I was at the Southern States in Purceville, VA and they had Golden Comets, Black Sex Links, Easter Eggers, and one other breed. If you want any of those I'd go quick, they run out fast. I think they are straight run, but you can ask.
I honestly think you could have at least 2 without anyone complaining. I wouldn't put 1 by itself. Everyone says that chickens always need to be in a flock.
Found it
http://library.municode.com/HTML/10218/level2/PTIICOOR_CH6AN.html
Sec. 6-3. - Keeping of fowl.
(a)
It is prohibited and unlawful to keep in the town more than one female fowl, or more than one female water fowl, or any male fowl, or any male water fowl, or any guinea fowl.
(b)
"Fowl"...
Here's the link for Herndon from BackyardChickens. https://www.backyardchickens.com/a/herndon-virginia-chicken-ordinance
I thought I also saw it on a Herndon website... looking for it now.
If you could just make it general Herndon instead of the town of Herndon that would be awesome. Right now for Herndon it says you can have 1 hen, no roosters. But only 1 hen is kind of mean since chickens don't do well by themselves. Also there's a group on Facebook called Chickens for Fairfax...