Under the Austrian Empire (Galicia was established in 1772), buildings were given conscription numbers, which served as addresses until 1871. (See also examples of conscription numbers in other parts of the Austrian Empire: Vienna, Klosterneuburg, and Przemyśl.)
“House numbers, also called house conscription numbers, had their origins with the Austrian imperial regime’s need to know the names of all eligible men who could be drafted into the army when the need arose. A metal plaque with a number was attached to each house. With this number in the records of births, military officials could examine the transcripts in the bishop’s office and calculate the age of everyone in a particular house,” from John D. Pihach’s Ukrainian Genealogy.
The first conscription numbers, especially in the city center, were given in sequential order to already existing buildings (beginning with the city hall). But as new buildings were built, they received the next available number. So, for the most part, the conscription numbering system was chronological.
In addition to the city center (Середмістя), Lviv was divided into four districts: 1 – Halytska, 2 – Krakivska, 3 – Zhovkivska, 4 – Brodivska (later Lychakivska). Thus each conscription number that was attached to a building in one of these districts also included a fraction showing in which district out of the 4 the building was located. The lower the conscription number, the older the building was in the district.
It is also worth noting that the boundaries of the districts changed throughout the years, albeit not significantly. Also, conscription numbers of certain buildings and/or plots may have changed — for example, if an old plot was redivided it could have been given new numbers, or if a building was torn down the new one could have received a new one.
Some of the original conscription numbers can still found on buildings in Lviv. Several kinds of signs and plaques were used to display the conscription numbers. Some just show numbers; others have either “No.” or “No. Konskr.” a Polish abbreviation of “Conscription No.”
Two examples from the city center, hence without district numbers
Examples from other districts
Collection of old street signs, including two conscription numbers, in courtyard of Kupol restaurant