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...that make fine hedges in the height range you specify. Most are evergreen and thus provide year-round privacy. A number of yews will also do well in your climate zone.
You need to be realistic in your expectations of a hedging shrub, though. In general, the "fast growers" are short-lived and have a tendency to legginess (the same problem you had with your hemlock.) Shrubs that form thick, long-lived, abundant hedges requiring little maintenance also tend to be slow-growing.
Your best bet is probably to go to a LOCAL nursery (not a local branch of some big chain) and discuss your needs with them. They'll have a better handle on what thrives in your area, what's readily available and inexpensive, etc. I give that (go to your local nursery) advice a LOT here, but by golly, it's true and I learned it the hard way, by making repeated mistakes and getting helped out with the recovery by local nurseries.
encouragingly, Bright
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