Sanmen County population
Sanmen County is a county-level area in Zhejiang Province, China. Resident population was 389,000 people in 2025, with a density of 348.0 people per km². Explore historical, census and economic data.
Population structure · 2025
Latest-year age structure, births, deaths, city population and ethnic population.
Data basis / note：户籍
Population over time
Resident population and urbanization, 1978 to 2025.
Historical indicators
Selected years from our annual dataset.
| Value | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Resident population | 380,000 people | 379,000 people | 379,000 people | 387,000 people | 388,000 people | 389,000 people |
| Urbanization rate | — | — | 55.7% | 57.1% | 59.0% | 59.8% |
| Birth rate | 8.12 ‰ | 6.19 ‰ | 5.27 ‰ | 4.82 ‰ | 5.05 ‰ | 4.53 ‰ |
| Death rate | 5.51 ‰ | 5.75 ‰ | 5.83 ‰ | 6.81 ‰ | 5.84 ‰ | 5.79 ‰ |
| GDP | — | — | — | — | — | — |
Census data
Population, households, age structure and ethnic composition from modern censuses.
Ethnic composition
Population by ethnic group in the most recent census.
Economy and income
Gross domestic product, growth and household disposable income.
Economy and income
- GDP
- $5.5B2025
- GDP growth
- 4.5%
- Primary industry
- $627.8M
- Secondary industry
- $2.5B
- Tertiary industry
- $2.3B
- Urban disposable income
- $9,024
- Rural disposable income
- $5,405
Townships and subdistricts
Population of townships, towns and subdistricts from the latest census.
| Township / subdistrict | Population | Male | Female |
|---|---|---|---|
| Haiyou (海游街道) | 120,367 | 61,628 | 58,739 |
| Pubagang (浦坝港镇) | 87,025 | 44,557 | 42,468 |
| Jiantiao (健跳镇) | 47,529 | 24,335 | 23,194 |
| Tingpang (亭旁镇) | 30,369 | 15,549 | 14,820 |
| Zhuao (珠岙镇) | 29,828 | 15,272 | 14,556 |
| Hairun (海润街道) | 25,693 | 13,155 | 12,538 |
Frequently asked questions
What is the population of Sanmen County?
The resident population of Sanmen County was 389,000 people in 2025. This figure refers to people living in the area for more than six months, unless the source states otherwise.
How densely populated is Sanmen County?
The population density is 348.0 people per square kilometre, based on a land area of 1,118 km².
Where does this data come from?
Figures are compiled from national statistical yearbooks, census publications and official regional statistics. Each table displays its reference year. Read the data sources page for details.
Nearby areas
- JiaojiangCounty-level area
- HuangyanCounty-level area
- LuqiaoCounty-level area
- TiantaiCounty-level area
- XianjuCounty-level area
- WenlingCounty-level area
- LinhaiCounty-level area
- YuhuanCounty-level area
Compare Sanmen County
Put this region side by side with another area.
Data source: 2025年三门县国民经济和社会发展统计公报 · Methodology and sources: Data sources