Teaching was a critical occupation for women in the early 20th century, accounting for 25% of women’s white-collar work in 1920. It was also among the highest-paying female-dominant professions. In this paper, I study how access to teaching affected the trajectory of women’s labor, marriage, and fertility outcomes. Using newly digitized records from over a decade of Illinois teacher certification exams linked to the full-count census (1910–1950), I implement a regression discontinuity design around pass thresholds, using individuals’ first exam-attempt scores to identify individual-level variation in women’s access to teaching. I find that marginal passers are 40% more likely to have ever been teachers and 25% more likely to have ever been in the labor force in subsequent decennial censuses. Labor force effects persist into the very long run, and by 1940 marginal passers earn significantly more income. I also find that teaching both delayed and deterred marriage, and reduced completed fertility driven mainly by childlessness. Ongoing work tests for spillover and intergenerational effects of women’s work by examining effects on sisters’ and children’s education and labor outcomes.