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John Mckenzie — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Mckenzie across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 11-person household.
Age 23
b. ~1917
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | McKenzie |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Waltham |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Priv. secretary |
| Industry | Public Works |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 360 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Priv. Secretary |
| Township / Ward | Waltham |
| Est. Birth Year | ~1917 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Mckenzie | Daughter | — | 14 | ~1926 |
| John Mckenzie | Son | — | 23 | ~1917 |
| Gertrude Mckenzie | Daughter | — | 27 | ~1913 |
| Isabel Mckenzie | Daughter | — | 32 | ~1908 |
| Margaret Mckenzie | Daughter | — | 21 | ~1919 |
| Martin Keane | Other | — | 64 | ~1876 |
| Mary Mckenzie | Daughter | — | 34 | ~1906 |
| Charles Mckenzie | Son | — | 16 | ~1924 |
| Alice Mckenzie | Daughter | — | 26 | ~1914 |
| John Mckenzie | Head | — | 58 | ~1882 |
| Delia Mckenzie | Spouse | — | 60 | ~1880 |
Census Appearances
1930
Norfolk, Massachusetts
Son, age 13
Norfolk, Massachusetts · implied b. ~1917 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mackenzie |
| Given Name | John D Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 23
Middlesex-County, Massachusetts · implied b. ~1917 — 11 household members
| Surname | McKenzie |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Waltham |
| 1935 Residence (County) | Middlesex |
| Occupation | Priv. secretary |
| Industry | Public Works |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 360 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Mckenzie across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mckenzie
Son · 1940 · age 23 · b. ~1917 · Massachusetts
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Sibling
Mary Mckenzie
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gertrude Mckenzie
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Mckenzie
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Isabel Mckenzie
Sibling · 1940 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mckenzie
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Mckenzie
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Mckenzie
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
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
38 people indexed on this census page (nara:1940:m-t0627-01619-00833)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Joseph P. Mccarthy | 32 | Son | Bus Driver | Massachusetts |
| 42 | Mary A. Mccressney | 74 | Head | — | Canada Eng |
| 43 | Mildred E. Watts | 44 | Daughter | Waitress | Massachusetts |
| 44 | John P. Watts | 44 | Son-in-law | Chauffeur | Scotland |
| 47 | John J. Mckenzie | 58 | Head | Die Maker | Massachusetts |
| 48 | Delia Mckenzie | 60 | Wife | — | Eire |
| 49 | Mary E. Mckenzie | 34 | Daughter | Priv. Secretary | Massachusetts |
| 50 | Isabel A. Mckenzie | 32 | Daughter | Saleswoman | Massachusetts |
| 51 | Gertrude M. Mckenzie | 27 | Daughter | Priv. Secretary | Massachusetts |
| 52 | Alice F. Mckenzie | 26 | Daughter | Clerical | Massachusetts |
| 53 | John J. Mckenzie THIS PERSON | 23 | Son | Priv. Secretary | Massachusetts |
| 54 | Margaret T. Mckenzie | 21 | Daughter | Plumber | Massachusetts |
| 55 | Charles P. Mckenzie | 16 | Son | — | Massachusetts |
| 56 | Dorothy P. Mckenzie | 14 | Daughter | — | Massachusetts |
| 57 | Martin Keane | 64 | Brother-in-law | Bus Driver | Eire |
| 58 | Hugh C. Demont | 26 | Head | Manager | Canada |
| 59 | Mary C. Demont | 21 | Wife | Screw Machine Operator | Massachusetts |
| 60 | John A. Macleod | 45 | Head | Automobile Mechanic | Massachusetts |
| 61 | Bessie Macleod | 44 | Wife | Parts Assem. | Canada |
| 62 | Walter F. Homer | 36 | Head | Book Binder | New Hampshire |
| 63 | Ruth E. Homer | 28 | Wife | Shipper | Massachusetts |
| 64 | Frank V. Maguire | 52 | Head | Prod. Manager | Massachusetts |
| 65 | Marie C. Maguire | 35 | Wife | — | Massachusetts |
| 66 | Henry F. Smith | 71 | Head | House Painter | Canada Eng |
| 67 | Josephine H. Smith | 57 | Wife | — | Canada Eng |
| 68 | Ellen R. Forbush | 81 | Head | — | Massachusetts |
| 69 | L. Mabel Forbush | 59 | Daughter | School Principal | Massachusetts |
| 70 | Robert C. Thompson | 60 | Head | Machine Repair | Pennsylvania |
| 71 | Elva P. Thompson | 54 | Wife | — | Canada Eng |
| 72 | William Lilla G. Rodger | 64 | Lodger | Inspector | Vermont |
| 73 | Margaret Campbell | 59 | Lodger | Folder | Massachusetts |
| 74 | Rose E. Mccowie | 48 | Head | Inspector | Scotland |
| 75 | Muriel Mccowie | 22 | Daughter | Inspector | Massachusetts |
| 76 | Kenneth Mccowie | 20 | Son | Machine Operator | Massachusetts |
| 77 | Robert Mccowie | 10 | Son | — | Massachusetts |
| 78 | Azime F. Lablanc | 60 | Head | Saw Master | Canada F. |
| 79 | Emelie Lablanc | 58 | Wife | — | Canada F. |
| 80 | Edward P. Lablanc | 27 | Son | Salesman | 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)