Before the Jewish necropolis was established in Mrągowo, the local Orthodox Jews had buried the deceased in the cemeteries in Ryn or Młynów. A rather big Jewish cemetery,[1.1] at today’s 2 Brzozowa Street, was established in 1859 at the area given to the kehilla by Justyna Timnik, a mayor's widow (Timnik’s shop was situated in the corner of the Market, and was adjacent to the shops of the Jewish merchants[1.2]). The cemetery was located at the end of the Catholic cemetery. It was devastated in 1936 (or 1938). The Fascists might have planted bombs by the graves of the most prominent Jews. However, the Jewish cemetery survived the war, and in 1946 or 1947 most probably by the decision of the village headman, named Krzewoński, was demolished: all the surface traces of the necropolis were removed. Supposedly single tombstones were placed at the stairs of gates to the evangelical cemetery, and in the foundations of some of houses built after the war. During the 1980s at the part of the cemetery from the side of a street, a dry cleaner's was built. On the rest a car park was created.[1.3]. Today the area of the former Jewish cemetery is marked by the slope and single trees (limes and maples) growing on the edge of the necropolis.

In October 2009 took place a competition, where local students sent their depictions of the cemetery. [ngo.pl, Nov. 30th 2009., more>>].