| Year | Event |
| 1868 | July 16: Arrival and choosing of site for village by Dubuque settlers, Feast of Our Lady of Mount Carmel |
| | Building of church begins |
| | County store, blacksmith shop and wagon-maker located here |
| | Father Henry J. Heimbucher, first pastor arrives |
| 1869 | Three room cottage built for Father Heimbucher |
| | July 16: Mass offered in new church in honor of Our Lady of Mount Carmel |
| 1874 | Father John Kempker assumes pastoral duties at Mount Carmel |
| | Addition to Church at Mount Carmel |
| | Mission established at Roselle, Arcadia, Carroll & Sac City |
| | School begun at Mount Carmel with Catholic lay teacher |
| | Build Holy Angels Church at Roselle |
| | Build St. John's Church at Arcadia |
| | Build St. Joseph's Church at Carroll |
| 1877 | October 3: Dedication of Mount Carmel cemetery was solemnized |
| 1879 | St. Bernard Parish is formed & church is built at Breda |
| 1880 | Franciscan Sisters of LaCrosse, Wisconsin send four sisters to Mount Carmel to conduct school |
| | Annunciation Parish formed and church built at Coon Rapids |
| 1881 | New Church built at Mount Carmel |
| 1882 | St. Mary's Parish at Willey established as a mission of Roselle |
| 1883 | Church at Mount Carmel is destroyed by fire, cause unknown |
| | New church built at Mount Carmel |
| | Sacred Heart Parish is formed and church is constructed at Templeton |
| | A bell weighing 4,552 pounds with fixtures was installed in the belfry of the new church |
| 1885 | Sts Peter and Paul Parish formed at Carroll |
| 1891 | St. Joseph Parish formed & church constructed at Dedham |
| 1892 | Month of May, fire destroys Mount Carmel church, cause was lightning |
| 1893 | New Church built at Mount Carmel |
| 1894 | Mount Carmel celebrates Silver Jubilee |
| 1898 | Sacred Heart Church at Manning gets first pastor |
| 1901 | St. Augustine's Parish at Halbur is established |
| 1902 | Diocese of Sioux City is formed |
| 1904 | St. Francis Parish at Maple River is established |
| 1906 | Fire destroys Mount Carmel Parish church, caused believed to be spontaneous combustion of coal |
| 1907 | New parish church is completed at Mount Carmel |
| 1912 | New Parish school and convent are erected at Mount Carmel; high school is introduced at this time |
| 1914 | Holy Family Parish is formed at Lidderdale |
| 1916 | St. Laurence Church is stablished at Carroll |
| 1918 | Electric Power is installed for parish buildings at Mount Carmel |
| 1919 | Golden Jubilee is celebrated at Mount Carmel, July 16, Feast of Our Lady of Mt. Carmel |
| 1944 | Diamond Jubilee is celebrated at Mount Carmel, August 15, Feast of the Assumption of the Virgin Mary into Heaven |
| 1947 | Mount Carmel High School begins full four year program |
| 1948 | First Senior Class graduates at Mount Carmel |
| 1949 | New rectory completed at Mount Carmel |
| 1950 | New gym-auditorium completed |
| 1958 | Last class to graduate from Mount Carmel High School |
| | High School students of Mount Carmel begin attending Kuenper High School in Carroll in the Fall |
| 1967 | Lidderdale & Maple River parishes unite parochial schools with Mount Carmel |
| 1969 | Centennial Jubilee, July 16, Feast of Our Lady of Mount Carmel |
