We just returned from two nights at Codorus.  We stayed at two different sites in the A loop, #18 and #31.  Both were very shaded and large.  There is a lot of space between most of the A loop sites which we prefer.  

A loop is non electric sites and has a nice, clean bath house with warm showers.  

The playground is over between the C and D loops, a pretty long walk from A loop which is the only real downside for my son and me.