Maybe someone from Atlanta can weigh in on your specific question, but here's some food for thought on your reason for wanting a specific type of charity:
Places like Goodwill don't 'sell them and just keep the money.' They have a huge level of organization that employs people down on their luck, lack of job skills or experience, recovering from various disasters, etc. They aren't just a 'selling stuff' place, they are do extensive job training with people who may be otherwise unemployable for different reasons. They also have associated programs to connect employers with people who have learned job skills in prison.
So yeah, you could make a dozen phone calls and find an organization that works with homeless people and can find 40 or 50 people who have your shoe size and could use the type of shoes you're giving away. This would be a whole lot of time and effort on the part of several people. Or you could find an organization such as Goodwill, and those shoes may help more people than you know. Someone has to price them, and stock them, and sweep the floor under the shelf, and ring them up for a customer who may be just a bargain-hunter, or who may be a young man on his way to a job interview who needs a great pair of shoes but couldn't otherwise afford them - until he found yours.
Cheers.