HC
Helen Campbell — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Helen Campbell across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents William & Wm — first a daughter (b.~1910), then head of a 5-person household.
Age 30
b. ~1910
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Campbell |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Cambridge |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Registered Nurse |
| Industry | Private Family |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 861 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Registered Nurse |
| Township / Ward | Cambridge |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Helen | Age | Birth yr |
|---|---|---|---|---|
| Helen Campbell | Daughter | — | 30 | ~1910 |
| William Campbell | Head | — | 58 | ~1882 |
| William Campbell | Son | — | 23 | ~1917 |
| Charles Campbell | Son | — | 28 | ~1912 |
| Margaret Campbell | Spouse | — | 47 | ~1893 |
Census Appearances
1920
Middlesex, Massachusetts
Other, age 9
Middlesex, Massachusetts · implied b. ~1911 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Helen |
| Relationship to Head | grand-daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 20
Middlesex, Massachusetts · implied b. ~1910 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Helen T |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| 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
Daughter, age 30
Middlesex-County, Massachusetts · implied b. ~1910 — 5 household members
| Surname | Campbell |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Cambridge |
| 1935 Residence (County) | Middlesex |
| Occupation | Registered Nurse |
| Industry | Private Family |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 861 |
| Highest Grade | Hs 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 Helen Campbell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Campbell (~0.92 confidence) and father Wm Campbell (~0.92 confidence) and mother Margaret Campbell (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Campbell
b. ~1882
Source father
● Household
· direct · ~0.92
Father
Wm Campbell
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Margaret Campbell
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Helen Campbell
Daughter · 1940 · age 30 · b. ~1910 · Massachusetts
★ You are viewing this record
Sibling
William Campbell
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Campbell
Sibling · 1940 · age 28
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-t0627-01684-00594)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James Boleyne | 51 | Head | Porter | England |
| 2 | Gertrude Boleyne | 36 | Wife | — | Canada Eng |
| 3 | James A Boleyne | 15 | Son | — | Rhode Island |
| 4 | William Campbell | 58 | Head | Fireman | Massachusetts |
| 5 | Margaret Campbell | 47 | Wife | — | Massachusetts |
| 6 | Helen Campbell THIS PERSON | 30 | Daughter | Registered Nurse | Massachusetts |
| 7 | Charles Campbell | 28 | Son | Truck Driver | Massachusetts |
| 8 | William Campbell | 23 | Son | Dispatcher | Massachusetts |
| 9 | Loring Burger | 63 | Head | Iron Worker | Canada Eng |
| 10 | Sophia Burger | 63 | Wife | — | Canada Eng |
| 11 | George Brown | 27 | Head | Iron Worker | Maine |
| 12 | Alice Brown | 25 | Wife | — | Maine |
| 13 | John Miller | 35 | Head | Candy Maker | Vermont |
| 14 | Barbara Miller | 30 | Wife | — | Vermont |
| 15 | Albert Jenkins | 40 | Head | Auto Repair | Maine |
| 16 | Mary Jenkins | 35 | Wife | — | Maine |
| 17 | Alice Jenkins | 18 | Daughter | New Worker | Maine |
| 18 | George Jenkins | 13 | Son | — | Maine |
| 19 | Albert Jenkins | 11 | Son | — | Maine |
| 20 | Albert Heit | 38 | Head | Timekeeper | Massachusetts |
| 21 | Flora Heit | 40 | Wife | — | Scotland |
| 22 | Doris Heit | 11 | Daughter | — | Massachusetts |
| 23 | Martha Heit | 8 | Daughter | — | Massachusetts |
| 24 | Elizabeth Heit | 4 | Daughter | — | Massachusetts |
| 25 | Bernard Heit | 3 | Son | — | Massachusetts |
| 26 | Barbara Cleaves | 28 | Head | — | Massachusetts |
| 27 | Jacqueline Cleaves | 8 | Daughter | — | Massachusetts |
| 28 | Thelma Cleaves | 7 | Daughter | — | Massachusetts |
| 29 | Ruth Cleaves | 6 | Daughter | — | Massachusetts |
| 30 | Ronald Cleaves | 2 | Son | — | Massachusetts |
| 31 | Louisa Lyons | 52 | Head | — | Massachusetts |
| 32 | Joseph Lyons | 22 | Son | Laborer | Massachusetts |
| 33 | Gertrude Lyons | 19 | Daughter | New Worker | Massachusetts |
| 34 | Alphonso Gonzales | 51 | Head | Stationary Fireman | Spain |
| 35 | Eva Gonzales | 51 | Wife | Stitcher | Massachusetts |
| 36 | Joseph Robillard | 35 | Head | Pack Hamper Operator | New York |
| 37 | Helen Robillard | 31 | Wife | — | Massachusetts |
| 38 | Elaine Robillard | 6 | Daughter | — | Massachusetts |
| 39 | Rosemarie Robillard | 3 | Daughter | — | Massachusetts |
| 40 | Joseph Robillard | 2 | Son | — | Massachusetts |
Pedigree Summary
Helen + 2 siblings
Gen 1 · 3 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)