I called Harford County Zoning and got a weird answer:
The woman I talked to said that any pet home, whether for dog or chicken, and whether permanent or totally impermanent and moveable, has to be at least 50 feet from any property line.
This means that anyone who lives on a lot smaller than at least 100' wide should not have a doghouse on their property, let alone a chicken coop. I'm pretty sure I've seen doghouses around Harford County on lots way smaller than mine!!!
Since we have neighbors who've had chickens and roosters for the past 6 years without issues, we're going for it anyway.
Wish us luck!!!
PS- Has anyone in Harford County ever gotten busted by the chicken police?