Japan Population Decline by 2050

Japan's total population is projected to fall from 126 million (2020) to around 104 million by 2050 — a 17% drop. But the national average masks enormous regional variance: some rural municipalities are projected to lose more than 70% of their residents, while a handful of Tokyo wards and suburbs continue to grow.

Where the decline is steepest

The fastest-shrinking municipalities are typically small mountain villages in Gunma, Nara, Shimane, and Kōchi prefectures. Towns such as Nanmoku (Gunma) and Nosegawa (Nara) are projected to lose over 70% of their population by 2050. These communities already have median ages above 65 and very few working-age residents, which makes natural replacement mathematically impossible.

Why rural Japan is shrinking faster than the national average

Three forces compound: low fertility (national TFR ~1.2), internal migration of young adults toward Tokyo, Osaka, and Fukuoka, and the fact that existing rural populations are already heavily skewed older. Even if fertility were to rebound tomorrow, the cohort structure guarantees continued decline for decades.

Policy responses and what to watch

The Japanese government's regional revitalization (地方創生) program, relocation subsidies, satellite-office tax breaks, and remote-work adoption post-COVID have slowed but not reversed the trend. Researchers often watch Tokushima's Kamiyama and Hokkaidō's Higashikawa as counter-examples where targeted policy produced measurable in-migration.

Top 50 municipalities by projected decline (2020 → 2050)

Rank	Municipality	Pop. (2025)	Change 2020–2050
1	Gunma Nanmoku	1,260	▼ -74.8%
2	Kumamoto Kuma	2,263	▼ -73.3%
3	Nara Nosegawa	289	▼ -72.5%
4	Hokkaido Utashinai	2,448	▼ -72.0%
5	Nara Mitsue	1,225	▼ -71.5%
6	Nara Soni	1,142	▼ -70.8%
7	Hokkaido Yuubari	5,610	▼ -70.6%
8	Nara Kurotaki	515	▼ -70.6%
9	Nara Higashiyoshino	1,281	▼ -70.6%
10	Aomori Imabetsu	1,888	▼ -70.4%
11	Gunma Kanna	1,317	▼ -69.7%
12	Nagano Tenryuu	965	▼ -69.1%
13	Hokkaido Matsumae	5,260	▼ -69.0%
14	Mie Minamiise	9,206	▼ -68.8%
15	Kochi Ootoyo	2,762	▼ -68.8%
16	Nara Yoshino	5,221	▼ -68.7%
17	Hokkaido Kamisunagawa	2,319	▼ -68.5%
18	Kyoto Kasagi	953	▼ -67.9%
19	Kochi Muroto	9,634	▼ -67.8%
20	Oita Himeshima	1,503	▼ -67.7%
21	Aomori Sotogahama	4,510	▼ -67.6%
22	Hokkaido Kikonai	3,255	▼ -66.2%
23	Aomori Sai	1,467	▼ -66.1%
24	Hokkaido Fukushima	3,182	▼ -65.9%
25	Gunma Shimonita	5,492	▼ -65.5%
26	Nara Shimoichi	4,110	▼ -65.5%
27	Aomori Fukaura	6,259	▼ -65.3%
28	Tokushima Naka	6,273	▼ -65.0%
29	Yamanashi Minobu	8,910	▼ -64.6%
30	Hokkaido Ashibetsu	10,581	▼ -64.2%
31	Nara Kamikitayama	375	▼ -64.0%
32	Fukushima Mishima	1,215	▼ -63.6%
33	Aomori Nakadomari	8,154	▼ -63.4%
34	Hokkaido Moseushi	2,332	▼ -63.3%
35	Akita Fujisato	2,526	▼ -63.3%
36	Akita Kamikoani	1,703	▼ -63.2%
37	Tokushima Mugi	3,125	▼ -63.1%
38	Hokkaido Kamoenai	802	▼ -62.6%
39	Hokkaido Akabira	8,261	▼ -62.4%
40	Akita Oga	21,566	▼ -62.4%
41	Kyoto Wazuka	2,968	▼ -62.4%
42	Nara Kawakami	969	▼ -62.4%
43	Kochi Niyodogawa	4,010	▼ -62.3%
44	Iwate Nishiwaga	4,355	▼ -62.2%
45	Hokkaido Kaminokuni	3,656	▼ -61.9%
46	Aomori Shingou	1,849	▼ -61.9%
47	Tottori Wakasa	2,338	▼ -61.9%
48	Hokkaido Otobe	2,937	▼ -61.8%
49	Hokkaido Kamikawa	3,165	▼ -61.8%
50	Niigata Aga	8,338	▼ -61.8%

Explore by prefecture

Source: National Institute of Population and Social Security Research (IPSS), "Regional Population Projections for Japan (2023 revision)", and Japan's Statistics Bureau (e-Stat) national census data.