Connecticut Cities:
- Noank
- Noble
- Norfolk
- Noroton
- Noroton Heights
- North Ashford
- North Bloomfield
- North Branford
- North Canton
- North Cornwall
- North Franklin (lebanon (sta.))
- North Glenwood
- North Granby
- North Grosvenor Dale
- North Guilford
- North Haven
- North Kent
- North Lyme
- North Mianus
- North Sterling
- North Stonington
- North Thompsonville
- North Westchester
- North Windham
- North Woodbury
- North Woodstock
- Northfield
- Northford
- Northville
- Northwest Harwinton
- Norwalk
- Norwich
- Norwichtown
- Nut Plains
- Oakdale
- Oakdale Manor
- Oakland Gardens
- Oakville
- Occum
- Old Greenwich
- Old Lyme
- Old Lyme Shores
- Old Mystic
- Old State House
- Oneco
- Orange
- Orange Air National Guard Communication Station
- Orcutts
- Oronoque
- Oswegatchie
- Oswegatchie Hills
- Owenoke
- Ox Hill
- Oxford (oxford Center)
- Oxoboxo Lake
- Pachaug
- Packerville
- Palestine
- Palmertown
- Paradise Green
- Parcel Post
- Paucatuck Eastern Pequot Indian Reservation
- Pawcatuck
- Pemberwick
- Pequabuck (terryville (sta.))
- Perkins Corner
- Phoenixville
- Pine Bridge
- Pine Grove
- Pine Meadow
- Pine Orchard
- Pine Rock Park
- Plainfield
- Plainfield Village
- Plainville
- Plantsville
- Plaza
- Pleasant Acres
- Pleasant Valley
- Pleasure Beach
- Plymouth
- Point Beach
- Point O'woods
- Pomfret
- Pomfret Center
- Pomfret Landing
- Pomperaug
- Pond Point
- Ponset
- Pootatuck Park
- Poquetanuck