The Statistisches Zentralamt in Vienna has
the RESULTS of the census (Volkszählung) in the Austria Empire (without Hungary) in 1869, 1880, 1890, 1900 and 1910. Here you can find e.g. statistical information about number of inhabitants and
houses per village/town -- but NO NAMES of individuals.
The source documentation (the enumeration sheets) was largely destroyed in the Palace of Justice fire in 1927. Some documentation is still available at the Staatsarchiv in Vienna but most of it is badly damaged (by fire and water), is difficult to handle, nearly impossible to read and may not be photocopied.