Allentown's area is 46.64 sq km (about ~18 sq miles), while Raccoon's area is roughly 72 sq km (~28 square miles). Population of Allentown is averaging at ~140k in the city itself, while Raccoon's estimated city populace during the "pre-outbreak" period was around 300~320k (accounting for permanently settled citizens and not including Stoneville's metrics).

The skyline of Pittsburgh is literally "Raccoon City" how Mikami himself initially envisioned it in his head in the 90's, directly. Some of the topology and infrastructure also matched his personal vision of it.

Allentown, Fogelsville, and Pittsburgh, are all in Pennsylvania.
Raccoon City is also in Pennsylvania by official established canon lore and available info.

ditto: