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The map above shows the percentage of households in each D.C. ZIP code consisting of unmarried people without children. The map, assembled by the D.C. Office of Revenue Analysis using 2013 tax data, shows what many of us already know: D.C. is a city dominated by childless singles. The majority of households in all but four ZIP codes are childless singles. The three ZIP codes east of the Anacostia River comprise most of the exceptions; the fourth is is the area of Upper Northwest around Chevy Chase and Barnaby Woods. In the neighborhoods just north and west of downtown, more than three-quarters of households consist of childless singles.

So who makes up the plurality east of the Anacostia? Singles with dependents—-in other words, unmarried people with children. Here’s a map showing the percentage of households consisting of singles with dependents by ZIP code:

There are very few unmarried people with children in the neighborhoods west of Rock Creek Park. These neighborhoods have the most married people without dependents (the coveted DINCs—-double income, no children) of any in the city…

…and the most married people with dependents:

The data here aren’t perfect: They only count people who filed taxes, and the Office of Revenue Analysis decided to exclude people who filed as domestic partners in order to simplify the results. But the maps still illuminate a persistent divide in the city. Households with two incomes and no children to provide for are concentrated in the west, while those with just one parent caring for children are largely in the east.

We’ll have an interactive map of the geographic distribution of homeless children in the city coming shortly, and it’ll only reinforce this divide. Stay tuned.