You should probably check your town in Open streen maps, it's probably not marked properly. As long as there are some spawns, if you mark the town's parks, lakes, etc correctly you should get (at some point) nests in there.
Please be responsible with your editing, don't put anything that's not actually there!!
The current nest migration has been a great one for me. One park changed from a Growlithe nest to currently Cyndaquil. The other park that I frequent often is a Teddiursa nest right now.
I've been grinding at both parks switching it up every other day. Catching and accumulating candy for when trading comes.