Those arrays should count as they provide service in a space which would otherwise get no service due to being to far from the nearest site or too much congestion on neighboring ones. Since they're capable of functioning independently unlike a repeater they should be counted, if they haven't already. Also there sites you can't readily see so you'll have to add them as well. Not every locale wants a pole sticking out of the ground.
You have to consider factors such as total area of each city/county and potential number of subscribers in each area. I bet in your case, that would probably be around 3-5 counties where T-Mobile USA has a significant investment in a retail stores and network coverage and the remaining counties getting 0-18 (your average), but I think your average of 18 is a bit too high once you factor in rural counties. In a flat world situation T-Mobile USA would rather turn up the Tx/Rx to achieve 3-5 miles than to find space and build more towers.
The size of the county may be of average size, but wireless carriers only do it to grab the most customers.
Vermont, OTOH has practically no real significant investment from T-Mobile USA.
The only thing around is a small 2 year old GSM/EDGE network. No retail/authorized dealers stores or "4G" of any kind.
Gigaom claims there are 68,000 Sprint cell sites. If they want to write a quality article then they shouldn't have too much problems with obtaining basic information.
http://gigaom.com/mobile/sprint-can-...extel-network/
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