Household type is strongly correlated with household income. Married couples are disproportionately represented in the upper two quintiles, compared to the general population of households. Cross-referencing shows that this is likely due to the presence of multiple income earners in these families. Non-family households (individuals) are disproportionately represented in the lower two quintiles. Households headed by single males are disproportionately found in the middle three quintles; single females head households concentrated in the bottom three quintiles.