CDC - Influenza (Flu) | Weekly US Map: Influenza Summary Update
As of Feb 19th Oregon and Washington are hard hit, as is much of the SouthEast. The CDC doesn't split out Northern California from southern, but I've heard anectdotal reports that suggest San Francisco may resemble Portland. Minnesota is still on the quiet side. The CDC says some of the current strains are different enough that even vaccinated persons may be susceptible. Early treatment with antivirals can significantly shorted duration of illness; this works best when a family member is known to have the flu and others start to develop very early symptoms. A script for antivirals for family members may be written when the index case is diagnosed (helps if you're seeing a family doc!).
It will be interesting to see next week's map.