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Between 2008 and 2018, six states and Washington, D.C., began contracting with enrollment brokers to facilitate enrollment into Medicaid, joining the eighteen states that already had such contracts in place as of 2008. Using newly collected data covering all contracts between state Medicaid agencies and independent enrollment brokers during this period, we compared changes in Medicaid participation following the initiation of contracts with enrollment brokers with contemporaneous changes in Medicaid participation in states that never contracted with brokers. We found that contract initiation had no statistically significant effects on state-level Medicaid participation. We further found no evidence of other enrollment-related benefits, such as improved application processing times.