Saiwai Ward’s population reaches 177,221, up 0.87% in a year, the fastest growth in Kawasaki: households and population as of Oct 1, 2026

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As of Oct 1, 2026, Saiwai Ward had 177,221 residents in 85,685 households. Compared with the previous month, the population rose by 142 and households by 106.

Saiwai’s population grew 0.87% from a year earlier, the highest growth rate of Kawasaki’s seven wards.

Kawasaki City’s total population was 1,565,872, down 99 from the previous month but up 6,301 (0.40%) from a year earlier.

Households and population as of Oct 1

On Oct 13, 2026, Kawasaki City released its household and population figures as of Oct 1, 2026. These monthly figures are estimates based on the national census, adjusted for later changes in the resident register.

From this release, figures from Oct 1, 2025 onward have been revised to use the detailed results of the 2025 national census.

Saiwai: 177,221 people, 85,685 households

	As of Oct 1, 2026	From the previous month
Population	177,221	up 142
Households	85,685	up 106

The population is made up of 89,309 men and 87,912 women. The population density is 17,704 people per square kilometer, the second highest in the city after Nakahara Ward (18,407).

During September, Saiwai had 117 births and 147 deaths, a natural decrease of 30. Meanwhile, 904 people moved in and 732 moved out, an increase of 172. Overall, the population rose by 142.

Saiwai grew fastest of the 7 wards this year

Saiwai’s population grew 0.87% from a year earlier, the highest rate, followed by Tama (0.81%) and Nakahara (0.65%). Miyamae and Asao saw decreases.

Compared with the previous month, the population rose in four wards: Saiwai, Nakahara, Takatsu and Miyamae. Saiwai’s increase of 142 was the largest of the seven wards. Kawasaki, Tama and Asao wards declined.

The city overall: 1,565,872 people

The city’s total population was 1,565,872 (787,211 men and 778,661 women), in 788,160 households. Compared with the previous month, the population fell by 99 while households rose by 448.

In September, deaths outnumbered births by 219, while moves in and out added 120 people. Compared with the same time a year earlier, the population was up 6,301 (0.40%).

Contacts

Contact the Statistical Information Division, Urban Policy Department, General Affairs and Planning Bureau, Kawasaki City (phone 044-200-2067). The city says figures for each ward office and branch office will be added retroactively after the census results for small areas are released.