Kochi (高知)

Shikoku (四国)

2024 — Population estimate as of Oct 1

Total Population

656,000

-10,000 (-1.50%)

National #45

Young (0–14)

10.2%

67,000 · National avg. 11.2%

Working Age (15–64)

53.0%

348,000

Aging Rate

36.6%

240,000 · National avg. 29.3% · National #2

Age Composition (vs National)

Population Trends (1920–2024)

Breakdown by Sex (2024)

Category	Total	Male	Female
Total	656,000	311,000	345,000
Young (0–14)	67,000	34,000	33,000
Working Age (15–64)	348,000	175,000	173,000
Elderly (65+)	240,000	101,000	139,000

Municipal Population (2025)

34 results

#	Municipality	Total Population	Change	0–14	15–64	Aging Rate
1	Kochi (高知市) Core City	312,228	-1.32%	11.1%	57.8%	31.2%
2	Nankoku (南国市) City	45,979	-0.33%	11.9%	56.3%	31.7%
3	Konan (香南市) City	32,585	-0.96%	11.8%	55.7%	32.5%
4	Shimanto (四万十市) City	31,424	-1.60%	10.6%	51.5%	37.8%
5	Tosa (土佐市) City	25,646	-1.27%	10.9%	52.0%	37.1%
6	Kami (香美市) City	24,667	-1.33%	9.9%	50.6%	39.5%
7	Ino (いの町) Town	20,829	-1.67%	9.5%	48.8%	41.4%
8	Susaki (須崎市) City	19,325	-2.54%	8.2%	50.1%	41.7%
9	Sukumo (宿毛市) City	18,394	-2.52%	9.3%	49.9%	40.8%
10	Aki (安芸市) City	15,555	-2.17%	8.0%	49.5%	42.5%
11	Shimantocho (四万十町) Town	14,945	-2.94%	8.8%	45.1%	46.1%
12	Sakawa (佐川町) Town	11,805	-1.73%	9.7%	48.8%	41.4%
13	Tosashimizu (土佐清水市) City	11,591	-3.00%	5.9%	42.0%	52.1%
14	Muroto (室戸市) City	11,273	-3.41%	5.8%	41.9%	52.3%
15	Kuroshio (黒潮町) Town	9,855	-2.51%	8.1%	44.7%	47.2%
16	Nakatosa (中土佐町) Town	5,774	-2.81%	6.9%	43.1%	50.0%
17	Tsuno (津野町) Town	5,184	-2.67%	9.1%	43.8%	46.5%
18	Ochi (越知町) Town	4,811	-2.59%	7.5%	43.5%	48.5%
19	Hidaka (日高村) Village	4,704	-2.14%	9.5%	46.9%	42.9%
20	Niyodogawa (仁淀川町) Town	4,459	-4.21%	6.5%	36.5%	55.8%
21	Otsuki (大月町) Town	4,348	-2.88%	6.0%	42.0%	50.8%
22	Geisei (芸西村) Village	3,570	-0.08%	10.3%	52.3%	37.4%
23	Tosacho (土佐町) Town	3,488	-0.97%	9.3%	43.7%	45.7%
24	Motoyama (本山町) Town	3,125	-2.53%	7.7%	44.3%	46.8%
25	Yusuhara (梼原町) Town	3,084	-2.87%	8.9%	42.5%	47.9%
26	Otoyo (大豊町) Town	2,961	-4.33%	5.5%	33.8%	60.7%
27	Nahari (奈半利町) Town	2,858	-2.19%	7.7%	43.6%	47.4%
28	Tano (田野町) Town	2,419	-2.14%	10.0%	47.8%	41.5%
29	Yasuda (安田町) Town	2,269	-3.24%	7.9%	43.7%	47.6%
30	Toyo (東洋町) Town	2,059	-2.79%	5.5%	40.4%	53.3%
31	Mihara (三原村) Village	1,355	-4.24%	6.9%	43.5%	48.5%
32	Kitagawa (北川村) Village	1,177	-2.16%	6.8%	46.9%	44.5%
33	Umaji (馬路村) Village	762	-4.63%	8.8%	49.0%	40.8%
34	Okawa (大川村) Village	355	+0.00%	12.4%	44.2%	41.1%

Annual Trends

Year	Total Population	0–14	15–64	65+	Aging Rate
2024	656,000	67,000	348,000	240,000	36.6%
2023	666,000	70,000	355,000	242,000	36.3%
2022	676,000	72,000	360,000	244,000	36.1%
2021	684,000	74,000	365,000	245,000	35.8%
2020	691,527	75,171	370,997	245,359	35.5%
2015	728,276	83,986	405,440	238,850	32.8%
2010	764,456	92,798	447,540	218,148	28.5%
2005	796,292	102,421	487,367	206,375	25.9%
2000	813,949	111,740	509,050	191,729	23.6%
1995	816,704	125,833	522,208	167,967	20.6%
1990	825,034	144,276	535,995	141,508	17.2%
1985	839,784	168,580	548,167	121,759	14.5%
1980	831,275	173,649	547,780	109,116	13.1%
1975	808,397	173,005	536,129	98,752	12.2%
1970	786,882	171,991	524,918	89,973	11.4%
1965	812,714	200,055	530,837	81,822	10.1%
1960	854,595	253,081	528,882	72,632	8.5%
1955	882,683	283,714	532,592	66,367	7.5%
1950	873,874	290,081	525,678	58,073	6.6%
1945	775,578	264,022	454,662	56,894	7.3%
1940	709,108	242,139	412,484	54,485	7.7%
1935	714,980	253,450	410,273	51,257	7.2%
1930	718,152	251,693	417,501	48,958	6.8%
1925	687,478	241,108	397,694	48,676	7.1%
1920	670,895	229,568	394,419	46,908	7.0%