DC
David Campbell — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this David Campbell across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Robert & Robert — first a son (b.~1914), then head of a 4-person household.
Age 26
b. ~1914
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Campbell |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Factory worker |
| Industry | Worcester Paper Box |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 650 |
| Highest Grade | No 7 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Factory Worker |
| Township / Ward | Medford City |
| 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to David | Age | Birth yr |
|---|---|---|---|---|
| David Campbell | Son | — | 26 | ~1914 |
| Emily Callinan | Spouse | — | 34 | ~1906 |
| Anna Campbell | Head | — | 55 | ~1885 |
| Edmund Campbell | Son | — | 36 | ~1904 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 6
Middlesex, Massachusetts · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | David W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 16
Middlesex, Massachusetts · implied b. ~1914 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | David W. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 26
Middlesex-County, Massachusetts · implied b. ~1914 — 4 household members
| Surname | Campbell |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Occupation | Factory worker |
| Industry | Worcester Paper Box |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 650 |
| Highest Grade | No 7 |
| 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 David Campbell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Robert Campbell (~0.92 confidence) and father Robert Campbell (~0.92 confidence) and mother Anna Campbell (~0.92 confidence) and mother Carrie Campbell (~0.92 confidence) and mother Emily Callinan (~0.60 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.86
Father
Robert Campbell
b. ~1889
Source father
● Household
· direct · ~0.92
Father
Robert Campbell
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Anna Campbell
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Carrie Campbell
b. ~1894
Source mother
● Household
· direct · ~0.92
Mother
Emily Callinan
b. ~1906
Source mother
● Household
· direct · ~0.6
This person
Anchor record
David Campbell
Son · 1940 · age 26 · b. ~1914 · Massachusetts
★ You are viewing this record
Sibling
Edmund Campbell
Sibling · 1940 · age 36
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-t0627-01611-00114)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William J. Doherty | 18 | Son | — | Massachusetts |
| 42 | Robert J. Doherty | 16 | Son | — | Massachusetts |
| 43 | Lida Ostling | 39 | Wife | — | Sweden |
| 44 | Carl Ostling | 49 | Head | Boiler Maker | Sweden |
| 45 | Lida Ostling | 18 | daughter | House Work | Sweden |
| 46 | Anna Ostling | 16 | daughter | House Work | Sweden |
| 47 | Ingrid Ostling | 10 | daughter | — | Massachusetts |
| 48 | Carl Ostling | 7 | Son | — | Massachusetts |
| 49 | Christina Gunther | 68 | Wife | — | Sweden |
| 50 | Carl Gunther | 65 | Head | Boat Maker | Sweden |
| 51 | Harold Hall | 44 | Head | Driver | Massachusetts |
| 52 | Ellen Hall | 39 | Wife | Shoe Worker | Massachusetts |
| 53 | Ellen M. Hall | 10 | daughter | — | Massachusetts |
| 54 | Helen Gunther | 38 | Wife | — | Massachusetts |
| 55 | Alfred Gunther | 36 | Head | Rubber Worker | Massachusetts |
| 56 | Alfred Gunther | 4 | Son | — | Massachusetts |
| 57 | Anna Flemming | 12 | lodger | — | Massachusetts |
| 58 | Joseph Flemming | 39 | lodger | Plumber | Massachusetts |
| 59 | Thomas R. Boyle | 31 | Head | Letter Carrier | Massachusetts |
| 60 | Geraldine Boyle | 31 | Wife | — | Massachusetts |
| 61 | Nancy Boyle | 1 | daughter | 0 | Massachusetts |
| 62 | Anna Campbell | 55 | Head | Dietician | Massachusetts |
| 63 | Edmund Campbell | 36 | Son | Laborer | Massachusetts |
| 64 | David Campbell THIS PERSON | 26 | Son | Factory Worker | Massachusetts |
| 65 | Emily S. Callinan | 34 | Wife | — | Massachusetts |
| 66 | Francis Callinan | 37 | Head | Chauffeur | Massachusetts |
| 67 | William Callinan | 13 | Son | — | Massachusetts |
| 68 | Dorothy Callinan | 8 | daughter | — | Massachusetts |
| 69 | Mary C. Ahern | 39 | Head | Bookkeeping Machine Operator | Massachusetts |
| 70 | Elizabeth Ahern | 37 | Sister | Comptometer Operator | Massachusetts |
| 71 | Katherine Harrington | 43 | Wife | — | Lexington |
| 72 | Edward Harrington | 43 | Head | 54 | Malden |
| 73 | Edward Harrington | 15 | Son | — | Malden |
| 74 | Vincent Amoroso | 39 | Head | Police Officer | Massachusetts |
| 75 | Grace Amoroso | 37 | Wife | — | Massachusetts |
| 76 | Vincent Amoroso | 9 | Son | — | Massachusetts |
| 77 | Michael Harrington | 75 | Father in law | — | Massachusetts |
| 78 | Nora T. Harrington | 75 | Mother in law | — | Southern Ireland |
| 79 | Mary H. Lawton | 47 | Wife | — | New Brunswick |
| 80 | Henry Lawton | 45 | Head | Post Office Clerk | Massachusetts |
Pedigree Summary
David + 1 sibling
Gen 1 · 5 parents
~0.86
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)