D
- The daguerreian decade, person by person — the floor's persons are Fort Wayne's; this county's decade is unnamed in the record reached Photographers
- The dairy order: herds, a farmer-run creamery, and the 300-cow present Farms & Agriculture
- Dance whole: the Patchwork Dance Company — founded 1977, seated in Osceola at 686 Apple Road, now on Douglas Road Arts
- The dance-orchestra era Music
- The dated lodge census read as orders: Howard's 1907 roster, parsed Lodges & Fraternal Orders
- A dated mileage ledger for the network Bike Trails
- Dead ground rebuilt: Scottsdale to Erskine Village Malls & Shopping
- The dealer record to the present row: one implement line in 1916, and no tractor dealer seated here since Tractors
- Dealerships Section
- Dealerships: the horse-trade ground, a tested franchise negative, and the McKinley used-car row Businesses
- The decoration test: no Medal of Honor — one Air Medal, proved Wars & Military Service
- The deeds in kind: a third of an acre, whole Major Donations
- The defense city: an overview, then firm by firm — and Osceola's own defense-industry share, tested negative Military
- Defining players and rosters: the players stand in People; no team roster stands anywhere — none here Team Histories
- The demolished-building test: the 1914 schoolhouse carries no ghost Famous Stories & the Record
- The departed predators: wolves, panthers and bears, with the last records sized Wildlife
- Departments and firsts: the district's texture at pointer, no Osceola first found, and a county-wide turn that never came Arts
- The departure told whole: St. Joseph's leaves South Bend, 2008–2009 Health & Care
- The depot trade: grain in William C. Smith's hands, livestock in A. Newsbaum's — and no elevator in the record Businesses
- The designation record counted, at a date Historic Preservation
- The designer-teacher: art teaching in the township's schools, at the strength the record gives — NAMED GAP Arts
- Development and the Built City Now (L15·6) Osceola Today
- The development corporation: the county's century-outlasting corporation, and this ground's 1953 line Foundations & Nonprofits
- DF-11: the Gold Star figure of 109 — a recount attempted, and closed as a named gap Wars & Military Service
- DF-21 — Fern Hunsberger Park: the town park the Parks leg never carried Hiking Trails
- The Digitized Shelves (L16·7) Sources
- The diocese course whole, at boundary: Fort Wayne–South Bend, 1857 to November 2026 Churches & Religion
- The directors: the district's line to its current holder, because its director is Osceola's librarian in law Arts
- The directory houses: the long tail, recovered — and what it holds for Osceola Hotels & Motels
- The dirt roster, park by park — separated from the paved system that never arrives Hiking Trails
- The disability charities: LOGAN at boundary, and the register's own Osceola lines at article size Charities
- The disaster set at building granularity Wars & Military Service
- The distillers as a searched negative, with its date span printed Wineries & Distilleries
- The distinctions: spree, mass, and contract are not series — and this ground has none of them either Crime & Public Safety
- Distribution counted as an export trade — sized, and bounded Exports
- The documentary test and the production company: local negative, the university's arm at boundary Film
- The documented case, whole — and it is South Bend's: the Powell family and the Norris seizure, 1847–1851 Underground Railroad
- The documented case, whole: the Powells, seized in Michigan, heard in South Bend — and no Penn seat in it Underground Railroad
- Don M. Newman — Sagamore of the Wabash (twice), and the state's Outstanding Pharmacist, 1970 Awards & Honors
- Don M. Newman: the pharmacist of Osceola ground who sat under the Secretary — DF-1 resolved Notable People
- Dot-Com Era Section
- The doubling, and the suburb, 1940–2020 The Story of Osceola
- The downtown social and athletic clubs, tested: a class this town never had the downtown for Private Clubs
- The downtown unmade: the paper mall and the cleared hole Malls & Shopping
- Dr. Stephen J. Batchelder — the village's physician, 1869–1879 Health & Care
- Dress on Show Fashion
- The drift and the lobes Before Osceola
- The drift and the lobes: the carried ground at its thickness, and the three lobes that met here Before Osceola
- The drive-in at its true frame: no screen ever stood in this town, printed as that fact Theaters
- The drive-in test: a national magazine names a Starlite here; no local record confirms it — Named Gap, Conflict Flagged Loudly Kids & Family Entertainment
- The drone era tested as its own period: winter 2024–25 UFO Sightings
- The drug era in the federal record Crime & Public Safety
- The dry years in Penn Township Crime & Public Safety
- Dynasty numbers as conventions: the counting shown Famous Stories & the Record