"Hi,
Thanks for writing. There's not an overabundance of tall, narrow evergreens for Zone 6 where you live, but some top choices that come to mind include: Columnar white pine (Pinus strobus 'Fastigiata'), Skyrocket juniper (Juniperus virginia 'Skyrocket'), Hicks yew (Taxus 'Hicksii'), Moonglow juniper (Juniperus scropulorum 'Moonglow'), and columnar blue spruce (Picea pungens 'Iseli Foxtail').
Good luck!
---Justin, Senior Garden Editor, BHG.com"