Some data on the largest retail pharmacies [pdf]: http://www.drugstorenews.com/sites/drugstorenews.com/files/PowerRx_042715.pdf http://www.drugstorenews.com/sit

Some data on the largest retail pharmacies [pdf]: http://www.drugstorenews.com/sites/drugstorenews.com/files/PowerRx_042715.pdf http://www.drugstorenews.com/sites/drugstorenews.com/files/P... It has figures for total stores and stores with pharmacies, and it looks like it is either most or all.