MC
Mary Carroll — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Carroll across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents John & John — first a daughter (b.~1917), then head of a 3-person household.
Age 23
b. ~1917
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Carroll |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Readville |
| Additional Details | |
| Occupation | clerk |
| Industry | Machine Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 800 |
| Highest Grade | Hs 4 |
| 1935 Residence | Mass. |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | Boston City |
| Est. Birth Year | ~1917 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Carroll | Daughter | — | 23 | ~1917 |
| John Carroll | Head | — | 50 | ~1890 |
| Anna Carroll | Spouse | — | 48 | ~1892 |
Census Appearances
1920
Suffolk, Massachusetts
Daughter, age 2
Suffolk, Massachusetts · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | England |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Daughter, age 13
Suffolk, Massachusetts · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | New York State |
| Occupation | Student |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 23
Suffolk-County, Massachusetts · implied b. ~1917 — 3 household members
| Surname | Carroll |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Readville |
| Occupation | clerk |
| Industry | Machine Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 800 |
| Highest Grade | Hs 4 |
| 1935 Residence | Mass. |
| 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 Carroll across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Carroll (~0.92 confidence) and father John Carroll (~0.92 confidence) and mother Anna Carroll (~0.92 confidence) and mother Annie Carroll (~0.92 confidence) and mother Anna Carroll (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Carroll
b. ~1890
Source father
● Household
· direct · ~0.92
Father
John Carroll
b. ~1891
Source father
● Household
· direct · ~0.92
Mother
Anna Carroll
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Annie Carroll
b. ~1892
Source mother
● Household
· direct · ~0.92
Mother
Anna Carroll
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Carroll
Daughter · 1940 · age 23 · b. ~1917 · Massachusetts
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01678-00573)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Moses Simon Moses | 21 | son | Attendant | Massachusetts |
| 42 | Henry Matton | 35 | Head | Laborer | Rhode Island |
| 43 | Loraine Matton | 13 | daughter | — | Massachusetts |
| 44 | Eva Matton | 12 | daughter | — | Mass. |
| 45 | Delia Matton | 10 | daughter | — | Mass. |
| 46 | Alfred Matton | 7 | son | — | Mass. |
| 47 | George Matton | 4 | son | — | Mass. |
| 48 | Gardner Johnson | 23 | Head | Chauffeur | Massachusetts |
| 49 | Helen Johnson | 21 | wife | Housewife | Massachusetts |
| 50 | Kenneth Johnson | 1 | son | — | Massachusetts |
| 51 | Sarah Broussard | 79 | Head | Housekeeper | Nova Scotia |
| 52 | Joseph Cori | 52 | Head | Laborer | Syria |
| 53 | John Cori | 25 | son | Laborer | Massachusetts |
| 54 | Emma S. Levasseur | 56 | Head | Housekeeper | Massachusetts |
| 55 | Rose A. Levasseur | 20 | daughter | W.P.A. Sewing | Massachusetts |
| 56 | Bertha Levasseur | 18 | daughter | — | Massachusetts |
| 57 | Alfred Levasseur | 2 | son | — | Massachusetts |
| 58 | Louisa Valentino | 49 | Head | Track Man | Italy |
| 59 | Edward J. Schiller | 49 | Head | Laborer | Massachusetts |
| 60 | Amelia Schiller | 43 | wife | Housewife | Rhode Island |
| 61 | George Schiller | 19 | son | Laborer | Massachusetts |
| 62 | Helen Schiller | 15 | daughter | — | Massachusetts |
| 63 | Louis Blouin | 41 | Head | Laborer | Maine |
| 64 | Rose R. Blouin | 40 | wife | Housewife | Massachusetts |
| 65 | Clarence Blouin | 12 | son | — | Massachusetts |
| 66 | Irene Blouin | 11 | daughter | — | Massachusetts |
| 67 | Dorothy Blouin | 8 | daughter | — | Massachusetts |
| 68 | Mary Dumont | 67 | mother | Housekeeper | Canada |
| 69 | Edward Dumont | 33 | brother | Helper | Massachusetts |
| 70 | Paul Lowell | 28 | Head | Machinist | Mass. |
| 71 | Catherine Lowell | 26 | wife | Housewife | Mass. |
| 72 | Paul Lowell | 6 | son | — | Mass. |
| 73 | Alvin Lowell | 4 | son | — | Mass. |
| 74 | John Lowell | 3 | son | — | Mass. |
| 75 | Isaac Rousseau | 44 | Head | Laborer | Massachusetts |
| 76 | Lucy Rousseau | 32 | wife | Housewife | Massachusetts |
| 77 | Frederick Rousseau | 5 | son | — | Mass. |
| 78 | John J. Carroll | 50 | Head | Sheet Metal | Massachusetts |
| 79 | Anna Carroll | 48 | wife | Housekeeper | Ireland |
| 80 | Mary Carroll THIS PERSON | 23 | daughter | Clerk | Massachusetts |
Pedigree Summary
Mary
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)