The interior of the sanctuary is entirely in ornate Greek Revival style. It is spacious, with a capacity to seat 800. The pulpit is framed by a pair of pilasters and a pair of Corinthian columns that rise over 50 feet to a coffered ceiling. Trompe-l'œil behind the pulpit gives the impression of a curved wall. The old-fashioned box pews have Cuban mahogany railings. Many have hand-engraved, 19th-century silver nameplates on the doors, when families "bought" some boxes. Fluted columns support galleries on each side of the sanctuary. The coffered ceiling is supported from a central beam, eliminating the need for supporting columns. It is edged with egg-and-dart molding.