Background: Obstructive sleep apnea is a chronic morbid condition characterized by frequent attacks of upper airway collapse during sleep leading to interrupted sleep cycle and daytime fatigue. Objectives: Assessment of the most affected group of adults by obstructive sleep apnea disorder in western area of Saudi Arabia and help them to get a good quality of life. Methods: Cross sectional study involving 214 adults with age between 18 and 80 years old in the western area of Kingdom of Saudi Arabia. Results: There was no relationship between specific genders with high risk of OSA, while there was strong relationship between participants from male gender with low risk of OSA. Also, there was no relationship between age and high risk of having OSA among our participants. In addition, there is no relationship between age and low risk of having OSA among our participants. There was a relationship between overweight participants from both gender and high risk of having OSA, while there was relationship between underweight participants from both gender and low risk of having OSA. Conclusion: Our study showed that around 28% of populations are in high risk group of having OSA. Also, sleep apnea in older patients is less severe than sleep apnea in the young.