Jonathan Alder Local Schools Share: Education & Schools Jonathan Alder Local Schools Visit Website 9200 St. Rt. 42 S. Plain City, OH 43064 (614) 873-5621 (614) 873-8462 (fax) www.alder.k12.oh.us Hours: HS 7:30-2:34, JH 7:35-2:20,CMS 7:35-2:20,MES 8:50-3:30, PCES 8:48-3:26 About Map About Public School Directions From I-70, travel north on US-42 for 10 miles. The high school will be on your left.