Japan Population Decline Simulator

Kanagawa神奈川県

Saiwai 川崎市幸区

Data last updated:

Saiwai, Kanagawa, Japan has a population of 171,188 (2020 national census). IPSS projections estimate 175,612 by 2030 and 185,125 by 2050 (an increase of about 8.1% from 2020), with the share of residents aged 65+ rising from 21.7% to 27.9%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)

2020

(Census)

171,188

2030

(Projection)

175,612

▲ +2.6%

2040

(Projection)

182,689

▲ +6.7%

2050

(Projection)

185,125

▲ +8.1%

Elderly Rate (65+): 2020 21.7%→2050 27.9%

Other municipalities in Kanagawa (神奈川県)

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View all municipalities in Kanagawa (神奈川県) →

Data Sources

  • Portal Site of Official Statistics of Japan (e-Stat)（https://www.e-stat.go.jp/）
  • National Institute of Population and Social Security Research (IPSS), Regional Population Projections (2023 ed.)

* This service uses the e-Stat API but its content is not guaranteed by the Japanese government.

Saiwai Population Projection Table (2020–2050)

Population by year, based on the national census and IPSS (2023) projections.

YearPopulationvs 2020Type
2020171,188—Census
2025170,571▼ -0.4%Projection
2030175,612▲ +2.6%Projection
2035179,722▲ +5.0%Projection
2040182,689▲ +6.7%Projection
2045184,404▲ +7.7%Projection
2050185,125▲ +8.1%Projection

About Saiwai

Overview

Saiwai (川崎市幸区) is a municipality in Kanagawa, Japan, with a population of 171,188 as of 2020.

Population Projection of Saiwai

According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Saiwai's population is expected to reach 175,612 by 2030 (+2.6%), 182,689 by 2040 (+6.7%), and 185,125 by 2050 (+8.1%). Saiwai is among the rare Japanese municipalities projected to see population growth.

Aging Rate of Saiwai

The aging rate (percentage of residents aged 65 and over) is 21.7% as of 2020 and is projected to rise to 27.9% by 2050. The aging rate will remain below the most severe Japanese averages.

National Comparison

Saiwai's demographic trajectory is similar to the national average.

National and Prefectural Rank

  • Population decline rate: Ranked #1887 out of 1916 municipalities nationwide.
  • Aging rate in 2050: Ranked #1868 out of 1916 nationwide.
  • Population size: Ranked #222 out of 1916 nationwide.
  • Related: National rankings / All municipalities in Kanagawa

Frequently Asked Questions

Q.What is the current population of Saiwai, Kanagawa?
A.According to the 2020 national census, Saiwai has a population of 171,188.
Q.What is the population of Saiwai in 2026?
A.Saiwai's population in 2026 is estimated at approximately 171,579. This is an interpolated reference value between the 2020 census (171,188) and the IPSS projection for 2030 (175,612).
Q.What is the projected population of Saiwai in the future?
A.According to IPSS projections, Saiwai's population is expected to be 175,612 in 2030, 182,689 in 2040, and 185,125 in 2050.
Q.What is the population decline rate of Saiwai?
A.Over the 30 years from 2020 to 2050, Saiwai's population is projected to change by +8.1%. The 10-year change is +2.6% and the 20-year change is +6.7%.
Q.Why is the population of Saiwai growing?
A.Municipalities with growing populations typically benefit from net in-migration driven by good access to major metropolitan areas, housing development, and family support policies. Saiwai is one of the minority of Japanese municipalities projected to grow through 2050.
Q.What is the aging rate of Saiwai?
A.Saiwai's aging rate (percentage aged 65 and over) is 21.7% as of 2020, projected to rise to 27.9% by 2050.
Q.Where does this population data come from?
A.Historical data is sourced from Japan's national census via the e-Stat API (Statistics Bureau of Japan). Future projections are from the National Institute of Population and Social Security Research (IPSS) "Regional Population Projections 2023".
Q.Is the data up to date?
A.Historical data uses the 2020 national census results. Future projections use the IPSS 2023 edition. Data will be updated as new census results become available.

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View all 61 municipalities in Kanagawa →

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