Otsuki (大月町)

Town

Kochi (高知) — 2025 — Based on Basic Resident Register

Total Population

4,348

-129 (-2.88%)

Young (0–14)

6.0%

261

Working Age (15–64)

42.0%

1,824

Aging Rate

50.8%

2,207

Population Trends (1995–2025)

* Data before 2012 includes Japanese residents only (foreign residents were added to the Basic Resident Register in July 2012)

Category	Total	Male	Female
Total	4,348	2,142	2,206
Young (0–14)	261	132	129
Working Age (15–64)	1,824	969	855
Elderly (65+)	2,207	992	1,215

Year	Total Population	0–14	15–64	65+	Aging Rate
2025	4,348	261	1,824	2,207	50.8%
2024	4,477	276	1,918	2,233	49.9%
2023	4,582	298	1,991	2,257	49.3%
2022	4,712	311	2,098	2,290	48.6%
2021	4,805	320	2,168	2,298	47.8%
2020	4,939	350	2,261	2,307	46.7%
2019	5,058	370	2,358	2,313	45.7%
2018	5,217	402	2,462	2,341	44.9%
2017	5,377	438	2,565	2,363	43.9%
2016	5,527	464	2,691	2,362	42.7%
2015	5,689	492	2,817	2,369	41.6%
2014	5,781	501	2,911	2,358	40.8%
2013	5,911	525	3,041	2,334	39.5%
2012	6,001	543	3,139	2,319	38.6%
2011	6,153	571	3,259	2,323	37.8%
2010	6,304	612	3,307	2,385	37.8%
2009	6,389	632	3,374	2,383	37.3%
2008	6,516	666	3,458	2,392	36.7%
2007	6,697	698	3,609	2,390	35.7%
2006	6,843	723	3,733	2,387	34.9%
2005	6,962	744	3,832	2,386	34.3%
2004	7,095	785	3,931	2,379	33.5%
2003	7,196	813	4,013	2,370	32.9%
2002	7,260	836	4,076	2,348	32.3%
2001	7,346	887	4,128	2,331	31.7%
2000	7,415	915	4,189	2,311	31.2%
1999	7,503	949	4,269	2,285	30.5%
1998	7,625	1,022	4,350	2,253	29.5%
1997	7,695	1,056	4,462	2,177	28.3%
1996	7,868	1,115	4,592	2,161	27.5%
1995	7,922	1,146	4,684	2,092	26.4%