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.......
Amen!