Statistical test

No.11671485 ViewReplyOriginalReport
Which statistical test should I use?
I'm deciding which county to move to based on the availability of tendies per capita.
I have a table of the population in each county, and a table of the amount of fast food restaurants serving tendies in each county.
I want to generate a value for each county representing their relative tendie availability per capita as compared to the mean.
But, there is an urban county in this state which has a significantly higher population, I'm not sure fast food restaurants can keep up with this population.
Any clue guys?