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Amid the current US opioid crisis, hepatitis C virus (HCV) infection rates continue to rise in young adults, including among pregnant women, yet few studies describe linkage to care and treatment in pregnant or postpartum women with HCV infection. We used electronic health record data to estimate HCV treatment rates for postpartum women before (January 2014‐September 2016) and during (October 2016‐March 2018) implementation of a maternal–infant HCV linkage program in combination with a multidisciplinary clinic to colocate mother and infant care. Using Poisson regression models, we compared HCV treatment initiation rates, adjusting for demographics, substance use, and treatment. From January 2014 through March 2018, 343 women who were HCV seropositive delivered at our institution. Of these, 95% completed HCV nucleic acid testing and 255 women had chronic HCV infection. Mean age was 30 years, 96% were publicly insured, and 94% had documented substance use. HCV treatment initiation increased from 28/164 (17.1%) women with chronic HCV infection in the preintervention period to 16/66 (24.2%) with the linkage‐only intervention and 13/25 (52.0%) with the linkage intervention and colocated care. Adjusted analyses demonstrated that women delivering during the intervention period initiated HCV treatment at 2.40 times (95% confidence interval [CI], 1.10‐5.25; linkage only) and 3.36 times (95% CI, 1.57‐7.17; linkage and colocated care) the rate of women delivering preintervention. Women on buprenorphine had higher HCV treatment initiation rates compared with those on methadone (rate ratio, 2.10; 95% CI, 1.05‐4.21). Conclusion: HCV linkage to care and treatment rates improved in the setting of mother–infant linkage and colocated care interventions. Perinatal care may represent a critical venue to identify, link, and treat women for HCV infection to improve their own health and prevent transmission to subsequent pregnancies., Although US national guidelines now recommend screening all pregnant women for Hepatitis C virus (HCV) amidst rising incidence rates, few studies describe practices to link diagnosed women to HCV cure after pregnancy. This study measures HCV treatment initiation rates before and during implementation of a perinatal linkage to care program and maternal‐infant co‐located care clinic, adjusting for follow‐up time, age, and substance use. We found 2.4 to 3.9‐fold increased HCV treatment rates among women who delivered a baby since the programs began, compared with those who delivered prior, highlighting a simple intervention to improve HCV cure rates to help reach HCV elimination goals.