Town Hall Address 2288 Mars Hill Rd. Irwin, PA 15642 United States- Westmoreland County Website http://www.sewickleytownship.org/ Tax Collector 724-446-5181 310 Sewickley Ave. Herminie, PA 15637 United States Zoning 724-446-7202 2288 Mars Hill Rd. Irwin, PA 15642 United States Fire District 724-446-3282 10 Sewickley Ave. Herminie, PA 15637 United States Sewer 724-446-7202 2288 Mars Hill Rd. Irwin, PA 15642 United States Town Hall Hours Monday - Friday: 8:00 A.M. - 3:30 P.M. County Westmoreland