Washington tops Best Cities for Business By: MarketWatch December 13, 2011 at 00:00 AM EST The capital sports plenty of companies large and small, a strong economy, low jobless rates and, of course, a huge governmental infrastructure to lean on. Read More >> Related Stocks: 3M Co Berkshire Hathaway Berkshire Hathaway Best Buy Biogen Idec Boeing Co Boston Scientific ConAgra Foods Devon Energy EMC Corp Genl Mills Northrop Grumman Union Pacific UnitedHealth Group