I
- Immigrant place-names: the test on the map Famous Stories & the Record
- Incorporation: three petitions, 1873–1877 The Story of Walkerton
- Incorporation: two plats, three petitions, one town — June 8, 1877 Government
- The Independent line: the town's paper of record, as a source about itself Sources
- The independent thread, and the festival: neither an indie scene nor a festival, founded or lost Film
- The Independent under the Endlys: 1886 into the twentieth century Newspapers & Media
- The Independent-News Co.: the paper as a company, 1938–1978 Newspapers & Media
- The industrial beat, anchored: Walkerton's business census of 1880 The Story of Walkerton
- The industrial buildings, surveyed Architecture
- The industrial fortunes: Shobert's plant, and the 1973 bond Wealth
- Industrial Revolution Section
- Influencers & Digital Creators Section
- The infrastructure winners: no carrier hotel, no data center — the rails were always someone else's Dot-Com Era
- The institution test: no zoo has ever been seated here Zoo
- The institution's course, item by item: ground, society, money, accreditation, eras, animals, losses, crowds, names Zoo
- Institutional and campus tables: the school corporation's table, and a pointer Food & Drink
- Institutions: the register read whole contains neither — printed as this section's finding Black History
- The instruments: the geocoder, the parcel layer, and the discipline of the refused pull Sources
- The interurban test: negative Transportation
- The invention-claims test: no Walkerton Edison Before Walkerton
- Inventors & Inventions Section
- Investigators and organizations: the local record the record supports UFO Sightings