Census boundary evidence
Thorold — 1851 census geography (ON)
This page identifies a census boundary representation. Source-table records below retain their own reporting-unit identity and geographic qualifications.
- Map snapshot identifier
- ON040002_1851
- Source boundary identifier
- ON040002
- Census vintage
- 1851
- Source label
- Thorold
- Province code
- ON
- District label
- Welland
- Level
- csd
- Representation class
- E93_Presence
Census continuity group: Thorold
TCP UID: ON040002
Census source records
Each link states the assessment that connected the source row to this map. Name candidates remain candidates; no source statistic is silently assigned to the map.
- Thorold — 1851 · 1851_V1T1, row 355 source_identifier_and_context_agree
- Thorold — 1851 · 1851_V1T3, row 354 source_identifier_and_context_agree
- Thorold — 1851 · 1851_V2T6, row 352 source_identifier_and_context_agree
- Thorold — 1851 · 1851_V2T7, row 354 source_identifier_and_context_agree
Boundary intersections across censuses
These are computed polygon intersections in the equal-area CRS ESRI:102001. Fractions describe the area of the earlier and later polygons, respectively. They do not establish historical succession, and population has not been apportioned by area. All positive intersections are retained, including very small contributions.
| Other census representation | Years (earlier → later) | Overlap (m²) | Fraction of earlier area | Fraction of later area | Evidence |
|---|---|---|---|---|---|
| Thorald · 1861 | 1851 → 1861 | 104686968.56757157 | 0.9839465961196318 | 0.9999999999999996 | APPROXIMATELY_EQUAL_EXTENTHistorical succession verified: False |
| Welland, Village · 1861 | 1851 → 1861 | 1708001.424116199 | 0.016053403880368012 | 0.192465825089569 | PARTIAL_OVERLAPHistorical succession verified: False |
Continuity assessments
- Thorold (1851) → Thorald (1861): name_change_requires_review
People and biographical connections
These published connections come from the separate LINCS / Dictionary of Canadian Biography layer. A life event or overlapping lifespan does not establish residence at a census date. The association remains attached to this published page; it is not assigned to every revised census group.
| Name | Lifespan | Connection |
|---|---|---|
| George Keefer | 1773–1858 | died here |
| Jacob Keefer | 1800–1874 | born and died here |
| Samuel Keefer | 1811–1890 | born here |
| Thomas C. Keefer | 1821–1915 | born here |