The 1916 German census of the Vilnius Region, however, reported strikingly different numbers.

By 1939 a German census counted a population of 23,130 in the town, almost 100% German Lutherans.

Population data may be inaccurate (see German census of 1895).

Population according to the German census 1905:

The official German census of 1905 listed 470,904 residents, thereof 20,536 Jews, 6,020 Poles and 3,752 others.

The German census of 1916 showed that 51% of Sejny population was Lithuanian.

The number of residents in 1939 according to the last German census was 5867.

The latest action is a boycott of the West German census on the ground that it is an invasion of privacy.

A wall poster denounced the West German census planned for the end of this month as snooping.

According to the 1916 German census, Poles constituted 50% of city's population.