German roaches follow density. The older multi-family housing stock in Newburgh, Middletown and Port Jervis is where most infestations live: two- and three-family frame houses, brick walk-ups and apartments over storefronts, with plumbing chases and wall voids that connect unit to unit. Treat one kitchen and the roaches in the next one simply wait it out.
The county's garden apartment complexes and newer multi-family buildings get them too, along Route 17 and Route 32, in Monroe and Kiryas Joel, and around the Town of Wallkill. In those, roaches often arrive with a move-in: a used appliance, a carton from storage, a secondhand couch. Student rentals near SUNY Orange and Mount Saint Mary College see the same pattern at semester turnover.
In single-family homes in the suburbs and villages, the more common call is oriental or American roaches coming up from a floor drain, a sump pit or a crawlspace. Those are moisture problems first. And in wooded parts of the county, from the Warwick Valley to the Highlands, a lot of "roach sightings" in late spring are actually wood cockroaches wandering in from the woodpile, which is a different issue entirely.