An identification number is assigned to each Round barn and to each Mail Pouch Barn, Sign etc on this site. An example would be: MPB - 35-71-01.

The MPB indicates Mail Pouch Barn, the second set of numbers identifies the state. Starting in alphabetical order and assigning a number to each state. Ohio = 35, Indiana = 14, West Virginia = 48, etc. Ross county is the 71st county in alphabetical order in the state of Ohio. (The last 2 digits is a number assigned to the barn as it appears on this site.) So the above number would refer to a Mail Pouch barn in Ross Co. Ohio. (This is similar to the covered bridge numbering system used to identify bridges)

Beginning letters used include:

MPB	=	Mail Pouch Barn	RB	=	Round / Polygonal Barn	CA	=	Castle
MPS	=	Mail Pouch Sign (Not on a barn)	RCB	=	Rock City Barn	CB	=	Covered Bridge
KCB	=	Kentucky Club Barn	AdB	=	Advertising Barn	MI	=	Mill
MCB	=	Melo Crown Barn	AtB	=	Artistic Barn	LH	=	Light House
WOB	=	WOW Barn	DsB	=	Design Barn	TTC	=	Tree Trunk Carving
BDS	=	Bull Durham Sign	DtB	=	Dated Barn / Roof Dated	WM	=	Wall Mural
BNB	=	Beech Nut Barn	PtB	=	Patriotic Barn	WT	=	Water Tower
HSB	=	Hill Side Tobacco	RAB	=	Roof Art Barn
TbB	=	General Tobacco Advertising	ReB	=	Religious Theme Barn
			SmB	=	Smile / Face Barn
			SDB	=	Soft Drink Barn