To determine the prevalence and the causative organisms of asymptomatic bacteriuria among pregnant women attending their first prenatal visit at King Abdulaziz University Hospital and in a private clinic at Dr. Erfan and Bagedo Hospital, Jeddah, Saudi Arabia. A retrospective analysis was performed of the routine prenatal screening (urine culture tests) of 9,698 women attending their first prenatal clinic visit between 1 January 2004 to 31 December 2007. They were reviewed, analyzed, and correlated with data on patients’ age, nationality, gravidity, and number of previous abortions. Of 9,698 women, only 166 (1.7%) showed significant bacterial growth, and 1,918 patients (19.8%) were reported as heavy mixed growth. The most common bacterium isolated was Escherichia coli on 88 patients (53%). In this study, low prevalence of bacteriuria among pregnant women was compared to the only two available published studies conducted in the 80's in Saudi Arabia. In view of the lack of information regarding asymptomatic bacteriuria in pregnancy, and the findings of this study, the importance of a conducting a nation-wide survey to guide the revision of practice on a national scale in Saudi Arabia has increased.