What evergreen variety(ies) can you recommend that would grow tall and narrow?
I would like to create a living fence, and would like to use an evergreen variety that does not spread out, but grows tall and narrow or slender.
One very popular choice is Emerald green Arborvitae. There is also a dwarf cultivar of the same. Other choices are sky pencil holly and Jantar cedar, Hikoni cypress and slender Hikoni cypress. I hope one of these meets your needs and soil conditions. If you'll be investing a lot of money in these, spend a few dollars more and get a soil test first. You want your plant to match the soil and you want to amend the soil before planting if you have any deficiencies.