ˌʌndɚ ðə nˈaɪntiːnhˈʌndɹɪd twˈɛnti fˈaɪv nˈʌmbɚɹɪŋ sˈɪstəm, pˌiːˈeɪ wˈʌnhˈʌndɹɪd θɹˈiː wʌzɐ spˈɜː ɹˈaʊt ʌvðɪ ɚɹˈɪdʒɪnəl pˌiːˈeɪ θɹˈiː, ðə wˈɪljəm pˈɛn hˈaɪweɪ.
Under the 1925 numbering system, PA 103 was a spur route of the original PA 3, the William Penn Highway.