Nationally, a "typical" egg only farm selling to grocery stores chains before bird flu had a million or more laying hens in their operations. If you didn't have 250,000 birds at least you had a hard time competing for this market because the margins were so thin. That's one reason you've seen the great rise in very small egg producers, the mega barn layers just weren't producing as good of tasting eggs or people were scared of diseases and other health issue. Interesting note, my SiL on the wife's side and a friend of mine won't eat fresh free-range eggs because the vibrant yellow-orange yolks freak them out (as well as the eggs being fertilized).

The number crunchers & cartographers at the USDA have gone and combined all poultry/egg sales market value in their most recent census of ag (2012 and 2007) so I had to go back to 2002 to get a map of just laying hen numbers. Some of the counties that are lite up with lots of dots represent just a farm or two of industrial egg layers. I suspect the map has changed some this year...

http://www.agcensus.usda.gov/Publica...0Inventory.gif