Koshu (甲州市)

City

Yamanashi (山梨) — 2025 — Based on Basic Resident Register

Total Population

29,079

-521 (-1.76%)

Young (0–14)

9.5%

2,753

Working Age (15–64)

52.4%

15,231

Aging Rate

38.2%

11,095

Population Trends (2006–2025)

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

Category	Total	Male	Female
Total	29,079	14,081	14,998
Young (0–14)	2,753	1,395	1,358
Working Age (15–64)	15,231	7,813	7,418
Elderly (65+)	11,095	4,873	6,222

Year	Total Population	0–14	15–64	65+	Aging Rate
2025	29,079	2,753	15,231	11,095	38.2%
2024	29,600	2,860	15,621	11,119	37.6%
2023	29,925	2,953	15,888	11,084	37.0%
2022	30,447	3,042	16,294	11,111	36.5%
2021	30,770	3,112	16,602	11,056	35.9%
2020	31,235	3,220	17,031	10,984	35.2%
2019	31,784	3,350	17,455	10,979	34.5%
2018	32,384	3,552	17,914	10,918	33.7%
2017	32,886	3,684	18,316	10,886	33.1%
2016	33,306	3,847	18,712	10,747	32.3%
2015	33,731	3,984	19,160	10,587	31.4%
2014	34,182	4,138	19,710	10,334	30.2%
2013	34,513	4,238	20,051	10,224	29.6%
2012	34,876	4,395	20,415	10,066	28.9%
2011	35,168	4,457	20,700	10,011	28.5%
2010	35,619	4,609	20,920	10,090	28.3%
2009	36,002	4,778	21,152	10,072	28.0%
2008	36,387	4,899	21,563	9,925	27.3%
2007	36,700	5,005	21,932	9,763	26.6%
2006	37,132	5,156	22,322	9,654	26.0%