| 1876 | Archbishop Francis Norbert Blanchet appoints the Rev. Joseph E. Hermann to care for Catholics in Washington County. | |
| 1878 | An old log blockhouse, offered by John O'Brien, becomes first regular meeting place in the Cedar Mill area. | |
| 1879 | Land is purchased for proposed church. (This is present location of Pioneer Cemetery on Murray Road in Cedar Mill.) | |
| 1884 | Church is dedicated to St. Anthony of Padua by the Rev. Francis Fierens in absence of Archbishop Charles John Seghers. | |
| 1888 | St. Anthony School opens under direction of Dominican Sisters. | |
| 1893 | City of Beaverton is incorporated. | |
| 1895 | St. Anthony School opens under direction of the Sisters of Mercy of New Zealand. | |
| 1897 | St. Anthony School and sisters' home destroyed by fire in Cedar Mill. | |
| 1902 | Sts. Peter and Paul Mission Church on Cooper Mountain is dedicated. | |
| 1903 | Archbishop Alexander Christie purchases land in Beaverton to establish church there. | |
| 1906 | St. Anthony School in Cedar Mill destroyed by fire. | |
| 1908 | Church in Beaverton opens and is dedicated to St. Mary. | |
| 1911 | The Rev. T. J. Daum is named first resident pastor of St. Mary's. | |
| 1912 | The Rev. James Patrick O'Flynn becomes pastor and begins drive for funds to finance building of new church and school. | |
| 1913 | St. Cecilia Church and School is completed and dedicated at the site of what is now Damerow Ford - school opens under the direction of the Sisters of St. Mary of Oregon. | |
| 1915 | Priest's residence in Cedar Mill destroyed by fire. | |
| 1916 | Parish house built in Beaverton - this still stands as part of the Sunshine Gallery. | |
| 1917 | Last Mass said at St. Anthony's in Cedar Mill. | |
| 1918 | The Rev. Joseph M. O'Neill named pastor. | |
| 1926 | Archbishop Edward D. Howard appointed archbishop of Portland in Oregon. | |
| 1935 | The Rev. George O'Keefe named pastor - he purchased property where the present church stands. | |
| 1944 | The Rev. George Sniderhon becomes pastor - during his pastorate, the present church was built. | |
| 1949 | St. Cecilia Church is dedicated by Archbishop Howard. | |
| 1950 | The Rev. Anthony Gerace appointed pastor. | |
| 1951 | Interior finishing on the main body of the church is completed. The first unit of the school is complete and classes begin after Christmas holiday. | |
| 1952 | School is formally dedicated by Archbishop Edward D. Howard on Sunday, Feb. 24. | |
| 1953 | Construction of remainder of school is completed. | |
| 1954 | First Mass is said in St. Pius X Church in Cedar Mill. | |
| 1957 | Annex added to St. Cecilia Church. Fund-raiser for expansion is held - expansion plans call for convent, church in Aloha, and Cedar Hills area. | |
| 1959 | Open house is held in new St. Cecilia convent. | |
| 1960 | Budget appeal made for Cedar Hills, Aloha, and Beaverton churches. | |
| 1962 | Holy Trinity school building completed. | |
| 1963 | First Mass said at Holy Trinity on Palm Sunday. | |
| 1965 | Holy Trinity becomes separate parish. Rectory at St. Cecilia is completed. | |
| 1966 | Archbishop Edward D. Howard retires. Archbishop Robert Dwyer becomes the sixth Arch bishop of Portland in Oregon. | |
| 1974 | Archbishop Cornelius Power appointed to succeed Archbishop Robert Dwyer as Archbishop of Portland in Oregon. | |
| 1975 | The Rev. Anthony Gerace celebrates 25th anniversary as pastor of St. Cecilia Parish. | |
| 1976 | Parish celebrates 100 years of Catholic history in the area. |