Ilmajoki: population and statistics
Ilmajoki has a population of 12,405 (2025) across 576.7 km², or 21.5 people per km². It ranks 82 of 308 municipalities by population. Its population is growing: +2.0% between 2015 and 2025.
- 12,405 residents
- 576.7 km²
- 22 people/km²
- 42 m
Ilmajoki in numbers
Key points
Among the 18 municipalities in South Ostrobothnia, Ilmajoki ranks No. 6 by population.
Share of people aged under 15: 18.5% in Ilmajoki, compared with an average of 14.9% in South Ostrobothnia and 14.3% nationally.
Free-time residential buildings per 1,000 inhabitants: 22.4 /1,000 inh. in Ilmajoki, compared with an average of 67.9 /1,000 inh. in South Ostrobothnia and 85.9 /1,000 inh. nationally.
Largest business sector: Health and social work, with 25.3% of the area's jobs.
A 1 kWp solar panel tilted at 45° generates about 874 kWh a year here.
Did you know?
- Number 1 in South Ostrobothnia for “Share of people aged under 15”.
- Number 1 in South Ostrobothnia for “Share of residential buildings heated with geothermal heat”.
- “Share of people aged under 15”: higher than in 92% of municipalities.
- “Free-time residential buildings per 1,000 inhabitants”: lower than in 90% of municipalities.
- Its area is roughly equal to 80,773 football pitches.
- The nearest more populous municipality is Seinäjoki (67,283 residents), 15 km away.
- A 4 kWp rooftop solar system here would generate about 3,496 kWh a year, roughly what an average household uses.
Population of Ilmajoki over time
Ilmajoki had 12,159 residents in 2015 and 12,405 in 2025.
| Year | Population |
|---|---|
| 2020 | 12,294 |
| 2021 | 12,366 |
| 2022 | 12,369 |
| 2023 | 12,343 |
| 2024 | 12,429 |
| 2025 | 12,405 |
All indicators for Ilmajoki
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 | Ilmajoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of people aged under 15 (2025) | 18.5% | 14.9% | 13.3% | ranked 25 of 302 | |
| Share of people aged 65 and over (2025) | 23.1% | 27.7% | 31.2% | ranked 254 of 302 | |
| Mean age of the population (2025) | 42.6 years | 45.7 | 48.5 | ranked 265 of 302 | |
| Share of Swedish speakers (2025) | 0.2% | 0.3% | 0.3% | ranked 154 of 302 | |
| Share of foreign nationals (2025) | 1.5% | 3.9% | 3.4% | ranked 268 of 302 |
Housing
| Indicator | Ilmajoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Total dwellings (2025) | 6,238 no. | 109,577 no. | 3,258,449 no. | ranked 91 of 308 | |
| Share of dwellings built before 1940 (2025) | 12.0% | – | 8.2% | ranked 76 of 302 | |
| Share of dwellings built after 2000 (2025) | 27.9% | – | 14.5% | ranked 50 of 302 | |
| Share of dwellings in detached and semi-detached houses (2025) | 71.4% | – | 64.5% | ranked 75 of 302 | |
| Share of dwellings in blocks of flats (2025) | 6.4% | – | 11.1% | ranked 203 of 302 | |
| Share of dwellings not permanently occupied (2025) | 12.1% | – | 16.9% | ranked 229 of 302 | |
| Free-time residential buildings per 1,000 inhabitants (2025) | 22.4 /1,000 inh. | 67.9 /1,000 inh. | 186.3 /1,000 inh. | ranked 271 of 302 |
Energy
| Indicator | Ilmajoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of residential buildings heated with district heating (2025) | 5.1% | – | 3.9% | ranked 118 of 302 | |
| Share of residential buildings heated with electricity (2025) | 34.7% | – | 39.8% | ranked 236 of 302 | |
| Share of residential buildings heated with geothermal heat (2025) | 11.5% | – | 5.5% | ranked 38 of 302 | |
| Share of residential buildings heated with oil or gas (2025) | 19.7% | – | 17.1% | ranked 106 of 302 | |
| Share of residential buildings heated with wood or peat (2025) | 28.9% | – | 29.1% | ranked 154 of 302 |
Economy
| Indicator | Ilmajoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Business establishments (2024) | 1,528 no. | 26,415 no. | 600,547 no. | ranked 83 of 308 | |
| Business establishments per 1,000 inhabitants (2024) | 122.9 /1,000 inh. | 138.9 /1,000 inh. | 141.7 /1,000 inh. | ranked 196 of 302 | |
| Median disposable cash income per consumption unit (2024) | 30,737 €/year | – | 29,044 €/year | ranked 72 of 302 | |
| Price per m² of old dwellings in housing companies (2025) | 1,718 €/m² | – | 1,110 €/m² | ranked 47 of 220 | |
| Active companies in the business register (excluding sole traders) (2026) | 587 per 1,000 inh. | 11,080 per 1,000 inh. | 335,854 per 1,000 inh. | ranked 92 of 308 | |
| Active companies in the register per 1,000 inhabitants (excluding sole traders) (2026) | 47.3 per 1,000 inh. | 58.5 per 1,000 inh. | 53.9 per 1,000 inh. | ranked 215 of 302 | |
| Companies registered in the last 12 months per 1,000 inhabitants (2026) | 2.3 per 1,000 inh. | 2.8 per 1,000 inh. | 2.7 per 1,000 inh. | ranked 186 of 302 |
Employment
| Indicator | Ilmajoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Persons employed in the area (jobs) (2024) | 3,397 no. | 76,800 no. | 2,423,433 no. | ranked 97 of 308 | |
| Unemployed as a share of the labour force (2024) | 6.9% | 8.8% | 10.8% | ranked 266 of 302 | |
| Employment rate (aged 20–64) (2024) | 81.6% | 77.3% | 75.4% | ranked 34 of 302 |
Transport
| Indicator | Ilmajoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Passenger cars per 1,000 inhabitants (2025) | 617 /1,000 inh. | 596 /1,000 inh. | 580 /1,000 inh. | ranked 59 of 302 |
Society
| Indicator | Ilmajoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| At-risk-of-poverty rate (2024) | 9.8% | 13.7% | 14.3% | ranked 250 of 302 |
Education
| Indicator | Ilmajoki | South Ostrobothnia | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of people aged 15 and over with a tertiary-level qualification (2024) | 28.5% | 27.7% | 24.1% | ranked 80 of 302 |
Business sectors: Ilmajoki
Share of each sector in total jobs; “×1.5” means the sector is 1.5 times more common than nationally.
- Health and social work25.3% ×1.3
- Education13.1% ×1.8
- Agriculture, forestry and fishing10.2% ×4.2
- Manufacturing8.6% ×0.7
- Construction8.0% ×1.2
- Wholesale and retail trade7.6% ×0.7
- Transport and storage5.8% ×1.1
- Administrative and support services4.5% ×0.6
Sunshine and temperatures: Ilmajoki
Where is Ilmajoki?
Frequently asked questions
What is the population of Ilmajoki?
Ilmajoki has 12,405 residents (2025), ranking 82 of 308 municipalities.
How big is Ilmajoki?
Ilmajoki covers 576.7 km², with a density of 22 people per km².
Is the population of Ilmajoki growing?
Between 2015 and 2025, the population of Ilmajoki went from 12,159 to 12,405, a change of +2.0%.
Where is Ilmajoki?
Ilmajoki is in South Ostrobothnia. Latitude 62.732, longitude 22.581.
Share of people aged under 15: what is the figure for Ilmajoki?
In Ilmajoki, “Share of people aged under 15” stands at 18.5% (2025), ranking 25 of 302 municipalities; the national median is 13.3%.
Free-time residential buildings per 1,000 inhabitants: what is the figure for Ilmajoki?
In Ilmajoki, “Free-time residential buildings per 1,000 inhabitants” stands at 22.4 /1,000 inh. (2025), ranking 271 of 302 municipalities; the national median is 186.3 /1,000 inh..
How much electricity does a solar panel produce in Ilmajoki?
In Ilmajoki, a 1 kWp south-facing system tilted at 45° produces about 874 kWh a year.
Which municipalities border Ilmajoki?
The nearest to Ilmajoki are Seinäjoki (15 km), Kurikka (16 km), Isokyrö (33 km), Lapua (34 km), Laihia (40 km).
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