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John Blair — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Blair across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1866), then head of a 3-person household.
Age 74
b. ~1866
Male
Head
Born: New Hampshire
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Blair |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 74 |
| Marital Status | Married |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Melrose City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
| Township / Ward | Melrose City |
| Est. Birth Year | ~1866 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Marion Blair | Daughter | — | 47 | ~1893 |
| John Blair | Head | — | 74 | ~1866 |
| Effie Blair | Spouse | — | 75 | ~1865 |
Census Appearances
1920
Middlesex, Massachusetts
Head, age 54
Middlesex, Massachusetts · implied b. ~1866 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | John H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | New Hampshire |
| Father's Birthplace | Canada |
| Mother's Birthplace | Canada |
| Occupation | Bookkeeper |
| Industry | Produce Co |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1930
Middlesex, Massachusetts
Head, age 64
Middlesex, Massachusetts · implied b. ~1866 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | John H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 64 |
| Marital Status | Married |
| Birthplace | New Hampshire |
| Age at First Marriage | 24 |
| Father's Birthplace | Canada-English |
| Mother's Birthplace | Canada-English |
| Occupation | Bookkeeper |
| Industry | Wholesale market |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 6900 |
| Radio Set | R |
| Veteran | No |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1940
Middlesex-County, Massachusetts
Head, age 74
Middlesex-County, Massachusetts · implied b. ~1866 — 3 household members
| Surname | Blair |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 74 |
| Marital Status | Married |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Melrose City |
| 1935 Residence (County) | Middlesex |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links John Blair across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Blair
Head · 1940 · age 74 · b. ~1866 · Massachusetts
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01613-00575)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Derick V. Wilson | 17 | Son | New Worker | New York |
| 42 | Rear E. Thomas | 73 | Head | Attendant | England |
| 43 | Myrtle V. Thomas | 56 | Wife | Waitress | Mass. |
| 44 | John H. Blair THIS PERSON | 74 | Head | — | New Hampshire |
| 45 | Effie E. Blair | 75 | Wife | — | Maine |
| 46 | Marion L. Blair | 47 | Daughter | Private Secretary | Mass. |
| 47 | Joseph Massie | 43 | Head | — | Italy |
| 48 | Angeline Massie | 40 | Wife | — | Italy |
| 49 | Rose D. Massie | 19 | Daughter | — | Mass. |
| 50 | Joseph R. Massie | 17 | Son | New Worker | Mass. |
| 51 | Martha D. Massie | 2 | Daughter | — | Mass. |
| 52 | Guy H. Appleby | 39 | Head | Proprietor | Penn. |
| 53 | Mary Appleby | 38 | Wife | — | Mass. |
| 54 | Maria Appleby | 5 | Daughter | — | Mass. |
| 55 | William Thomas | 51 | Head | Co-Product Foreman | Scotland |
| 56 | Emily G. Thomas | 48 | Wife | — | Mass. |
| 57 | William Jr. Thomas | 12 | Son | — | Mass. |
| 58 | Jean E. Thomas | 9 | Daughter | — | Mass. |
| 59 | Donald T. Flade | 26 | Head | Store Clerk | Mass. |
| 60 | Margaret R. Flade | 21 | Wife | — | Mass. |
| 61 | Lester Porter | 41 | Head | — | Mass. |
| 62 | Stanley Porter | 20 | Son | — | Mass. |
| 63 | Arthur E. Murphy | 42 | Head | Pipe-Fitter | Mass. |
| 64 | Marion E. Murphy | 36 | Wife | — | Mass. |
| 65 | Arthur E. Jr. Murphy | 16 | Son | New Worker | Mass. |
| 66 | Robert P. Murphy | 15 | Son | — | Mass. |
| 67 | John Pinson | 83 | Head | — | Irish Free State |
| 68 | Nina L. Pinson | 50 | Daughter | Milliner | Mass. |
| 69 | Mary C. Pinson | 45 | Daughter | — | Mass. |
| 70 | John T. Pinson | 33 | Son | Clerk | Rhode Island |
| 71 | Parker M. Tiffard | 74 | Head | Tavern Owner | Mass. |
| 72 | Gertrude E. Tiffard | 69 | Wife | — | Mass. |
| 73 | James B. Heaton | 63 | Head | Chief Of Police | Mass. |
| 74 | Janet W. Heaton | 63 | Wife | — | Maine |
| 75 | James B. Jr. Heaton | 25 | Son | Mechanical Eng. Inspector | Mass. |
| 76 | Victor Donald Heaton | 9 | Grandson | — | Mass. |
| 77 | Donald Vinton | 49 | Son | Golf-Pro | Mass. |
| 78 | Thomas B. Powers | 29 | Head | Store Manager | Mass. |
| 79 | Catherine M. Powers | 26 | Wife | — | Mass. |
| 80 | Thomas B. Jr. Powers | 6 | Son | — | Mass. |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)