name she knows which can help her find a job, a Homeless man may find he wants to learn to read, an Abused family may find they have the strength to leave for good, and a Girl Scout / Boy Scout may read your magazines and realize they want to grow up and change the world.