Family planning is a method of controlling fertility which helps to prevent unwanted pregnancies among couples. Unwanted pregnancy has negative effects for mothers and children. The aims of this study were to determine the prevalence of family planning practices among women in Serdang area and associated factors with their family planning practices. A cross sectional study was conducted with a systematic random sampling of 349 women of reproductive age, who attended Sri Kembangan Polyclinic. Descriptive analysis with chi-square and multiple regression analysis were conducted to identify factors associated with the family planning practice. The prevalence of family planning practice was 38.4%. Family planning was significantly associated with age (p=0.001), marital status (p=0.001), mode of delivery of the last pregnancy (p=0.001), number of children (p=0.001), source of information (p=0.004), level of knowledge (p=0.001), and the attitude (p=0.004). Using multiple logistic regression, four factors contributed to family planning practice, were identified as statistically significant: marital status (married OR=40, 95% CI: 9.45, 169.8), religion (Muslim OR=1.9, 95% CI: 1.14, 3.4), number of children (children>4 OR=2.98, 95% CI:1. 74, 5.09) and attitude (positive attitude OR=1.88, 95% CI:1.11, 3.18). The prevalence of family planning practice in Serdang was low even though knowledge was sufficient. The use of pamphlets and booklets are still needed to enhance efforts in health education. Currently, practice on family planning will determine the future structure of the community and the economic wellbeing of a country. Future study should focus on family planning practice among teenager and types of methods for women.