According to this answer it appears that each of the districts are in each of Japan's Regions
Tomiko, who lives in Kamisu 66 is the head of the Ethics Committee and she wanted Saki, who also lived in Kamisu 66, to take her place one day.
I am wondering if the Ethics Committee's Tomiko is the head of control of all of Japan, or if each region/district has their own Ethics Committee. If the latter, do they all share the same ruleset (particularly regarding the age a child can be terminated being changed to 17 years)?