This dissertation explores topics in urban and labor economics, separately and together. In Chapter 1, I explore human capital spillovers between workers and across neighborhoods. I first show that college-educated and non-college workers tend to work in the same Census tracts. I then estimate an economic geography model and find a positive spillover effect of nearby college workers but a negative spillover effect of nearby non-college workers on a worker’s income. Both spillover effects decay very quickly, having no effect beyond three miles. I conduct counterfactual exercises to assess the benefits of a Los Angeles policy. The exercise shows that policies increasing density of college jobs provide benefit to both the targeted and surround...