- I. V. Market - [fruit market] 3735 Montgomery Road
- Ideal Linoleum - [flooring] 4548 Montgomery Road
- Ideal Swimming Pool - [outdoor swimming pool] south side of Washington Avenue, west of Lafayette (location is now at the north end of Surrey Square, and that part of Washington Avenue is gone)
- Dione Ideson - [dance school] w.s. Elsmere Av., between Cameron and Ashland Avenues.
- H. Ihlendorf - [livery stable] n.e.c Montgomery Road & Monroe Avenue at 4912 Montgomery Road
- H. Ihlendorf Company - [ambulance service] Montgomery Road & Monroe Av.
- H. J. Ihlendorf and Sons - [funeral director] 4400 Montgomery Road
- Imperial Sandwich Shop - [restaurant] 3753 Montgomery Road and 4729 Smith Rd.
- Indian Mound Cafe - [cafe/restaurant] 5224 Montgomery Road; east side of Montgomery Road, south of Indian Mound Avenue
- Indian Mound Shoe Repair Shop - [shoe repair] 5224 Montgomery Road
- Innovative Ink - [silk screening] 5324 Carthage Avenue
- Instananeous Glue Converters - [ ] 3752 Montgomery Road
- International Union of Electrical, Radio & Machinery Workers Dist. 7 (CIO) - [union] 4222 Montgomery Road
- Interurban Electric Light & Power Company - [electric power and rail company] s.e. corner of Harris & Forest Avenues
- Julia A. Irvin - [practical nurse] 2633 Ida Avenue
- Mrs. A. F. Ismael - [ice cream & confections] Montgomery and Elm (est. pre-1900)
- Ralf (sic - Ralph?) Itschner - [groceries/meats/fruit] Montgomery and Maple
- Ivanhoe Exchange - [whiskey and cigar store] Montgomery Road and Williams Avenue, in Ivanhoe, Ohio, on east side Main, south of Williams, A. Theobald, prop. (est. pre-1900)
- John F. Ivory Storage Co., Inc. - [storage] 3846 Montgomery Road
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