ParenthoodNJ.com

YMCA - find various YMCA swim programs
Into the Swim - several locations including Deptford, East Brunswick, Edison, Somerset, Springfield, Voorhees, Woodbridge; classes for infants & older
Making Waves Swim School - several locations in Bergen, Burlington, Mercer, Middlesex, Monmouth, Morris, Somerset counties; classes for kids 3 years & older
Take Me to the Water - various NJ locations for kids 6 months & older

Milton & Betty Katz JCC of Atlantic County (Margate) - classes starting as young as 4 months

Ironwood Outdoor Center (Lumberton) - classes start as young as 8 months
Jersey Wahoos Swim Club (Mt Laurel) - classes 6 months & up

Sky Club Fitness & Spa (Hoboken) - classes 6 months & older

Rutgers University (New Brunswick) - classes for kids 5-12
The Club at Ricochet (South Plainfield) - swim classes 6 months & up

Silton Swim School (Manasquan) - classes for 3 years & older

Kim Swim (Denville) - classes 6 months & older
NJ Swim (Florham Park) - classes for 6 months & up

Elite Gymnastics (Hawthorne) - classes for 4 months & up

Shimon & Sara Birnbaum Jewish Community Center (Bridgewater) - swim lessons for 6 months & older
Hillsborough Raqquet Club (Hillsborough) - classes 6 months & up
Somerset Pool & Fitness Club (Somerset) - classes 6 months & up