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Granulocytic anaplasmosis is a common vector-borne disease of humans and animals with natural transmission cycle that involves tick vectors, among which Ixodes ricinusis the most important. The present paper reports the prevalence and geographical distribution of A. phagocytophilumin 10,438 questing Ixodes ricinusticks collected at 113 locations from 40 counties of Romania. The unfed ticks were examined for the presence of A. phagocytophilumby PCR targeting a portion of ankA gene. The overall prevalence of infection was 3.42%, with local prevalences ranging between 0.29% and 22.45%, with an average prevalence of 5.39% in the infected localities. The infection with A. phagocytophilumwas detected in 72 out of 113 localities and in 34 out of 40 counties. The highest prevalence was recorded in females followed by males and nymphs. The results and the distribution model have shown a large distribution of A. phagocytophilum, covering Romania's entire territory. This study is the first large scale survey of the presence of A. phagocytophilumin questing I. ricinusticks from Romania.