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John Robertson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Robertson across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1867), then head of a 4-person household.
Age 73
b. ~1867
Male
Head
Born: Sweden
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Robertson |
| Given Name | John R. G. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 73 |
| Marital Status | Widowed |
| Birthplace | Sweden |
| 1935 Residence (City) | SOMERVILLE |
| 1935 Residence (County) | MIDDLESEX |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Clerk Repairer |
| Industry | Clocks |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 320 |
| Highest Grade | C-6 |
| 1935 Residence | Same place |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
| Occupation | Clerk Repairer |
| Township / Ward | Somerville |
| Est. Birth Year | ~1867 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Ruth Robertson | Daughter | — | 31 | ~1909 |
| John Robertson | Head | — | 73 | ~1867 |
| Ida Hielmquist | Other | — | 62 | ~1878 |
| Herbert Robertson | Son | — | 34 | ~1906 |
Census Appearances
1920
Middlesex, Massachusetts
Head, age 52
Middlesex, Massachusetts · implied b. ~1868 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Robertson |
| Given Name | John R |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Sweden |
| Year of Immigration | 1890 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Watchmaker |
| Industry | Jewelry Store |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | R |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1930
Middlesex, Massachusetts
Head, age 63
Middlesex, Massachusetts · implied b. ~1867 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Robertson |
| Given Name | John R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Widowed |
| Birthplace | Sweden |
| Naturalization Status | Naturalized |
| Year of Immigration | 1891 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Clock Repairer |
| Industry | Jewelry Shop |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | O |
| Home Value / Rent | 6000 |
| Radio Set | R |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1940
Middlesex-County, Massachusetts
Head, age 73
Middlesex-County, Massachusetts · implied b. ~1867 — 4 household members
| Surname | Robertson |
| Given Name | John R. G. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 73 |
| Marital Status | Widowed |
| Birthplace | Sweden |
| 1935 Residence (City) | SOMERVILLE |
| 1935 Residence (County) | MIDDLESEX |
| Naturalization Status | Naturalized |
| Occupation | Clerk Repairer |
| Industry | Clocks |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 320 |
| Highest Grade | C-6 |
| 1935 Residence | Same place |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
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 Robertson 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 Robertson
Head · 1940 · age 73 · b. ~1867 · 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-t0627-01705-00185)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | George H. La Freniere | 54 | Head | Laborer | Massachusetts |
| 42 | Lottie La Freniere | 47 | Wife | — | Massachusetts |
| 43 | George Jr. La Freniere | 21 | Son | — | Massachusetts |
| 44 | Marie La Freniere | 19 | Daughter | — | Massachusetts |
| 45 | Helen Ten Eyck | 50 | Head | Ironer | Massachusetts |
| 46 | John R. G. Robertson THIS PERSON | 73 | Head | Clerk Repairer | Sweden |
| 47 | Herbert E. Robertson | 34 | Son | Engineer | Massachusetts |
| 48 | Ruth E. Robertson | 31 | Daughter | Bank Clerk | Massachusetts |
| 49 | Ida A. Hielmquist | 62 | Sister | Housekeeper | Sweden |
| 50 | Alexander Thomson | 56 | Head | — | Scotland |
| 51 | Elizabeth A. Thomson | 54 | Daughter | Nurse | Scotland |
| 52 | Sarah M. Thomson | 55 | Daughter | — | Scotland |
| 53 | Janet T. Wiley | 62 | Daughter | Photograph | Scotland |
| 54 | Alexander Plumer | 27 | Lodger | Bookkeeper | Massachusetts |
| 55 | Jessie P. De Marco | 32 | Head | Chauffeur | Massachusetts |
| 56 | Carrie B. De Marco | 27 | Wife | — | Massachusetts |
| 57 | Thomas De Marco | 11 | Son | — | Massachusetts |
| 58 | Winifred E. De Marco | 9 | Daughter | — | Massachusetts |
| 59 | Robert M. Burke | 42 | Head | Fireman | Massachusetts |
| 60 | Robert W. Burke | 18 | Son | — | Massachusetts |
| 61 | Henry W. Burke | 13 | Son | — | Massachusetts |
| 62 | Marie B. Burke | 25 | Niece | — | Massachusetts |
| 63 | John W. Casey | 30 | Head | Salesman | Massachusetts |
| 64 | Thelma G. Casey | 35 | Wife | — | Massachusetts |
| 65 | James R. Jr. Hart | 18 | Step-son | Counterman | Massachusetts |
| 66 | Gladys Madruga | 38 | Head | Medical Dispatcher | Massachusetts |
| 67 | Patricia Madruga | 13 | Daughter | — | Massachusetts |
| 68 | Marion Madruga | 10 | Daughter | — | Massachusetts |
| 69 | William Langlois | 56 | Head | Sheetmetal | New Hampshire |
| 70 | Grace Langlois | 50 | Wife | — | Massachusetts |
| 71 | Erville G. Tottier | 33 | Head | Machinist | Canada-English |
| 72 | Mary A. Tottier | 44 | Wife | — | Canada-English |
| 73 | John F. Edgeworth | 30 | Head | Machinist | Arkansas |
| 74 | Florence Edgeworth | 36 | Wife | — | Massachusetts |
| 75 | Sydney W. Fullerton | 59 | Head | Plumber | Canada-English |
| 76 | Maud A. Fullerton | 58 | Wife | — | England |
| 77 | William Whiting | 35 | Head | Mechanic | Scotland |
| 78 | Ruth Whiting | 34 | Wife | Packer | Massachusetts |
| 79 | John S. Edwards | 60 | Head | Elevator | Canada-English |
| 80 | Margaret Edwards | 59 | Wife | — | New York |
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)