mˈoʊst nˈoʊɾəbəl ʌv ðiːz ɑːɹ ðɪ ˈænjuːəl ɛkstʃˈeɪndʒ pɹˈoʊɡɹæmz wɪððɪ ˌʌpɚ dˈʌblɪn hˈaɪ skˈuːl ɪn pˌɛnsɪlvˈeɪniə, ænd ðɪ ɛkstʃˈeɪndʒ tɹˈɪps wɪððɪ ᵻlˈɪzəbəθlˈæŋɡæsɚdʒɪmnˈæsiəm, ɐlzˈaɪ dʒˈɜːməni, ænd ðɪ ɪkˈoʊldʒˈuːlzfˈɛɹi, kˈɑːsnɪkˈɜːzsˈɜːlwˈɑːɹ, fɹˈæns, dˈuː tə hˈɑːɹpɛndənz ˈoʊn kənˈɛkʃənz wɪððə ɹˈɛlətˌɪv tˈaʊnz.
Most notable of these are the annual exchange programmes with the Upper Dublin High School in Pennsylvania, and the exchange trips with the Elizabeth-Langasser-Gymnassium, Alzey Germany, and the École-Jules-Ferry, Cosne-Cours-sur-Loire, France, due to Harpendens own connections with the relative towns.