Google #Agora and your usual result will be a plan of the Agora at Athens at any stage from the Archaic to the Roman era.
However I've hunted up some diagrams and maps of the agora area of other cities for your use.
Note the common characteristics :
An open near a shrine or temple or public buildings used both for markets and gatherings.
It does not always have palaces nearby nor do the main roads or streets lead straight away into it.
Large public buildings like stoas or basilicas or courtrooms are often later additions.
Even the smallest polises seem to be have had one.
Now for some images:
The Agora of THASOS
and a map of the city to show its relation to other areas
Sometime next week Corinth !
This weekend we return to the Gospel of Matthew !