- Carnegie, Louise Whitfield, 1857-19461
- Carneiro Realty Corp.1
- Carner, Ingram S.1
- Carner, Jack1
- Carner, Moe6
- Carner, William6
- Carol Construction Co., Inc.1
- Carol Enterprises, Inc.1
- Carol Management Corp.22
- Carol Sales Corp.1
- Carpenter, J.E.R.4
- Carpenter-Boulevard Corp.1
- Carreau, Lewis1
- Carrow, Milton M.2
- Carson and Lundin4
- Carstens, Linnekin, and Wilson, Inc.1
- Carvel Hall, Inc.1
- Casale, James E.2
- Case Builders, Inc.1
- Cassis Construction Corp.2
- Castle Gardens, Inc.1
- Castle Villiage Inc.4
- Caterina Building Corp.1
- Caton Apartments, Inc.1
- Caton Builders, Inc.2
- Caton Holding Corp.1
- Caton Park Estates, Inc.1
- Caughey and Evans1
- Caughey, A. Rollin9
- Caughey, Rollin A.8
- Cauldwell Terrace Construction Corp.1
- Cauldwell-Wingate Co., Inc.1
- Cedarhurst Park Apartments, Inc.1
- Central Herrick Corp.1
- Central Management Co.2
- Central NBP Midlawn1
- Centre City Org.1
- Chain Building Corp.1
- Charin, Ira1
- Charles F. Noyes Co., Inc.4
- Charles H. Greenthal & Co., Inc.1
- Charles H. Greenthal and Co., Inc.70
- Charles Kreymborg and Son1
- Charles Luckman Associates1
- Charles Management Co.2
- Chatham-Phenix Building1
- Chattilon, E.H.1
- Chelsea Land Corp.1
- Chelsea Management Corp.4
- Chen, Paul K.Y.1
- Chester Lane, Inc.1
- Churchill Land Corp.1
- Churchill, Harry S.1
- Chutick, J.2
- Ciluzzi Construction Corp.1
- Citizens Savings Bank1
- Citizens for Constitutional Rights Committee1
- Citizens' Councils of America1
- City Center Organization1
- City Investing Co.1