Chickens have many predators. Here there are rats, cats, dogs, hawks, owls, eagles, weasels, mink, fisher, opossum, skunk, raccoon, fox, coyote, bobcat, bear, and I have a hard time believing you have none of those.
You want to free range. That is fine as long as YOUR birds remain on YOUR property. You have NO rights to their land whatsoever. Your wishes and rights end at the property line. Your neighbors own their property, pay taxes on their property and are free to do with their property as they see fit as long as it doesn't conflict with town regulations. You have no rights to use it. It is YOUR responsibility to keep YOUR livestock on YOUR property. Failing to keep your birds restrained may result in regulations banning all poultry keeping.
Because it is worth repeating (maybe if you read it enough times you'll start to "get" it, OP).