As early as 1916 through the 1940's, occasional Episcopal services were held in the homes of a few families in Marshfield coducted by various ministers. This was the start of the Trinity Mission. Sometimes the homes were quite crowded, especially after Arch-Deacon Herbert Johnson of New Bedford became a regular officiant. He recognized that there was enough serious interest among the Marshfield faithful to re-establish a parish church in Marshfield after three earlier failed attempts.

Earlier in the 1860-1870's, the Town of Marshfield had built ten, one-room schoolhouses for use as elementary schools. As larger public schools eplaced these decommissioned one-room schools, the Town sold them. One district schoolhouse, located on Summer Street in Sea View, was purchased for $375 by the Women's Guild of Trinity Mission for use in worship services in the Trinity Mission was offered the abandoned old North Baptist Church property on Highland Street by its then-current owner, the North Community Church of Marshfield Hills.

After $16,000 in maintenance expenditures, the circa 1833 North Baptist Church building on Highland Street was adopted by Trinity Mission, leaving the ex-schoolhouse behind. Shortly thereafter, the Trinity congregation decided to move their Sea View school building to a site just behind the churhc building on Highland street. the schoolhouse would become the parish hall. They named the building Johnson Hall after Arch Deacon Herbert Johnson, the person guided the congreagation from mission to parish.