Some interesting scriptures
“To all those in Rome”, note Rome is a city
“To the churches of Galatia”, note Galatia is a province
“To the church of God that is in Corinth”, note Corinth is a city
“To the saints who are in Ephesus”, note Ephesus is a city
“To all the saints in Christ Jesus who are at Philippi”, note Philippi is a city
“To the saints and faithful brothers in Christ at Colossae”, note Colossae is a city
“To the church of the Thessalonians” , note Thessalonica is a city
How many churches did Paul see in a city? – ONE
Forget about buildings, churches are not buildings
Therefore if there were Elders, they were elders of the city.
There was not one man overseeing the church of the city
The word “Pastor” is an interesting one, i think it only occurs once in the New Testament.
The word “Pastor” interchanges with shepherd which interchanges with overseer which interchanges with elder. They are all the same word. If you want a scriptural explanation try to find a teaching by Derek Prince called “The Chief Shepherd and his undershepherds”