MH
Mary Hart — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Hart across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents John & Mary — first a spouse (b.~1903), then head of a 2-person household.
Age 37
b. ~1903
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Hart |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1903 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Linda Hart | Daughter | — | 17 | ~1923 |
| Mary Hart | Spouse | — | 37 | ~1903 |
Census Appearances
1920
Suffolk, Massachusetts
Daughter, age 19
Suffolk, Massachusetts · implied b. ~1901 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hart |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Stenographer |
| Industry | Factory |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Daughter, age 27
Suffolk, Massachusetts · implied b. ~1903 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hart |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Stenographer |
| Industry | Laundry |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Spouse, age 37
Suffolk-County, Massachusetts · implied b. ~1903 — 2 household members
| Surname | Hart |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Income (1939) | 0 |
| Highest Grade | H-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 Hart across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Hart (~0.92 confidence) and mother Mary Hart (~0.92 confidence) and father Timothy Hart (~0.92 confidence) and mother Bridget Hart (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Hart
b. ~1868
Source father
● Household
· direct · ~0.92
Mother
Mary Hart
b. ~1872
Source mother
● Household
· direct · ~0.92
Father
Timothy Hart
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Bridget Hart
b. ~1874
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Hart
Spouse · 1940 · age 37 · b. ~1903 · 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-t0627-01679-00627)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary E. Hart THIS PERSON | 37 | Wife | — | Massachusetts |
| 42 | Linda G. Hart | 17 | Daughter | — | Massachusetts |
| 43 | George P. Murray | 48 | Head | Mechanic | Massachusetts |
| 44 | Evelyn Murray | 41 | Wife | — | Massachusetts |
| 45 | George C. Murray | 15 | Son | — | Massachusetts |
| 46 | George Cody | 40 | Head | Salesman | Massachusetts |
| 47 | Alice M. Cody | 34 | Wife | — | Massachusetts |
| 48 | Alice J. Cody | 5 | Daughter | — | Massachusetts |
| 49 | — | None | — | — | — |
| 50 | Herbert A. King | 74 | Head | Meatcutter | England |
| 51 | Mary A. King | 65 | Wife | — | Newfoundland |
| 52 | Edith M. King | 35 | Daughter | Operator | Massachusetts |
| 53 | Margaret Deery | 70 | Sister | Cook | Newfoundland |
| 54 | Peter Kyne | 39 | Head | Chauffeur | Irish Free State |
| 55 | Mary E. Kyne | 38 | Wife | — | Irish Free State |
| 56 | Mary Kyne | 10 | Daughter | — | Massachusetts |
| 57 | Mary E. Hynes | 47 | Wife | — | Irish Free State |
| 58 | Thomas J. Hynes | 52 | Head | Operator | Massachusetts |
| 59 | Margaret Garrity | 7 | Niece | — | New York |
| 60 | Hugh F. Slane | 78 | Head | Bartender | Rhode Island |
| 61 | Amelia L. Slane | 70 | Wife | — | Massachusetts |
| 62 | Thomas Green | 45 | Head | Electrician | Massachusetts |
| 63 | Helen F. Green | 46 | Wife | — | Massachusetts |
| 64 | John J. Murphy | 50 | Head | Boilermaker | Irish Free State |
| 65 | Agnes B. Murphy | 47 | Wife | — | Massachusetts |
| 66 | Mary V. Murphy | 7 | Daughter | — | Massachusetts |
| 67 | James J. Mccabe | 51 | Lodger | Porter | England |
| 68 | Patrick J. Niggan | 31 | Head | Checker | Massachusetts |
| 69 | Sarah Niggan | 29 | Wife | — | Massachusetts |
| 70 | Mary E. Niggan | 6 | Daughter | — | Massachusetts |
| 71 | Alice J. Niggan | 4 | Daughter | — | Massachusetts |
| 72 | John J. Tracy | 50 | Head | Policeman | Irish Free State |
| 73 | Anna M. Tracy | 45 | Wife | — | Irish Free State |
| 74 | Thomas J. Tracy | 22 | Son | Policeman | Massachusetts |
| 75 | John T. Tracy | 19 | Son | — | Massachusetts |
| 76 | Mary G. Haggerty | 47 | Head | — | Massachusetts |
| 77 | Helen J. Haggerty | 45 | Sister | Salesgirl | Massachusetts |
| 78 | Annie Macdonald | 43 | Head | Stenographer | Massachusetts |
| 79 | Anna E. Macdonald | 20 | Daughter | — | Massachusetts |
| 80 | Francis G. Macdonald | 16 | Son | — | Massachusetts |
Pedigree Summary
Mary
Gen 1 · 4 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)