Full Service Company, Quality Crafted Signs Design, manufacture, erect and maintain. Penn Sign Company has proudly served thousands of south central Pennsylvania businesses for more than 30 years crafting the signs you see everyday. Our Committment The Penn Sign Company has been committed to manufacturing signs that withstand the test of time. Using only quality materials and components, our product is produced entirely in-house. From conception to completion, you can expect personal, friendly service from any one of our employees, each of which, have at least 12 years experience with our company.