When I lived in Greeley, Colorado if I wanted to mail a letter to the other side of town( 120,000) My letter would go from the Post Office here to Brighton, Colorado 35 Miles away then back to Greeley to be delivered.
That's pretty typical the way it's done.
Has to got to a postal facility to "sort" it out.
Same thing here.
Goes from the local post office, then down the highway, about 20 miles, on the other side of town, then back to this post office, all over again.
