Members of St. Mark's Church have a long history of involvement in outreach projects collectively and individually.

Our primary project is FaithWorks, the Annual Appeal of the Diocese of Toronto that raises funds for the delivery of direct, practical assistance to those in need or at risk. In 2004 St. Mark's was honoured to receive the Most Generous Parish Award for the Trent-Durham area, and continues to be recognised as a lead parish in the campaign each year. FaithWorks funds directed to parish outreach projects go to Access Community Centre, Community Care, Fare Share, Northumberland Services for Women, the Canadian Bible Society, and Alpha House.

Each week non-perishable food donations are collected for Fare Share, a local food bank, and a small basket containing one or two items, representative of these, is presented at the altar each Sunday.

St. Mark's provides funds to the Port Hope Benevolent Society, which enables clerics in Port Hope churches to provide food vouchers to people in emergency situations.

At Christmas parishioners fill shoeboxes with gifts for distribution to youth in disadvantaged areas of the world, and assist with food baskets more locally.

St. Mark's supports the Salvation Army’s “Soupertime” lunches, which provide an affordable lunch to approximately 40 people each Tuesday through the fall, winter and spring. The lunches are prepared and served in the Parish Hall.

St. Mark's is represented on the board of “ Maples Court ” which provides affordable housing for seniors.

The Church also provides space in its Parish Hall for meetings of AA and Scouts Canada.