Maryland chicken laws:
Anne Arundel County, MD. No livestock or domestic fowl on lots smaller than 40,000 sq ft. Combinations of fowl must not exceed the ratio of 1 bird unit (= 32 chickens) per 40,000 sq ft. All fowl must be kept within a fenced area. Accessory structures for fowl and manure storage must be at least 50 ft. from side and rear lot lines.
Baltimore County, MD. Must have 1 acre of land to have poultry.
Baltimore City, MD. Up to four chickens can be kept (no roosters) as long as they are confined to a moveable pen that is kept 25 feet away from all residences.
Baltimore City, MD. You can have up to for hens, no roosters, must have a permit.
Prince George's County, MD. Does not permit chickens to be kept in these residential zones: R-E, R-1, R-2, R-3. As of Feb. 2012, there are plans to revise the zoning ordinance to permit a limited number of chickens in residential subdivisions.
Rockville, MD. Chickens are not allowed; neither are ducks, goats, or anything
primarily kept on a farm.
I am sure this is not all inclusive, though, and it does not include HOAs that exclude chickens, like the one where we used to live in southern AA county. There may be other cities and towns that exclude chickens.
http://thecitychicken.com/chickenlaws.html Is the source.
ETA: they are not allowed in residential areas of Frederick the city or Brunswick, even though we have them out in the county of Frederick.
I cannot find any restrictions at all for Harford county. Maybe check with your city/town and county.
ETA2: it looks like there are no restrictions in St. Mary's county, but Charles seems to restrict to 1 bird per half acre.
http://www.charlescounty.org/webdocs/pgm/publications/planning/zoning_ord 2008.pdf. Now I'm glad we didn't move there! We almost bought a place there...glad the seller was crazy and we escaped that contract. I'd be in huge trouble!
Calvert has lot size restrictions, but some dear friends of mine were successful in obtaining a special exception
http://www.thebaynet.com/News/index...29393/comment_categoryID/29393-News/comment/Y. They live in a typical residential neighborhood in Huntingtown.