Not everyone lives in a neighborhood or feels an affinity with neighbors. Often, people identify more with their workplace, either with people working for the same enterprise or people working in the same area.
For example, church members who work for the same company could form a small group with other colleagues and meet in the employee cafeteria or in a conference room.
Or church members who work in, say, an office building with multiple companies could form a small group with people in the same building.
As more and more people form small one-person ventures, such as consulting firms, that can find Christian fellowship with others working nearby and, at the same time, deal with professional isolation.
It is important that the group exist for its own sake and not be perceived as "prospecting" for new church members. It is likely that workplace groups will stir an interest in knowing more about your church. But that should flow naturally and not be an overt agenda.