Tim, I'm assuming you've already been to the Barnes Foundation in the Philly 'burbs. It has 69 paintings by Cezanne, not to mention lots of others:
The Barnes Foundation houses one of the finest collections of French Impressionist, Post-Impressionist, and early Modern paintings in the world, including an extraordinary number of masterpieces by Pierre-Auguste Renoir (181), Paul Cézanne (69), and Henri Matisse (59). The collection also includes important works by Pablo Picasso (46), Chaim Soutine (21), Henri Rousseau (18), Amedeo Modigliani (16), Edgar Degas (11), Vincent van Gogh (7), Georges Seurat (6), Edouard Manet (4), and Claude Monet (4).
Although renowned for its late 19th- and early 20th-century European paintings, the Foundation's collection also includes important examples of American paintings and works on paper, including works by Charles Demuth, William Glackens, and Maurice and Charles Prendergast; African sculpture; Native American ceramics, jewelry, and textiles; Asian paintings, prints, and sculptures; Medieval manuscripts and sculptures; Old Master paintings, including works by El Greco, Peter Paul Rubens, and Titian; ancient Egyptian, Greek, and Roman art; and American and European decorative arts and metalwork.