The area covered in this page is the southern half of the I Regio Augustea, Latium et Campania. The northern half is in the page Latium. The region Campania begins south of the river Liri with the land formerly inhabited by the Aurunci, then the Campania proprie dicta from the river Volturno to the river Sarno, and the country of the Alfaterni later inhabited by the Piceni, up to the river Sele. In the inner part, it includes the land of the Samnites Pentri and of the Sidicini. Also included are the islands of the Tyrrhenian sea. For the rest of the Samnites, see under Samnium and Hirpinia.
Common remarks: the place-names have been put in the nominative case, an asterisk * means not attested, reconstructed form. The late place-names of probable Latin origin have not been included. The IE roots are in the form given by Pokorny's Indogermanische Wörterbuch. The links will be active when the single pages will be published, see the main page. For any comment, suggestion, email me.
Vice versa, the coastal area shows influences of harder interpretation. Likely, a Western Italic stratum and a Liguro-Sicanian stratum (maybe Opican the first, Auruncan or Ausonian the second) left some toponymy. But the majority of the place names is of dobious intepretation.
Of course, many are the names of Greek origin, since the area of Cumae, Neaples and the islands were inhabited by Greek settlers.