Between 1938 and 1948 the library contained an active archival department that collected 40,000 units of archival materials and received the legal deposit copies for all of Estonia.

Katarina Jee has the capacity to hold 3,800 volumes at one time and serves areas where branch libraries are absent or temporarily unavailable.

The service provides books both in Russian and Estonian, with 70% of the materials being Estonian-language titles.

[2] In 2012 the Tallinn Central Library created ELLU, an e-book lending program for works of modern Estonian literature.

Tallinn Central Library is the only library in Estonia that provided copies of modern Estonian literature via e-book, and access to the ELLU system is available to anyone in the world, with registered users being reported from countries in Europe, North America, and Asia.