Residential & Commercial Hill Asphalt is Northwest Ohio's premiere asphalt maintenance company. We have been in business over 35 years and have thousands of satisfied customers all over Ohio, Michigan & Indiana. Is your asphalt in need of maintenance? Hill Asphalt is Northwest Ohio's premiere asphalt maintenance company. Then look no further because Hill Asphalt has the answer to your asphalt's need, specializing in; Sealcoating, Crack Filling and Striping. The parking lot is the first and last part of a building complex to be viewed by your patrons.