Altheim is a town in eastern Austria. It is situated within the District of Braunau am Inn in the traditional region of Innviertel in the state of Upper Austria. It lies on the small river known as the Mühlheimer Ache, a tributary of the River Inn.

Historical population

Year Pop. ±% 1869 2,371 —     1880 2,361 −0.4% 1890 2,604 +10.3% 1900 2,681 +3.0% 1910 2,796 +4.3% 1923 2,806 +0.4%

Year Pop. ±% 1934 3,215 +14.6% 1939 3,134 −2.5% 1951 3,815 +21.7% 1961 4,271 +12.0% 1971 4,829 +13.1% 1981 4,684 −3.0%

Year Pop. ±% 1991 4,681 −0.1% 2001 4,875 +4.1% 2011 4,801 −1.5% 2021 4,989 +3.9%

In 1985 archaeologists discovered the ruins of a Roman villa in farmland just outside Altheim. In the town there is a Roman museum dedicated to these findings, the Ochzethaus Archived 2009-03-14 at the Wayback Machine.

• Braunau am Inn
• Linz
• Upper Austria

• Town hall website
• Altheim TV