Census boundary evidence
Thunder Bay — 1921 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
- CD_ON_Thunder_Bay_1921
- Source boundary identifier
- CD_ON_Thunder_Bay
- Census vintage
- 1921
- Source label
- Thunder Bay
- Province code
- ON
- District label
- Level
- cd
- Representation class
- E93_Presence
Census continuity group: Thunder Bay
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.
- Thunder Bay — 1921 · 1921_V1T16, row 3525 unique_contextual_name_candidate
- Thunder Bay — 1921 · 1921_V1T27, row 3200 unique_contextual_name_candidate
- Thunder Bay — 1921 · 1921_V1T38, row 3200 unique_contextual_name_candidate
- Thunder Bay — 1921 · 1921_V3T3, row 154 unique_contextual_name_candidate
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 |
|---|---|---|---|---|---|
| Northwest Territories · 1911 | 1911 → 1921 | 196205089638.1979 | 0.03845999154834201 | 0.5925595903813883 | PARTIAL_OVERLAPHistorical succession verified: False |
| Algoma E · 1911 | 1911 → 1921 | 16074337890.272068 | 0.08635604192731637 | 0.04854615694972922 | PARTIAL_OVERLAPHistorical succession verified: False |
| Algoma W-O · 1911 | 1911 → 1921 | 4.81574786003636 | 1.0235983825120833e-10 | 1.4544054818278477e-11 | PARTIAL_OVERLAPHistorical succession verified: False |
| Thunder Bay & Rainy River · 1911 | 1911 → 1921 | 118835101244.87697 | 0.6570285697721536 | 0.35889425216462933 | PARTIAL_OVERLAPHistorical succession verified: False |
Area separations
| Earlier area | Continuing area | Separate area | Retained fraction | Separated fraction | Comparison status |
|---|---|---|---|---|---|
| Northwest Territories · 1911 | Northwest Territories · 1921 | Thunder Bay | 0.6632302899941904 | 0.038459991548342 | later_totals_require_geographic_reconciliation |