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Joan Smith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Joan Smith across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 10-person household.
Age 18
b. ~1922
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Smith |
| Given Name | Joan |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1922 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Joan | Age | Birth yr |
|---|---|---|---|---|
| Michael Smith | Son | — | 27 | ~1913 |
| Vincent Smith | Son | — | 12 | ~1928 |
| Robert Mccarthy | Other | — | 12 | ~1928 |
| John Dorgan | Other | — | 63 | ~1877 |
| Gilbert Smith | Head | — | 50 | ~1890 |
| Bridget Smith | Spouse | — | 50 | ~1890 |
| Dolores Smith | Daughter | — | 16 | ~1924 |
| William Smith | Son | — | 23 | ~1917 |
| Joan Smith | Daughter | — | 18 | ~1922 |
| Mary Smith | Daughter | — | 21 | ~1919 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 7
Middlesex, Massachusetts · implied b. ~1923 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Joan |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Maryland |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 18
Middlesex-County, Massachusetts · implied b. ~1922 — 10 household members
| Surname | Smith |
| Given Name | Joan |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| 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 Joan Smith across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Joan Smith
Daughter · 1940 · age 18 · b. ~1922 · Massachusetts
★ You are viewing this record
Sibling
Michael Smith
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Smith
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Vincent Smith
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dolores Smith
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary 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-t0627-01702-00626)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Angeline Malloy | 55 | Head | — | Canada-English |
| 2 | Charlotte Malloy | 28 | Daughter | Telegraph Operator | Massachusetts |
| 3 | Mary Malloy | 25 | Daughter | — | Massachusetts |
| 4 | Ruth Malloy | 22 | Daughter | Clerk | Massachusetts |
| 5 | Patrick Durkin | 41 | Head | Assembler | Eire |
| 6 | Margaret Durkin | 41 | Wife | — | Eire |
| 7 | Margaret Durkin | 16 | Daughter | — | Massachusetts |
| 8 | Catherine Durkin | 15 | Daughter | — | Massachusetts |
| 9 | Richard Durkin | 13 | Son | — | Massachusetts |
| 10 | Ann Durkin | 8 | Daughter | — | Massachusetts |
| 11 | James Durkin | 6 | Son | — | Massachusetts |
| 12 | Margaret Durkin | 3 | Daughter | — | Massachusetts |
| 13 | Frank Zygala | 25 | Head | Counterman | Massachusetts |
| 14 | Ann Zygala | 22 | Wife | — | Massachusetts |
| 15 | Diana Zygala | 0 | Daughter | — | Massachusetts |
| 16 | Manuel Beatana | 71 | Head | — | Portugal |
| 17 | Mary Beatana | 61 | Wife | — | Portugal |
| 18 | Anthony Beatana | 21 | Son | Tile-Layer | Massachusetts |
| 19 | Herbert Holden | 49 | Head | Electrician | Massachusetts |
| 20 | Helen Holden | 49 | Wife | — | Massachusetts |
| 21 | Herbert Holden | 21 | Son | Selling Clerk | Massachusetts |
| 22 | Mary Holden | 12 | Daughter | — | Massachusetts |
| 23 | Gilbert Smith | 50 | Head | Machinist | Eire |
| 24 | Bridget Smith | 50 | Wife | — | Eire |
| 25 | Michael Smith | 27 | Son | Reporter | Massachusetts |
| 26 | William Smith | 23 | Son | Freight Handler | Massachusetts |
| 27 | Mary Smith | 21 | Daughter | Secretary | Massachusetts |
| 28 | Joan Smith THIS PERSON | 18 | Daughter | — | Massachusetts |
| 29 | Dolores Smith | 16 | Daughter | — | Massachusetts |
| 30 | Vincent Smith | 12 | Son | — | Massachusetts |
| 31 | John Dorgan | 63 | Lodger | Laborer | Eire |
| 32 | Robert Mccarthy | 12 | Lodger | — | Massachusetts |
| 33 | Walter Barrett | 76 | Head | — | Canada-English |
| 34 | Catherine Barrett | 72 | Wife | — | Massachusetts |
| 35 | Joseph Carreiro | 31 | Head | Auto-Mechanic | Portugal |
| 36 | Hilda Carreiro | 31 | Wife | Stitcher | Portugal |
| 37 | Joseph Carreiro | 7 | Son | — | Massachusetts |
| 38 | Louis Jorge | 37 | Head | Barber | Portugal |
| 39 | Alda Jorge | 36 | Wife | — | Portugal |
| 40 | Priscilla Jorge | 12 | 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)