The parishes have eight churches that serve a dwindling and aging population, he said. None has a parish elementary school.
The pastors were unavailable for comment Thursday.
"The ultimate question is, what is the future of the Catholic ministry in those areas?" Feuerherd said.
He said diocesan officials hope the parishes will develop recommendations to address the attendance and fiscal problems. Although there is no timeline for reaching a decision, he said, "there is an urgency."
St. Rita's and Emmaus were formed as a result of mergers in 2010, and St. Joachim through a consolidation in 2011. Then-Bishop Joseph Galante closed or merged nearly half of the 124 parishes in the diocese in the hope of creating a smaller but more vibrant Catholic community.
The restructuring met with resistance and anger from some churchgoers. At the time, the merger was the most sweeping consolidation of any Catholic diocese in the United States.
Today, the diocese, which includes Cape May, Atlantic, Cumberland, Salem, Gloucester, and Camden Counties, has 70 parishes and an estimated 500,000 members. Sunday Mass attendance hovers around 23 percent, though the exact size of the membership is difficult to measure. The diocese estimates it is home to 100,000 Catholics relatively recently arrived from Latin America, many of whom do not register with a parish.