Using the 2000 Mexican Census, we examined whether the level of migration was associated with total fertility and the proportion of women married in 314 municipalities from seven traditional sending states. Across these municipalities, we observe lower fertility in higher-migration areas. Municipalities in the quartile with the highest levels of migration have total fertility more than half a child lower than municipalities in the lowest migration quartile. However, there are no differences in marital fertility by level of migration, indicating that lower proportions of women married account for lower total fertility in high-migration municipalities. In municipal-level regression models, lower sex ratios are associated with a lower proportion of women married, while there is an inverse association between education and marriage. The level of migration also has an independent association with marriage, suggesting that there may be changing ideas surrounding family formation in high-migration areas.