The population denseness ground (total 127,619,000)
Best 1;

Tokyo 12,310,000 (Kanto area)
Osaka 8,816,000
Kanagawa 8,687,000 (Kanto area)
Aichi 7,158,000
Saitama 7,029,000 (Kanto area)
Best 2;

Chiba 6,024,000 (Kanto area)
Hokkaido 5,659,000
Hyogo 5,585,000
Fukuoka 5,051,000
Shizuoka 3,793,000 (Kanto area)
   Worst 1;

Tottori 611,000
Shimane 753,000
Kouchi 807,000
Tokushima 817,000
Fukui 827,000
Worst 2;

Saga 872,000
Yamanashi 887,000
Kagawa 1,020,000
Wakayama 1,058,000
Toyama 1,117,000
The Kanto area is 50,441,000 (40%).