ABSTRACTRecent research has indicated that individual income distribution in the United States has tended toward greater inequality in recent years. Hypotheses are presented on the expected effect of that trend on suburban municipalities within large metropolitan areas. One major expectation is that the distribution of per capita incomes among the municipalities will be found to bifurcate. A methodology that rests on a graphical depiction of income and a revision of the famous Pearson plane is used to identify trends. Results indicate that the long term trend (at least since 1960) toward income homogeneity came to a halt by 1979 and began to reverse itself in the early 1980s, although bimodal distributions of income are not yet (1983) in evidence. Rapidly growing and rich communities are tending toward greater internal income homogeneity.