The 10 of 15 richest counties are around DC, because

来源: 于 2012-05-17 14:20:35 [旧帖] [给我悄悄话] 本文已被阅读：次

Fed government spends our tax money there.

10 of 15 richest, or 4 of top 5 richest are around DC:

http://www.thestreet.com/story/11415107/1/the-richest-counties-in-america.html