[akira2501]

There are no median families. There are a lot of very high wage earners in CA. You should really be looking for the mode here.

[piva00]

I agree, the mode is probably better. Anyway from the median you can also get a good guess of how much income the band sitting between 25%-75% has since it's a normal distribution. Either comparison should be ok for a guesstimate of the impact of electricity bills for a family in California vs different parts of the UK.