2.61 in Yamagata, 2.39 in Iwate
The 2020 census counted 2.61 people per private household in Yamagata and 2.39 in Iwate, rounded to two decimals. The displayed difference is 0.22 people. Both exceed the national average of 2.21. Yamagata had 396,792 private households; Iwate had 490,828.
Private households are not limited to families
The census category includes people living alone in their own dwelling, as well as households with several members. It excludes institutional households. An average of 2.61 combines one-person and larger households rather than describing a typical family.
Iwate counted more households overall, while Yamagata's average household was larger. The number of households and the average number of members answer different questions.
Why households differ needs more data
These averages alone cannot tell us what share of households live alone or include three generations. Answering that requires census tables by household size and family type.