Below are all the branches of An Tir organized by Region.
An Tir has two Principalities and three additional administrative regions. In order from South to North, they consist of the following:
- Principality of the Summits (Oregon State South of Portland)
- Rivers Region (Greater Portland Area)
- Inlands Region (Washington State East of the Cascade Mountains)
- Western Region (Washington State West of the Cascade Mountains)
- Principality of Tir Righ (Northern Washington, British Columbia)