The census entries for surnames beginning with I:
| Surname | Given Name | Age | Birth Place | Precinct | Page/Line | ED | Notes |
| Ide | Della P. | 21 | IA | Connell | 7A/14 | 3-60 | |
| Ide | Harvey V. | 1 1/4 | WA | Connell | 7A/15 | 3-60 | |
| Ide | John H. | 23 | MN | Connell | 7A/13 | 3-60 | |
| Imatsu | Otoiche | 31 | Japan | Pasco | 23A/13 | 3-64 | |
| Imilson | Issaac | 33 | Finland | Connell | 15A/23 | 3-60 | Names unclear |
| Inada | Jiagaturo | 29 | Japan | Pasco | 23B/53 | 3-64 | |
| Insee | William E. | 22 | KS | LeRoy | 4A/22 | 3-62 | Surname unclear |
| Inyert | C. H. | 19 | WA | Eltopia | 3A/24 | 3-63 | |
| Irby | Claude C. | 21 | MO | Pasco | 18B/94 | 3-64 | |
| Ireland | Clara | 24 | OR | LeRoy | 4A/21 | 3-62 | |
| Isley | Bertha | 21 | OR | Pasco | 20B/71 | 3-64 | |
| Iversen | Harold E. | 19 | WA | Pasco | 21B/83 | 3-64 | |
| Iverson | Peter L. | 43 | Norway | Pasco | 2A/30 | 3-64 | |
| Ivessent | Iver H. | 30 | IA | Pasco | 24A/6 | 3-64 |
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