Not true.
Every county was slated to have a seat. Three town sites were planned by Samuel Holland.
- The county seat of Queens County was Charlottetown (now provincial capital and the provinces largest city).
- The county seat of Kings County was Georgetown (on Cardigan Bay, close to Montague). Montague became the de facto county shire because it was better connected to the road network. Georgetown is an interesting place with a classical grid style street network and a few amenities like the county court house and a live theatre, but only has a population of 555.
- The county seat of Prince County was (intended to be) Princetown, situated on the northeastern edge of Malpeque Bay. It suffered from relative isolation like Georgetown, but to such an extent that it is a "failed town", and essentially no one lives there. The shire town of Prince County became Summerside, PEI's second city.
On the map above, all three intended shire towns are highlighted in orange.