- Jefferson School
- 48 Washington Rd, Jefferson, ME
- Jefferson Town House
- 58 Washington Road, Jefferson, Maine
- Jefferson Village School
- 48 Washington Road, Jefferson, Maine
- Jewell Lodge at Wavus
- 88 Wavus Point Road, Jefferson, Maine
- Johnson's Sporting Goods
- 51 Park St., Rockland, Maine, 04841
- Joseph A. Fiore Art Center
- 152 Punk Point Rd, Jefferson, Maine, 04348
- Juniper Hill School
- 180 Golden Ridge Road, Alna, ME, 04535
- Kefauver Studio and Gallery
- 144 Bristol Road, Damariscotta, ME, 04539
- Keller Williams
- 65 Main Street, Damariscotta
- Kennedy Learning Center at Camp Kieve
- West Neck Road, Nobleboro, Maine, 04555