My source for the information is this site. According to it 168 cities had victories throughout the period of the ancient Olympics. Through Google managed to find the location of 162. The six missing appear on these lines.
| Year | Event | City | Victor |
|---|---|---|---|
| 472 BC | Boys' Boxing | Orestheia | Tellon |
| 228 BC | Boys' Stadion | Thelphoussa | Emaution |
| 220 BC | Event Unknown | Nibis | name unknown |
| 120 BC | Boxing | Tritia | Agesarchos |
| 72 BC | Boys' Stadion | Asia | Sosigenes |
| 12 BC | Stadion | Aiolia | Diophanes |
"Ορέσθια" is the modern "Ορεστιάδα". Just search Orestiada.
"Θέλπουσα" is a nymphae daughter of the river "Λάδωνας". It's location is around the modern city "Τρόπαια". Search for Tropaia.
Nibis is "Νουβία". It's a territory by the Nile from South Egypt to North Sudan. It's between Assuan and Hartum. It's approximately modern Ethiopia, but I can't help you more than that here.
Tritia is "Τριταία". It has the same name since 1927. So search for Tritaia.
Now for the difficult part. Asia is "Ασία" which is Asia. Now it's a huge assumption that I would do with no sources at all. So don't be at all sure about that. The other events that year took place at "Μίλητος" or Miletus which is part of Minor Asia as Greeks called it. So I'm purely guessing that it's in the same place.
Aiolia is "Αιολίδα" or "Αιολία" ancient Αιολίς. It's at the northwest Minor Asia. It was a big territory from "Τρωάδα" until "Έρμο" river. It's not perfectly clear where exactly was the events if you need more specific location. It's quite big territory that includes some islands also. (Λέσβος και Τένεδος).
Thanks for the gold and sorry for my poor English. It is obviously not my native language.
Question: do you have a draft version of the map you could share? It's an interesting concept and I'd love to look at it? Just purely out of interest, I'm not able to help you with locating these cities.