Hausjärvi is a municipality of Finland. Its seat is in Oitti.
It is part of the Kanta-Häme region. The municipality has a population of ()
The Helsinki–Hämeenlinna and Riihimäki–Saint Petersburg railways marked a turning point for the sparsely populated municipality. The villages of Hyvinkää and Riihimäki, in particular, benefited heavily from becoming junction stations, and they were granted independence from Hausjärvi as market towns in 1918 and 1922, respectively. Later on, the village of Oitti, aided by its station on the Riihimäki–Lahti section, became the administrative center of the remaining parts of Hausjärvi.
- Erkylä
- Hamina
- Hausjärvi
- Hikiä
- Kara
- Karhi
- Kuru
- Lavinto
- Maitonen
- Oitti
- Puujaa
- Rastila
- Rutajärvi
- Ryttylä
- Selänoja
- Syvänoja
- Torhola
- Turkhauta
- Vantaa
Demographics
In 2020, 17.1% of the population of Hausjärvi was under the age of 15, 60.3% were aged 15 to 64, and 22.6% were over the age of 65. The average age was 44.6, over the national average of 43.4 but under the regional average of 45.4. Speakers of Finnish made up 96.4% of the population and speakers of Swedish made up 0.4%, while the share of speakers of foreign languages was 3.2%. Foreign nationals made up 2.5% of the total population.
The chart below, describing the development of the total population of Hausjärvi from 1975-2020, encompasses the municipality's area as of 2021.
Urban areas
In 2019, out of the total population of 8,260, 5,292 people lived in urban areas and 2,897 in sparsely populated areas, while the coordinates of 71 people were unknown. This made Hausjärvi's degree of urbanization 64.6%. The urban population in the municipality was divided between five urban areas as follows:
{| class="wikitable sortable"
! # !! Urban area !! Population
|-
| align="center" | 1 || Oitti || align="right" | 1,855
|-
| align="center" | 2 || Ryttylä ||align="right"| 1,595
|-
| align="center" | 3 || Hikiä ||align="right"| 1,055
|-
| align="center" | 4 || Hyvinkää central locality ||align="right"| 766