Field guides to the birds of countries? Plenty of ’em.
Field guides to the birds of geographic regions? Common.
Field guides to the birds of states or provinces? At least one for each.
Field guides to the birds of counties? If you have a good extension service or an enthusiastic bird watching club, sure.
Field guides to the birds of cities? Only the biggest ones have them.
Field guides to specific urban neighborhoods? When Leslie Day’s new book Field Guide to the Neighborhood Birds of New York City is published by Johns Hopkins University Press, then yes, there will be – one.