The kind and extensiveness of parasitic invasion in hens in a small on suburb raisings were estimated. The examinations were done in June 1990 in 6 suburbs of the Olsztyn city. In each suburb feaces of 50 hens (from 10 birds in one poultry house) were examined by the Fülleborn’s method. It was found that about 33% of birds were infected with intestinal nematodes and coccidia. Among the parasites dominated Ascaridia galli (17.3%), Eimeria sp. (11.39%) and Capillaria sp. (9.6%). Despite of a high extensiveness of invasion (from 18.0 to 56.0%) clinical lesions were not observed and the invasion does not affect body weight gains and egg laying.