This study evaluated homeless women's contraception knowledge and demonstrated improved knowledge following efficacy-based contraceptive counseling. Women were surveyed using a pre-test then post-test following standardized efficacy-based contraceptive counseling. 47 women participated. 13/19 (68.4%) of reproductive-aged women were not using contraception. After education there was significant increase in good-excellent self-rated knowledge (35, 75.5% vs 44, 93.6%; p < .001) and correct identification of most effective contraception OR 5.90 (95% CI = 2.31-15.02; p < .001). In conclusion, homeless women overestimated their understanding of contraception. Following education, there was significantly increased understanding of efficacy. While most did not desire pregnancy, few were using effective contraception and may benefit from education. Abbreviations: SH: Shelter House; LARC: Long-Acting Reversible Contraception; IUD: Intra-Uterine Device; ACOG: American College of Obstetricians and Gynecologists.