This study examines the effect assortative mating by education has on income inequality by household. In contrast to the majority of other literature in this field which focus on the United States (U.S.) as a whole, this study makes use of state-level data to examine the marriage mating market with respect to education attainment. It also examines how homogamous partnerships increase income inequality across households by analyzing changes in the Gini coefficient over time. Panel data for this analysis is from the U.S. Bureau of Economic Analysis and the Integrated Public Use Microdata Series (IPUMS-International and IPUMS-USA) from the U.S. Census of the Population. Assortative mating by education is shown in this analysis to be a contributing factor to increasing inequality among homogamous heterosexual partnerships in the U.S. from 1960 to 2005.