- I. Silver & Bros.1
- Ide & Haverstick Company1
- Iler & Co.2
- Illinois Sewing Machine Co.1
- Imperial Paste Mfg. and Merchantile Company1
- Imperial Woolen Company1
- Independent Baking Company1
- Indian Harbor Hotel1
- Indianapolis Saddlery Co.1
- International Handkerchief Mfg. Co.1
- International Stock Food Company2
- International Tailoring Co.3
- Irving & Casson1
- Isaac A. Isaacs' Union Hall1
- Isaac D. Dana1
- Isaac N. Tucker1
- Isaac Staples1
- Island City Bank1
- Iver Johnson Sporting Goods Co.1
- J. & J. Kaufman1
- J. Allen Smith & Company1
- J. B. Barnaby Co.1
- J. B. Camors & Company1
- J. B. King & Co.1
- J. B. Plummer & Co.1
- J. B. Shannon & Sons1
- J. Bolgiano & Son1
- J. C. Johnson & Co.2
- J. Dobbins1
- J. E. Lonergan & Co.1
- J. E. Oppenheimer1
- J. Eavenson & Sons2
- J. F. Bumstead & Co.1
- J. F. Dietz & Co.1
- J. F. Ryder's Art Galleries1
- J. Fortune & Co.1
- J. G. Smith & Sons1
- J. Griffiths1
- J. H. C. Petersen's Sons1
- J. H. Koppelman & Co.1
- J. H. Newbauer & Co.1
- J. Hartigan1
- J. J. Beals & Co.1
- J. K. & B. Sears & Co.1
- J. Klee & Brother1
- J. Knabb & Co.1
- J. M. Porter1
- J. M. Quinby & Co.1
- J. M. Swift & Co.1
- J. Maury Dove1
- J. P. Donaldson Co.1
- J. P. Huntoon3
- J. R. Bigelow & Co.1
- J. R. Booth1
- J. R. Watkins Company1
- J. R. Westlake & Bro.1
- J. Redcliff1
- J. S. Phelps & Co.1
- J. T. & A. Hamilton2
- J. V. Fletcher1