Paeonia was located to the north of Macedon, south of Dardania, west of Thrace, and east of the southernmost Illyrians.
Classical sources usually considered the Paeonians distinct from the rest of the Paleo-Balkan people, comprising their own ethnicity and language.
It is considered a Paleo-Balkan language but this is only a geographical grouping, not a genealogical one.
Modern linguists are uncertain as to the classification of Paeonian, due to the extreme scarcity of surviving materials in the language, with numerous hypotheses having been published: Several Paeonian words are known from classical sources: A number of anthroponyms (some known only from Paeonian coinage) are attested: Agis (Άγις), Patraos (Πατράος), Lycpeios (Λύκπειος), Audoleon (Αυδολέων), Eupolemos (Εὐπόλεμος), Ariston (Αρίστων), etc.
In addition several toponyms (Bylazora (Βυλαζώρα), Astibos (Άστιβος) and a few theonyms Dryalus (Δρύαλος), Dyalos (Δύαλος), the Paeonian Dionysus, as well as the following: