Post Rock Extension District Address: 307 N Commercial St, Mankato, KS 66956 Phone: (785) 378-3174 Hours: Mon: 9am-5pm Tue: 9am-5pm Wed: 9am-5pm Thu: 9am-5pm Fri: 9am-5pm County Government Other Businesses: Rock Hills Jr & Sr High School at 109 E Main St, Mankato, KS 66956 Weltmer Phillips Law Office at 220 N Commercial St, Mankato, KS 66956 Darrell E Miller Law Office at 208 N Commercial St, Mankato, KS 66956 Buffalo Roam Steak House at 740 E South St, Mankato, KS 66956