Interactive Map Shows Mismatch Between Need and Giving

In a state with a moderate standard of living, Collin County, Tex., stands out.

The suburban area north of Dallas has a median household income of more than $79,000, 64 percent higher than the state average. In September, Money magazine ranked the county seat, McKinney, the best place to live in America.

But as a racial incident in Mc­Kinney that drew national attention revealed, not everyone who lives there enjoys its resources equally. Responding to a disturbance call at a community pool, a white police officer brandished his gun at several African-American teenagers and pinned one girl to the ground.

Racial and economic divides may affect life in McKinney in ways subtler than police violence. They may blind people to their neighbors’ need.