The present St Casimir School building was constructed during the 17-year pastorate of Father Louis Phillips, and completed in 1946. The lower level of the building, named Seton Hall, also provided a spacious and well-supplied social area for the parishioners. A suitable home was located to serve as a convent for the Felician Sisters of Corapolis, PA.

When Father Patrick Maher was appointed pastor in 1952, he began to refurbish the church building, which was completed in time for the Golden Jubilee of the parish on May 21, 1955. He also opened a new section of the cemetery, and purchased another home (directly across the street from the school) to be remodeled as a convent for the Sisters.

During the administration of the next pastor, Rev. Edward Kakascik, the remodeling of the convent was completed, and the Sisters took up residency in December, 1958. It was also during these years of Father Kakascik's tenure that Vatican Council II promulgated liturgical renewal.  The parishioners of St Casimir responded favorably, and in November, 1964, the liturgical changes began to be implemented. In the meantime, plans for constructing a new church were in the making. Thanks to the generous pledges made by the people to the building fund, Bishop John King Mussio, Bishop of Steubenville, granted permission to begin construction of a much-needed new church and rectory in 1966. The dedication and consecration of the beautiful new house of worship was held on April 29, 1969, amid great rejoicing. This solemn ceremony was a re-affirmation of the strong faith of the parishioners which motivated them to make the necessary sacrifices to bring about the realization of  their "dream." The scholastic year of 1969-1970 also saw the formation of a merger between the parish school and that of St Adalbert School, Dillonvale. The two schools were renamed the Adena-Dillonvale Catholic Consolidation.

On April 9, 1973, Rev. Francis Baudo succeeded Rev. Edward Kakascik as pastor of St Casimir. He proceeded with the plans for the previously proposed construction of a new rectory, which was dedicated on November 9, 1975. He also had remodeled one of the existing confessionals into a combination Reconciliation Room/"Cry Room."  In 1978, with great regret, the Felician Sisters were complelled to withdraw from the Adena-Dillonvale Catholic School. However, the school continued to function, thanks to the commitment of its lay faculty.

A high point of rejoicing was the commemoration of the 75th anniversary of the existence of St Casimir Parish on May 18, 1980. The Eucharistic liturgy was concelebrated by Bishop Albert Ottenweller and former pastors. The Mass and dinner which followed were enhanced by the presence of guests who had been associated with St Casimir Church and school. As a memorial of this special event, the parishioners had   compiled an information anniversary book.

From 1980-81, Sister Mary Damien, a member of the Sisters of the Holy Family of Nazareth, Pittsburgh , served the parish as Pastoral Associate. Sister Mira Sokolowski (of the same religious congregation) acted as Director of Religious Education from 1981-1985. In August, 1986, the position of Pastoral Associate was assumed by Sister Jeanne Vucic of the Vincentian Sisters of Charity of Pittsburgh, who continued to minister at St Casimir's at the present time.

After Father Baudo's reassignment, Father Robert Borer filled in as Parish Administrator for a 3-month period until the present pastor, Msgr. John Kolesar, arrived on May 30th, 1985. He hired Sister Lucille Mary Rachan, of the Dominican sisters of Akron, as principal of the school. During her 3 years in this position, St Casimir's reassumed the status of a "parish" school. However, in 1992, the decision to close the school due to lack of funds and small enrollment, was regretfully made. The building continues to be used for parish Religious Education classes and for the community's ecumenical Vacation Bible School. Since January, 1995, the building has also been used by the Jefferson County Community Action Coucil for their Head Start program.

At present, the parish plant includes the church, school, rectory, festival field with kitchen and pavilions, and a parish cemetery. For 58 years, the St Casimir Summer Festival was the parish's major fund-raiser, attracting entertainers as well-known as Bobby Vinton, BJ Thomas, and a host of lesser-known performers. In June of 1990, as festival prepartations were in progress, our area was hit with torrential rains resulting in a major flood in this part of the Ohio Valley. Since the church grounds were not adversely affected, our facilities enabled us to provide meals for those who were helping to clean up the aftermath of the flood. A modified festival was held the following weekend, giving people the opportunity to relax and enjoy the supportive fellowship of their local community.

Parish organizations which are currently active include the Parish Pastoral Council, Catholic Women's Club, Knights of Columbus, Widows Support Group, Scripture-Sharing Group, and the Rosary Society. Several members come together to form a Parish Choir enhancing liturgical celebrations at Christmas, Easter, and on special occasions. In former years, a good number of parishioners participated in Cursillo and "Christ Renews His Parish." In late 1989, a Parish Directory was put together with photos of members, names and addresses of active members, as well as pictures of the vaious parish organizations and school activities.

A program of Religious education has been developed for students in grades 1-12. Sacramental preparation for First Confession and Eucharist, as well as Confirmation incorporates family-sponsor involvement. Adult Religious formation includes Lenten Scripture-sharing groups, as well as an ongoing Faith enrichment group, which meets to study and pray Scripture. Parishioners are also actively involved in many liturgical ministries:altar servers, Eucharistis ministers, lectors, cantors, organists, and ministers to the sick.

Unfortunatley, the mining industry, which orignally drew many people to this area, has all but exhausted its local resources. As a result, many young families have been forced to move from town, in order to seek employment elsewhere. This has caused a decrease in the population of the community and parish. As we approach the 21st century, the people of Adena hope for an economic revival, which would encourage the return of the industries and young families to again enjoy this protion fo the Ohio Valley and spiritual benefits of the Catholic Church in the Diocese of Steubenville.