Seiyo (西予市)

City

Ehime (愛媛) — 2025 — Based on Basic Resident Register

Total Population

33,721

-817 (-2.37%)

Young (0–14)

9.1%

3,055

Working Age (15–64)

46.5%

15,665

Aging Rate

44.5%

15,001

Population Trends (2005–2025)

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

Category	Total	Male	Female
Total	33,721	16,031	17,690
Young (0–14)	3,055	1,546	1,509
Working Age (15–64)	15,665	8,089	7,576
Elderly (65+)	15,001	6,396	8,605

Year	Total Population	0–14	15–64	65+	Aging Rate
2025	33,721	3,055	15,665	15,001	44.5%
2024	34,538	3,217	16,085	15,236	44.1%
2023	35,232	3,374	16,402	15,456	43.9%
2022	35,876	3,491	16,695	15,690	43.7%
2021	36,633	3,595	17,215	15,823	43.2%
2020	37,248	3,715	17,664	15,869	42.6%
2019	38,019	3,845	18,141	16,033	42.2%
2018	38,947	4,010	18,760	16,177	41.5%
2017	39,767	4,113	19,406	16,248	40.9%
2016	40,426	4,201	20,054	16,171	40.0%
2015	41,119	4,304	20,729	16,086	39.1%
2014	41,809	4,404	21,460	15,945	38.1%
2013	42,051	4,420	21,889	15,742	37.4%
2012	42,371	4,556	22,273	15,542	36.7%
2011	42,937	4,687	22,749	15,501	36.1%
2010	43,586	4,815	23,082	15,689	36.0%
2009	44,127	4,925	23,533	15,669	35.5%
2008	44,738	5,072	24,006	15,660	35.0%
2007	45,364	5,217	24,512	15,635	34.5%
2006	45,980	5,322	25,123	15,535	33.8%
2005	46,499	5,485	25,494	15,520	33.4%