Is Ocean Isle Beach Part of the Outer Banks?

No. Ocean Isle Beach, North Carolina is not part of the Outer Banks.

Geographic Distinction

Outer Banks (OBX): ~200-mile chain of barrier islands separating Pamlico/Albemarle Sounds from Atlantic. Stretches from Virginia Border (Carova) to Ocracoke Inlet. Major towns: Corolla, Duck, Kitty Hawk, Nags Head, Hatteras, Ocracoke.
Ocean Isle Beach: Located on the mainland-attached barrier island (Holden Beach Island) in Brunswick County, ~150 miles SW of Cape Hatteras (OBX southern tip). Nearby: Sunset Beach, Holden Beach, Oak Island.

Feature	Outer Banks	Ocean Isle Area
Geology	True barrier islands (migrating)	Stabilized barrier / mainland fringe
Access	Bridges/ferries only	High-rise bridges (causeways)
Development	Low-density, no high-rises	Mix of single-family, condos, commercial
Vibe	Remote, natural, historic	Family resort, golf, Intracoastal access

Both are wonderful NC beaches, but they are distinct regions separated by Onslow Bay and the Cape Fear River delta.

South Pacific