WC
William Campbell — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Campbell across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Joseph & Carl — first a son (b.~1916), then head of a 6-person household.
Age 24
b. ~1916
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Campbell |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Medford City |
| Est. Birth Year | ~1916 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Mary Campbell | Daughter | — | 12 | ~1928 |
| Doris Campbell | Daughter | — | 16 | ~1924 |
| Carl Campbell | Head | — | 53 | ~1887 |
| Eldon Campbell | Son | — | 26 | ~1914 |
| William Campbell | Son | — | 24 | ~1916 |
| Margaret Campbell | Spouse | — | 50 | ~1890 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 5
Middlesex, Massachusetts · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 15
Middlesex, Massachusetts · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | William P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 24
Middlesex-County, Massachusetts · implied b. ~1916 — 6 household members
| Surname | Campbell |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | Hs 2 |
| 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 William Campbell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Campbell (~0.92 confidence) and father Carl Campbell (~0.92 confidence) and mother Margaret Campbell (~0.92 confidence) and mother Katherine Campbell (~0.92 confidence) and mother Catherine Campbell (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Campbell
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Carl Campbell
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Margaret Campbell
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Katherine Campbell
b. ~1879
Source mother
● Household
· direct · ~0.92
Mother
Catherine Campbell
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Campbell
Son · 1940 · age 24 · b. ~1916 · Massachusetts
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Sibling
Eldon Campbell
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Doris Campbell
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Campbell
Sibling · 1940 · age 12
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-t0627-01611-00291)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Bennett Lord | 64 | Head | — | Maine |
| 42 | James R Lord | 55 | Husband | — | New Hampshire |
| 43 | Shirley Lord | 19 | Daughter | — | Massachusetts |
| 44 | Salvatore Fazio | 61 | Head | Manager | Italy |
| 45 | Carmella Fazio | 59 | Wife | — | Italy |
| 46 | Santa Fazio | 32 | Daughter | Clerk | Massachusetts |
| 47 | Zena Fazio | 30 | Daughter | Clerk | Massachusetts |
| 48 | Salvatore Jr Fazio | 22 | Son | Manager | Massachusetts |
| 49 | Joseph Fazio | 20 | Son | Fisherman | Massachusetts |
| 50 | Mary G Harrington | 67 | Head | — | Massachusetts |
| 51 | Margaret A Harrington | 32 | Daughter | — | Massachusetts |
| 52 | Mary Danyon | 64 | Head | Charwoman | Eire |
| 53 | Hollis Quirk | 47 | Head | Chauffeur | Massachusetts |
| 54 | Julia Quirk | 44 | Wife | — | Massachusetts |
| 55 | Alice E Quirk | 17 | Daughter | — | Massachusetts |
| 56 | John H Quirk | 13 | Son | — | Massachusetts |
| 57 | Carl Campbell | 53 | Head | Ship Carpenter | Canada |
| 58 | Margaret Campbell | 50 | Wife | Charwoman | Canada |
| 59 | Eldon Campbell | 26 | Son | Bank Teller | Massachusetts |
| 60 | William Campbell THIS PERSON | 24 | Son | — | Massachusetts |
| 61 | Doris Campbell | 16 | Daughter | — | Massachusetts |
| 62 | Mary Campbell | 12 | Daughter | — | Massachusetts |
| 63 | Thomas Convery | 43 | Head | Clerk-Dispenser | Massachusetts |
| 64 | Gertrude Convery | 41 | Wife | — | Massachusetts |
| 65 | Thomas Convery | 17 | Son | — | Massachusetts |
| 66 | John Convery | 13 | Son | — | Massachusetts |
| 67 | Edward J Convery | 11 | Son | — | Massachusetts |
| 68 | Mary E Convery | 5 | Daughter | — | Massachusetts |
| 69 | Roy Mcmanus | 60 | Lodger | — | Canada |
| 70 | John Para | 26 | Head | Clerk-Dispenser | Rhode Island |
| 71 | Mary Para | 24 | Wife | — | Rhode Island |
| 72 | Salvatore | 65 | Head | — | Italy |
| 73 | Pasquale Leeder | 45 | Son-in-law | Medical Doctor | Italy |
| 74 | Angela Bonpape | 21 | Grand-child | — | Massachusetts |
| 75 | Mary E Hartnett | 38 | Head | — | Massachusetts |
| 76 | Jane B R Hartnett | 15 | Son | — | Massachusetts |
| 77 | Pauline Hartnett | 14 | Daughter | — | Massachusetts |
| 78 | Catherine Glennon | 72 | Mother | — | Eire |
| 79 | Josephine Fazio | 24 | Daughter-in-law | Hostess | Massachusetts |
| 80 | Ralph Thompson | 40 | Head | Assistant District Manager | Massachusetts |
Pedigree Summary
William + 3 siblings
Gen 1 · 5 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)