There are 12 unique ditch names beginning with N:

Neels Run (Perry) Ditch	Neels Run (Perry) Extension Ditch	Neels Run Ditch	Neolp Ditch	New California Hills/Woods Ditch	Newhouse Ditch	Newton Ditch
Nichol Joint Ditch	Nicol Ditch	Norris Ditch	North Franklin Ditch	Noteman Ditch