Tri-State Envelope Corporation was established in 1966. We are a service-oriented multi location company dedicated to the suc ... cess of our growing customer base. Tri-State has manufacturing facilities in Ashland Pennsylvania, Beltsville Maryland and Wapello Iowa with a combined production capacity of 25,000,000 envelopes per day. We also have wide roll sheeting and AMC Die Cut capabilities in our Ringtown Pennsylvania plant. Tri-State manufactures a wide range of envelopes varying in size from 2.25” x 3.5” to 13” x 17”. All of our envelopes are manufactured to customer specifications, which include size, paper, printing, and window configuration. read more