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John Smith — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Smith across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Robert & Sarah — first a son (b.~1910), then head of a 12-person household.
Age 30
b. ~1910
Male
Son
Born: Scotland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Smith |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Scotland |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Truck Driver |
| Industry | Transportation |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 1190 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Truck Driver |
| Township / Ward | Medford City |
| Est. Birth Year | ~1910 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Margaret Smith | Daughter | — | 23 | ~1917 |
| Robert Smith | Head | — | 58 | ~1882 |
| Gordon Smith | Son | — | 13 | ~1927 |
| James Smith | Son | — | 19 | ~1921 |
| Kenneth Smith | Son | — | 15 | ~1925 |
| William Smith | Son | — | 33 | ~1907 |
| Andrew Smith | Son | — | 21 | ~1919 |
| George Smith | Son | — | 25 | ~1915 |
| Roland Smith | Son | — | 3 | ~1937 |
| Douglas Smith | Son | — | 16 | ~1924 |
| John Smith | Son | — | 30 | ~1910 |
| Sarah Smith | Spouse | — | 54 | ~1886 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 10
Middlesex, Massachusetts · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Scotland |
| Year of Immigration | 1910 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1930
Middlesex, Massachusetts
Son, age 20
Middlesex, Massachusetts · implied b. ~1910 — 13 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1910 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Middlesex-County, Massachusetts
Son, age 30
Middlesex-County, Massachusetts · implied b. ~1910 — 12 household members
| Surname | Smith |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Scotland |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Occupation | Truck Driver |
| Industry | Transportation |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 1190 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Smith across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Robert Smith (~0.92 confidence) and mother Sarah Smith (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Robert Smith
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Sarah Smith
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Smith
Son · 1940 · age 30 · b. ~1910 · Massachusetts
★ You are viewing this record
Sibling
Douglas Smith
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Smith
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Roland Smith
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Smith
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Smith
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gordon Smith
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kenneth Smith
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Smith
Sibling · 1940 · age 33
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Andrew Smith
Sibling · 1940 · age 21
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
40 people indexed on this census page (nara:1940:m-t0627-01611-00220)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Virginia Pritchard | 14 | Daughter | — | Massachusetts |
| 2 | John Pritchard | 8 | Son | — | Massachusetts |
| 3 | Robert Smith | 58 | Head | Labor | Scotland |
| 4 | Sarah Smith | 54 | Wife | — | Scotland |
| 5 | John Smith THIS PERSON | 30 | Son | Truck Driver | Scotland |
| 6 | George Smith | 25 | Son | Clerk | Massachusetts |
| 7 | Margaret Smith | 23 | Daughter | Sewing Cutter | Massachusetts |
| 8 | Andrew Smith | 21 | Son | Truck Driver | Massachusetts |
| 9 | James Smith | 19 | Son | Printer | Massachusetts |
| 10 | Douglas Smith | 16 | Son | New Worker | Massachusetts |
| 11 | Kenneth Smith | 15 | Son | — | Massachusetts |
| 12 | Gordon Smith | 13 | Son | — | Massachusetts |
| 13 | William Smith | 33 | Son | Pin Boy | Scotland |
| 14 | Roland Smith | 3 | Son | — | New Hampshire |
| 15 | Isaac Lander | 43 | Head | Window Washer | Newfoundland |
| 16 | Violet Lander | 44 | Wife | — | Newfoundland |
| 17 | Harold Lander | 10 | Son | — | Massachusetts |
| 18 | Harvey Lander | 7 | Son | — | Massachusetts |
| 19 | Gordon Lander | 5 | Son | — | Massachusetts |
| 20 | Edward L. Roberts | 75 | Head | Salesman | Massachusetts |
| 21 | Philip Henes | 39 | Head | Truck Driver | Massachusetts |
| 22 | Gertrude Henes | 34 | Wife | — | Massachusetts |
| 23 | Irene Henes | 14 | Daughter | — | Massachusetts |
| 24 | Phyllis Henes | 12 | Daughter | — | Massachusetts |
| 25 | William Henes | 7 | Son | — | Massachusetts |
| 26 | Philip Jr. Henes | 1 | Daughter | — | Massachusetts |
| 27 | Francis Burns | 10 | Lodger | — | Massachusetts |
| 28 | Celestine Hartigan | 40 | Head | Meat Cutter | Newfoundland |
| 29 | Agnes Hartigan | 38 | Wife | — | Newfoundland |
| 30 | Nancy Hartigan | 7 | Daughter | — | Massachusetts |
| 31 | Robert Hartigan | 3 | Son | — | Massachusetts |
| 32 | Edward Campbell | 29 | Head | Truck Driver | Massachusetts |
| 33 | Ellen Campbell | 29 | Daughter | — | Massachusetts |
| 34 | Robert Campbell | 6 | Son | — | Massachusetts |
| 35 | June Campbell | 2 | Daughter | — | Massachusetts |
| 36 | James H. Langille | 67 | Head | Truck Driver | Nova Scotia |
| 37 | Eloia Langille | 76 | Wife | — | Canada-English |
| 38 | James F. Prendergast | 44 | Head | Car Inspector | Massachusetts |
| 39 | Allan Macklin | 32 | Head | Labor | Massachusetts |
| 40 | Marie Macklin | 33 | Wife | — | Massachusetts |
Related Census Records
Pedigree Summary
John + 9 siblings
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)