The three provinces in Indonesia with the highest number of filariasis cases are Aceh, East Nusa Tenggara and Papua. In the province of Aceh, the district with the highest number of filariasis cases is Aceh Utara District. This research takes an approach of observational research with descriptive design. The samples taken were total population of filariasis patients in two subdistricts, Baktiya and Nisam Sub-district, Aceh Utara District with 35 cases. The result of research showed that most filariasis patients were 60 years old, predominantly male patient with 54,3% and majorily possessed junior high school as their highest level of education, 48,8%. Most often encountered behavior associated with filariasis occurrence is outdoors gers at night by 54.3% and not using anti-mosquito repellent of 68.6%. Positive behavior encountered was the habit of using bed nets during sleep by 62.9%, and the habit of wearing clothes and trousers by 57.1%. The physical and outdoor environments found are not using of wire screening of 80%, poor ceiling conditions of 77.1%, 77.4% of hanging items at home, 80% poor waste water sewer condition conditions and the presence of paddy fields and shrubs, bushes around the house of 88.6%.