MC
Mary Carr — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Carr across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Joseph & Anna — first a daughter (b.~1913), then head of a 4-person household.
Age 27
b. ~1913
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Carr |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lowell |
| Est. Birth Year | ~1913 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Carr | Daughter | — | 27 | ~1913 |
| Joseph Carr | Head | — | 74 | ~1866 |
| Joseph Carr | Son | — | 32 | ~1908 |
| Anna Carr | Spouse | — | 65 | ~1875 |
Census Appearances
1920
Middlesex, Massachusetts
Other, age 7
Middlesex, Massachusetts · implied b. ~1913 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carr |
| Given Name | Mary |
| Relationship to Head | Granddaughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Other, age 17
Middlesex, Massachusetts · implied b. ~1913 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carr |
| Given Name | Mary |
| Relationship to Head | Niece |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Saleswoman |
| Industry | Candy Store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 27
Middlesex-County, Massachusetts · implied b. ~1913 — 4 household members
| Surname | Carr |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell |
| 1935 Residence (County) | Middlesex |
| Class of Worker | 0 |
| 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 Mary Carr across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Carr (~0.92 confidence) and mother Anna Carr (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Carr
b. ~1866
Source father
● Household
· direct · ~0.92
Mother
Anna Carr
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Carr
Daughter · 1940 · age 27 · b. ~1913 · Massachusetts
★ You are viewing this record
Sibling
Joseph Carr
Sibling · 1940 · age 32
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-t0627-01692-00614)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ara Laplume | 33 | Wife | Weaver | New Hampshire |
| 42 | Leo Laplume | 11 | Son | — | Massachusetts |
| 43 | Rita Laplume | 6 | Daughter | — | Massachusetts |
| 44 | Estelle Laplume | 5 | Daughter | — | Massachusetts |
| 45 | Roger Laplume | 4 | Son | — | Massachusetts |
| 46 | Roland Laplume | 3 | Son | — | Massachusetts |
| 47 | Eugene A. Carr | 30 | Head | Laborer | Massachusetts |
| 48 | Lucille Carr | 24 | Wife | — | New Hampshire |
| 49 | Nancy L. Carr | 2 | Daughter | — | Massachusetts |
| 50 | Joseph B. Carr | 74 | Head | — | Canada English |
| 51 | Anna Carr | 65 | Wife | — | Northern Ireland |
| 52 | Joseph J. Carr | 32 | Son | Laborer | Massachusetts |
| 53 | Mary E. Carr THIS PERSON | 27 | Daughter | — | Massachusetts |
| 54 | Libery Giguere | 26 | Head | Truck Driver | Massachusetts |
| 55 | Cecile Giguere | 25 | Wife | Coverer | Massachusetts |
| 56 | Theresa Giguere | 5 | Daughter | — | Massachusetts |
| 57 | Robert Giguere | 3 | Son | — | Massachusetts |
| 58 | Roland Giguere | 1 | Son | — | Massachusetts |
| 59 | Agnes B. Panton | 57 | Head | — | Ireland |
| 60 | Julia D. O'Neill | 32 | Head | Assistant Cook | Massachusetts |
| 61 | Leo O'Neill | 13 | Son | — | Massachusetts |
| 62 | Lillian O'Neill | 3 | Daughter | — | Massachusetts |
| 63 | — | None | — | — | — |
| 64 | Lucien Lemay | 48 | Head | — | Canada French |
| 65 | Angelina Lemay | 45 | Wife | — | Massachusetts |
| 66 | Margaret Lemay | 19 | Daughter | Seamstress | Massachusetts |
| 67 | Robert Lemay | 16 | Son | — | Massachusetts |
| 68 | Jeannette Lemay | 14 | Daughter | — | Massachusetts |
| 69 | Leo Lemay | 12 | Son | — | Massachusetts |
| 70 | Armand Lemay | 10 | Son | — | Massachusetts |
| 71 | Paul Lemay | 5 | Son | — | Massachusetts |
| 72 | Theresa Lemay | 4 | Daughter | — | Massachusetts |
| 73 | Richard Lemay | 1 | Son | — | Massachusetts |
| 74 | Donat Trudel | 49 | Head | Carpenter | Canada French |
| 75 | Clara Trudel | 41 | Wife | — | Canada French |
| 76 | Gertrude Trudel | 21 | Daughter | Coverer | Massachusetts |
| 77 | Ernest Trudel | 19 | Son | Laborer | Massachusetts |
| 78 | William Trudel | 15 | Son | — | Massachusetts |
| 79 | Dorothy Trudel | 13 | Daughter | — | Massachusetts |
| 80 | Simone Trudel | 10 | Daughter | — | Massachusetts |
Pedigree Summary
Mary + 1 sibling
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)