BELLEVUE, Wash. — Washington state's 10 most expensive ZIP codes all are congregated in the same county, a new report finds. King County is home to each of the most expensive areas in the state ...

This map highlights in yellow the ... Finding Super Zips: The Washington Post analyzed census data to find Zip codes where people rank highest on a combination of income and education.

Fifty-three ZIP codes in Greater Washington rank among the nation’s ... residents with an income per capita of $101,859. Here's a map of the 50 local ZIP codes that made the Wealthy 1000 ...