New York City’s 3-K for All program was first introduced to a few districts beginning in 2017 and was gradually made available to all districts by 2021. The rollout prioritized the highest-need districts for prekindergarten services. This report focuses on the role of New York City’s 3-K in supporting mothers’ labor force participation and employment. Using data from the Early Childhood Poverty Tracker, which repeatedly surveyed the same New York City families with young children from 2017 to 2021, the report investigates whether 3-K availability was associated with increased labor force participation and employment among mothers of preschool-age children in New York City. (author abstract)