| 1870s | Catholic families move into the Township of Newark Valley |
| 1881 | Newly built church dedicated to St John the Evangelist on January 8 |
| 1881 | The parish started as a mission church of St Patrick in Owego |
| 1909 | August 18 Certificate of Incorporation for St John Parish |
| 1914 | Bp Thomas Hickey gave St John more independent status |
| 1914 | Fr John Hogan placed in charge of congregation |
| 1929 | Fr Callistus Szpara, Polish Franciscan, appointed assistant at St Patrick to minister to St John |
| 1931 | Fr Ignatius Klejna, Polish diocesan priest appointed |
| 1934 | Fr Klejna died, no Polish-speaking priests, so St John’s reverts back to mission of St Patrick |
| 1934–45 | Bp appoints Polish-speaking assistants to St Patrick |
| 1941 | Church extended 25 feet to form present sanctuary, parish hall constructed |
| 1945–54 | Fr Alexander Stec appointed pastor, new rectory built |
| 1959–73 | Fr Matthew Siudara appointed pastor; 2nd Vatican Council calls for changes to sanctuary |
| 1973–77 | Fr Robert Donovan appointed pastor; rectory remodeled, office space & classrooms added |
| 1977–82 | Fr Eugene Weis appointed pastor |
| 1981 | November 7 Bp Matthew H. Clark celebrated Centennial liturgy with dinner afterward |
| 1982-86 | Fr Ralph Fraats appointed pastor |
| 1986-93 | Fr Joseph McCaffrey appointed pastor; rectory sided, new roof installed |
| 1993–present | Fr William A Moorby appointed pastor; new statue installed in remodeled sanctuary |
| 1996 | Church rededicated by Bp Matthew H. Clark |
| 2003 | Blessed Trinity Parish formed |
