I'm not so sure why anyone would care, but I use Dial-Global for much of my programming, and used to use ABC before it went the way of ABC/Citadel/Cumulus. I will venture to say that MOST radio stations in the United States use either voice-tracking or network (satellite) for some of their programming.
This runs the risk of going off-topic, but:
In the olden days, most radio stations were network affiliates. With the advent of television, this all changed. In this century, with the proliferation of radio signals, the smaller market stations, many of whom struggled even in the AM radio days, find it even more necessary to use voice-tracking (which wasn't available in the olden days), or networks for some or all of their programming.
Unfortunately, the larger market stations also do it, but only because technology permits it.
I fondly (not) remember the days that major market radio stations used automation of some sort. In Seattle, in the 70's, several FM stations used tape automation. Today, their revenues should be sufficient for a major market station to be live 24/7. Such is not the case. Several years ago, the leading country station in the Northwest was using a syndicated network show at least overnights. And in the early 90's, a leading station in San Francisco was utilizing a CD-based automation for 1/3 of its programming.
Today, every major group uses both voice-tracking and syndication across their numerous stations.
Interestingly, today when you hear a syndicated network format, some day parts it may even be automated (voice-track).
The only format that has not yet been perfected with voice-tracking is talk radio. And with ever-improving text-to-voice, watch out.