In a large bowl, whisk together the sugar, flour, eggs, milk, melted butter, salt, and vanilla until well combined. Whisk in the coconut.
Divide the mixture between the two pie shells. Place the pies on 1 large or 2 small rimmed baking sheets. Bake for 45-50 minutes, until the tops of the pies are golden, puffed, and the centers are still slightly jiggly.
Let cool completely before slicing. Serve at room temperature or cold.