Purpose: This study was conducted to help with the development of an intervention program in efforts to prevent suicidal ideation and suicide. The study also sought to generate strategies for improving health conditions by ascertaining and analyzing potential factors that may influence suicidal ideation according to age group in adults. Methods: Data on general characteristics and suicidal ideation from 447 adults aged between 20 and 59 years, living in Y city, Gyeonggi Province, South Korea, were collected based on a structured questionnaire, The data were analyzed using SPSS20.0 statistics program. Results: The results showed that 48.6% of young and older adults have experienced suicidal ideation while 44.5% of middle-aged adults have had suicidal thoughts. With regard to suicidal ideation, young and older adults revealed relevant differences in terms of gender, residential type, degree of stress and subjective physical and mental health, while middle-aged adults revealed relevant differences in terms of marital status and degree of stress. With regard to factors that influence suicidal ideation, it was found that the relevant variables of young and older adults included gender, residential type, depression, degree of stress, and subjective physical and mental health, while for middle-aged adults, relevant variables included marital status and degree of stress. Conclusion: These findings indicate that as stress and depression decreases, subjective physical and mental health improves. Therefore, this study proposes that developing and operating an intervention program can help prevent suicidal ideation in local residents.