Joppatowne High School 555 Joppa Farm Rd Joppa, MD 21085 Phone : (410) 612-1510 Business Category Schools Schools-Public Schools-Senior High Harford County--pupil Services, Schools, Joppatowne High Edgewood, MD 21040 Phone : (410) 612-1510 Business Category Schools Government Offices-County Government Offices & Public Schools Harford County--schools, Schools, Joppatowne High Edgewood, MD 21040 Phone : (410) 612-1510 Business Category Schools Government Offices-County Government Offices & Public Schools