Who is it addressed.
The Leader of a Church or The Churches. Because of Geography it is really a Group of Churches meaning One Church (umbrella) as a Whole. Notice the City Churches. The Epistles/Letters Are addressed to Cities.
Romans,Corinthians,Galations,Ephesians,Philipians,Colossians....
Epistle to the Romans First Epistle to the Corinthians
Second Epistle to the Corinthians
Epistle to the Galatians
Epistle to the Ephesians
Epistle to the Philippians
Epistle to the Colossians
First Epistle to the Thessalonians
Second Epistle to the Thessalonians
THEN IT"S TO THE INDIVIDUAL LEADER FOR THE CHURCH
[edit] Pastoral Epistles
The Pastoral Epistles, written by Paul, are addressed to individuals with pastoral oversight of churches and discuss issues of Christian living, doctrine and leadership. They often address different concerns to those of the preceding epistles.
First Epistle to Timothy
Second Epistle to Timothy
Epistle to Titus.......
The idea that the churches would have been run by committees is amusing. We can see the principle of organization in his instruction to the 72 by Jesus in Luke. The House church was the basis of the early church and the head of that house would naturally have been at least the nominal leader. Obviously, some women were very strong in the faith, which lends substance to the feminist claim. But social mores being strong, even a rich widow would have had to have had a “front man” to serve as nominal leader. The letter to Timothy shows pretty clearly how Paul organized his communities. But I think we can safely assume that Luke tells us that even before the Resurrection, the practical foundations for the spread of the Gospel were being laid down. His choosing of the Twelve with Peter as the evident leader and the sending of the disciples is a delegation of authority.