It's hard to call these mills because they do not have published numbers. I do have one for Sam Hostetler's Mill on Egypt Road between Brockway and Brookville. 814-328-2763 and they do have an answering machine. Going from Brockway, before you get to the Hazen Fairgrounds, Egypt Road is just past the little Restaurant that just reopened. Turn right go about 4-5 miles. His sign is on the right and his house is at the very end of the lane. If there is no one at the mill, just go back to see if they are doing chores or if his son is working there that day. Knock on the door to the right and his wife will probably answer. Sometimes they are at community functions and the mill isn't manned. Call before you go. He has a really nice price sheet that you can order from. They are one of our favorite places to buy green lumber. None of what you find will be dried or planed and the dimensions are not exact but if you are a real carpenter with experience, you will do fine with it by using some common sense.
Now, the problem is that each mill works with a different kind of wood. His mill is Hemlock. If you know where another mill is located, just go there and ask what they cut. I think you can also go to Miller Furniture/Roofing/Chimneys near the Sykesville end of 410 and the Bank. They should be able to advise you, plus there is a business sheet if you can find it with some of the Amish businesses on it. The Saddle and Harness Shop on 410 should be able to help you too. There are also a couple of mills on 410 near what used to be Fye Park, past Dr Wise's Vet Clinic. They are all over the place but they usually don't advertise. I know of several more but can't accurately describe where they are located. One is in the back of a dairy farm but you would never know it is there. They are some of the kindest and most "real" people you will ever find. Once they get to know you, you will have friends for a lifetime.