Sigmar's Heirs gives some insight into abour 4 or 5 towns from each province. Some are well known, some aren't.
The ones that are reviewed are Bek, Lieske, Priestlicheim and Talabheim itself. There's no section covering each city state, which is kind of unfortunate. And actually, the first time I even recognized this rather glaring ommission.
There's also a chart that lists the more important places within the province and it lists the size of the settlement, the ruler, population, how wealthy it is, the source of the wealth, garrison and militia numbers and any other interesting notes on the side.
Even though the lists are nice, I highly doubt they are comprehensive as the population totals are so small that it would indicate the complete ruin of some provinces (Hochland) and that even the strongest provinces (Reikland) are doomed to the millions and billions of chaosy demon things that come out of their warp every spring.