JM
John Mcdonnell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Mcdonnell across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1914), then head of a 8-person household.
Age 26
b. ~1914
Male
Head
Born: Canada English
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | McDonnell |
| Given Name | John O |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Canada English |
| 1935 Residence (City) | Montreal |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Salesman |
| Industry | Dept Store |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 560 |
| Highest Grade | C 2 |
| 1935 Residence | Canada |
| Birth Country | Canada |
| Birthplace (normalized) | canada english |
| Occupation | Salesman |
| Est. Birth Year | ~1914 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Earle Olson | Other | — | 36 | ~1904 |
| John Mcdonnell | Son | — | 2 | ~1938 |
| Eva Olson | Other | — | 35 | ~1905 |
| John Mcdonnell | Head | — | 26 | ~1914 |
| Robert Buckley | Other | — | 15 | ~1925 |
| Richard Buckley | Other | — | 11 | ~1929 |
| Emily Buckley | Daughter | — | 15 | ~1925 |
| Rita Mcdonnell | Spouse | — | 22 | ~1918 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 17
Suffolk, Massachusetts · implied b. ~1913 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Canada English |
| Naturalization Status | Naturalized |
| Year of Immigration | 1914 |
| Father's Birthplace | Canada English |
| Mother's Birthplace | Canada English |
| Occupation | NONE |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Canada |
| Birthplace (normalized) | canada english |
1940
Middlesex-County, Massachusetts
Head, age 26
Middlesex-County, Massachusetts · implied b. ~1914 — 8 household members
| Surname | McDonnell |
| Given Name | John O |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Canada English |
| 1935 Residence (City) | Montreal |
| Naturalization Status | Naturalized |
| Occupation | Salesman |
| Industry | Dept Store |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 560 |
| Highest Grade | C 2 |
| 1935 Residence | Canada |
| Birth Country | Canada |
| Birthplace (normalized) | canada english |
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 Mcdonnell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Mcdonnell
Head · 1940 · age 26 · b. ~1914 · 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
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1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01619-00114)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Samuel Walk | 40 | Head | Clerk | Mass |
| 42 | Rose Walk | 39 | Wife | — | Russia |
| 43 | Alvin B Walk | 18 | Son | — | Mass |
| 44 | Jack H Walk | 18 | Son | — | Mass |
| 45 | Milton J Walk | 16 | Son | — | Mass |
| 46 | Wilfred O Degiacomo | 50 | Head | Machinist | Mass |
| 47 | Blanche E Degiacomo | 46 | Wife | — | Mass |
| 48 | Wilfred Degiacomo | 27 | Son | New Worker | Mass |
| 49 | Ruth M Degiacomo | 18 | Daughter | — | Mass |
| 50 | Dorothy E Degiacomo | 15 | Daughter | — | Mass |
| 51 | Elizabeth O Degiacomo | 6 | Daughter | — | Mass |
| 52 | Harry Berg | 39 | Head | Caretaker | Denmark |
| 53 | Lillian Berg | 38 | Wife | Waitress | Delaware |
| 54 | Harry Berg | 16 | Son | — | Virginia |
| 55 | Alice S Valente | 37 | Head | School Teacher | Boston |
| 56 | Louis F Mock | 27 | Head | Sales Man | Belmont |
| 57 | Virginia W Mock | 24 | Wife | — | Mass |
| 58 | Richard H Hederly | 44 | Head | Engineer | Mass |
| 59 | Gertrude L Hederly | 43 | Wife | — | Mass |
| 60 | Richard L Hederly | 19 | Son | — | Mass |
| 61 | Jack Smith | 25 | Head | Machinist | Canada |
| 62 | Esther Smith | 24 | Wife | Operator | Mass |
| 63 | Walter H Perry | 63 | Head | Business Agent | Maine |
| 64 | Mabel Pearl Perry | 60 | Wife | — | Massachusetts |
| 65 | Paul E Stack | 24 | Head | Salesman | New Jersey |
| 66 | John O Mcdonnell THIS PERSON | 26 | Head | Salesman | Canada English |
| 67 | Rita Mcdonnell | 22 | Wife | — | Massachusetts |
| 68 | John Mcdonnell | 2 | Son | — | Massachusetts |
| 69 | Emily Buckley | 15 | Daughter | — | Mass |
| 70 | Robert Buckley | 15 | Grand Son | — | Mass |
| 71 | Richard Buckley | 11 | Grand Son | — | Mass |
| 72 | Earle Olson | 36 | Lodger | Foreman | Maine |
| 73 | Eva Olson | 35 | Lodger | Inspector | Maine |
| 74 | Charles O Hiker | 33 | Head | Manager | Massachusetts |
| 75 | Balbina Hiker | 26 | Wife | — | New Hampshire |
| 76 | Charles Hiker | 1 | Son | — | Massachusetts |
| 77 | Clyde S Webb | 30 | Head | Helper | Massachusetts |
| 78 | Agnes Webb | 30 | Wife | — | Massachusetts |
| 79 | Patricia Webb | 3 | Daughter | — | Massachusetts |
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)