France as one price level
Every comparison on this page treats France as a single place, because that is how the price data is published. Eurostat produces purchasing power parities for whole countries, and no official annual series breaks them down by region or city. Paris and a market town in the Massif Central therefore carry the same figure here, although what a new tenant pays for a flat in the two differs several times over. Read a French figure as a national average, and adjust upwards for Paris and the Île-de-France, and to a lesser degree for Lyon, the Côte d'Azur and the Geneva border area.
The overseas departments have price levels of their own, measured separately by the national statistics office and generally higher for food, and a national average says little about any of them.
When the other side of the comparison is a US state, that side does have its own figure, but it is chained rather than measured. Nobody publishes a price level for Ohio in euros. Eurostat publishes one for the United States as a whole, the Bureau of Economic Analysis publishes an index placing each state against the American average, and the state figure is the first scaled by the second. That is the standard construction and it still rests on one assumption more than a comparison between two countries does.
Where French prices tend to sit
France's overall price level is above the European Union average and in the same range as Germany's. The basket is not uniform. Housing and food are the components where France sits highest against Germany, Italy and Spain, while clothing is close to the average. Where the other side is another European country, the breakdown table can show those components separately, because Eurostat publishes a parity for each of them. Where the United States or the United Kingdom is involved, only the whole basket is comparable: Eurostat publishes their headline parity but not the component detail, so the table stops at the total instead of estimating the rest.