The aim of the research is determining the factors which effect the tourism demand of Sinop domestic tourists. The data of the study were obtained by survey method. Main mass of the study is domestic tourists who coming holiday to Sinop were formed based 1547 bed capacity of 24 Hotel, 2 holiday village, 4 motel in Sinop city centre. Depending on the main mass of the sample size was calculated to be 236. 307 survey of 500 questionnaires were evaluated considering the faulty survey. The survey

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... a was tested using with descriptive statistics including frequency and percentage and factor analyses. According to the factor analysis, the factors of effect tourism demand of domestic tourists who coming holiday to Sinop are in order of enviromental, the others (advertisement and promotion), economics and social.