Isojoki: population and statistics
Isojoki has a population of 1,771 (2025) across 642.4 km², or 2.8 people per km². It ranks 266 of 308 municipalities by population. Its population is falling: −16.6% between 2015 and 2025.
- 1,771 residents
- 642.4 km²
- 3 people/km²
- 114 m
Isojoki in numbers
Key points
Among the 18 municipalities in South Ostrobothnia, Isojoki ranks No. 17 by population.
Business establishments per 1,000 inhabitants: 224.6 /1,000 inh. in Isojoki, compared with an average of 138.9 /1,000 inh. in South Ostrobothnia and 106.4 /1,000 inh. nationally.
Largest business sector: Manufacturing, with 21.0% of the area's jobs.
A 1 kWp solar panel tilted at 44° generates about 876 kWh a year here.
Did you know?
- Number 1 in South Ostrobothnia for “Share of residential buildings heated with wood or peat”.
- “Share of residential buildings heated with wood or peat”: higher than in 99% of municipalities.
- “Business establishments per 1,000 inhabitants”: higher than in 98% of municipalities.
- “Share of dwellings not permanently occupied”: higher than in 94% of municipalities.
- Its area is roughly equal to 89,968 football pitches.
- Its population density is 6.6 times lower than the national average.
- The nearest municipality is Karijoki, 25.1 km away.
Population of Isojoki over time
Isojoki had 2,123 residents in 2015 and 1,771 in 2025.
| Year | Population |
|---|---|
| 2020 | 1,925 |
| 2021 | 1,891 |
| 2022 | 1,852 |
| 2023 | 1,814 |
| 2024 | 1,794 |
| 2025 | 1,771 |
All indicators for Isojoki
Value for the municipality, then the regional average and the national median (for counts: regional and national totals). The gauge places the municipality between the lowest and highest value in the country.
Population
| Indicator | Isojoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of people aged under 15 (2025) | 11.1% | 14.9% | 13.3% | ranked 230 of 302 | |
| Share of people aged 65 and over (2025) | 37.1% | 27.7% | 31.2% | ranked 84 of 302 | |
| Mean age of the population (2025) | 52.0 years | 45.7 | 48.5 | ranked 73 of 302 | |
| Share of Swedish speakers (2025) | 0.9% | 0.3% | 0.3% | ranked 66 of 302 | |
| Share of foreign nationals (2025) | 4.3% | 3.9% | 3.4% | ranked 103 of 302 |
Housing
| Indicator | Isojoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Total dwellings (2025) | 1,237 no. | 109,577 no. | 3,258,449 no. | ranked 258 of 308 | |
| Share of dwellings built before 1940 (2025) | 14.7% | – | 8.2% | ranked 45 of 302 | |
| Share of dwellings built after 2000 (2025) | 10.1% | – | 14.5% | ranked 230 of 302 | |
| Share of dwellings in detached and semi-detached houses (2025) | 68.5% | – | 64.5% | ranked 107 of 302 | |
| Share of dwellings in blocks of flats (2025) | 2.6% | – | 11.1% | ranked 257 of 302 | |
| Share of dwellings not permanently occupied (2025) | 26.5% | – | 16.9% | ranked 19 of 302 | |
| Free-time residential buildings per 1,000 inhabitants (2025) | 120.8 /1,000 inh. | 67.9 /1,000 inh. | 186.3 /1,000 inh. | ranked 190 of 302 |
Energy
| Indicator | Isojoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of residential buildings heated with district heating (2025) | 4.7% | – | 3.9% | ranked 123 of 302 | |
| Share of residential buildings heated with electricity (2025) | 27.7% | – | 39.8% | ranked 290 of 302 | |
| Share of residential buildings heated with geothermal heat (2025) | 1.6% | – | 5.5% | ranked 293 of 302 | |
| Share of residential buildings heated with oil or gas (2025) | 11.6% | – | 17.1% | ranked 242 of 302 | |
| Share of residential buildings heated with wood or peat (2025) | 54.3% | – | 29.1% | ranked 4 of 302 |
Economy
| Indicator | Isojoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Business establishments (2024) | 403 no. | 26,415 no. | 600,547 no. | ranked 242 of 308 | |
| Business establishments per 1,000 inhabitants (2024) | 224.6 /1,000 inh. | 138.9 /1,000 inh. | 141.7 /1,000 inh. | ranked 7 of 302 | |
| Median disposable cash income per consumption unit (2024) | 28,475 €/year | – | 29,044 €/year | ranked 187 of 302 | |
| Active companies in the business register (excluding sole traders) (2026) | 123 per 1,000 inh. | 11,080 per 1,000 inh. | 335,854 per 1,000 inh. | ranked 245 of 308 | |
| Active companies in the register per 1,000 inhabitants (excluding sole traders) (2026) | 69.5 per 1,000 inh. | 58.5 per 1,000 inh. | 53.9 per 1,000 inh. | ranked 52 of 302 | |
| Companies registered in the last 12 months per 1,000 inhabitants (2026) | 3.4 per 1,000 inh. | 2.8 per 1,000 inh. | 2.7 per 1,000 inh. | ranked 87 of 302 |
Employment
| Indicator | Isojoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Persons employed in the area (jobs) (2024) | 662 no. | 76,800 no. | 2,423,433 no. | ranked 245 of 308 | |
| Unemployed as a share of the labour force (2024) | 5.9% | 8.8% | 10.8% | ranked 280 of 302 | |
| Employment rate (aged 20–64) (2024) | 80.1% | 77.3% | 75.4% | ranked 59 of 302 |
Transport
| Indicator | Isojoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Passenger cars per 1,000 inhabitants (2025) | 650 /1,000 inh. | 596 /1,000 inh. | 580 /1,000 inh. | ranked 20 of 302 |
Society
| Indicator | Isojoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| At-risk-of-poverty rate (2024) | 16.2% | 13.7% | 14.3% | ranked 85 of 302 |
Education
| Indicator | Isojoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of people aged 15 and over with a tertiary-level qualification (2024) | 17.8% | 27.7% | 24.1% | ranked 285 of 302 |
Business sectors: Isojoki
Share of each sector in total jobs; “×1.5” means the sector is 1.5 times more common than nationally.
- Manufacturing21.0% ×1.7
- Health and social work19.7% ×1.0
- Agriculture, forestry and fishing18.3% ×7.5
- Construction7.2% ×1.1
- Wholesale and retail trade6.9% ×0.6
- Transport and storage4.8% ×0.9
- Education4.8% ×0.6
- Public administration and defence3.2% ×0.6
Sunshine and temperatures: Isojoki
Where is Isojoki?
Frequently asked questions
What is the population of Isojoki?
Isojoki has 1,771 residents (2025), ranking 266 of 308 municipalities.
How big is Isojoki?
Isojoki covers 642.4 km², with a density of 3 people per km².
Is the population of Isojoki growing?
Between 2015 and 2025, the population of Isojoki went from 2,123 to 1,771, a change of −16.6%.
Where is Isojoki?
Isojoki is in South Ostrobothnia. Latitude 62.114, longitude 21.958.
Share of residential buildings heated with wood or peat: what is the figure for Isojoki?
In Isojoki, “Share of residential buildings heated with wood or peat” stands at 54.3% (2025), ranking 4 of 302 municipalities; the national median is 29.1%.
Business establishments per 1,000 inhabitants: what is the figure for Isojoki?
In Isojoki, “Business establishments per 1,000 inhabitants” stands at 224.6 /1,000 inh. (2024), ranking 7 of 302 municipalities; the national median is 141.7 /1,000 inh..
How much electricity does a solar panel produce in Isojoki?
In Isojoki, a 1 kWp south-facing system tilted at 44° produces about 876 kWh a year.
Which municipalities border Isojoki?
The nearest to Isojoki are Karijoki (25 km), Siikainen (27 km), Karvia (31 km), Kristinestad (35 km), Kauhajoki (36 km).
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