The parish church of St. Sigismund received its patronage when Charles IV, Holy Roman Emperor had the saint's bones transferred from Saint-Maurice in the Swiss canton of Valais to Prague.

The population growth between 1961 and 1971 amounted to 80% owing to the community's favourable location for transport links and widespread building development.

The community council is made up of 14 members, listed here by party or voter community affiliation, and also with the number of seats that each holds, since the 2020 local elections:[3] Altendorf's arms might heraldically be described thus: Under the chief gules, therein a key argent per fess the bit downturned, in Or a horse trippant sable.

The black horse is already seen on a silver coin found in the lands settled by the Celts and believed to have been struck about 80 BC.

According to official statistics, there were no workers on the social welfare contribution rolls working in agriculture or forestry in 1998.