MG
Mary Griffin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Mary Griffin across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Sarah & Sarah — first a daughter (b.~1909), then head of a 6-person household.
Age 31
b. ~1909
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Griffin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Typist |
| Industry | Advertising |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 236 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Typist |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1909 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Griffin | Daughter | — | 31 | ~1909 |
| Helen Griffin | Daughter | — | 20 | ~1920 |
| John Griffin | Head | — | 52 | ~1888 |
| Edward Griffin | Son | — | 19 | ~1921 |
| Michael Griffin | Son | — | 15 | ~1925 |
| Sarah Griffin | Spouse | — | 56 | ~1884 |
Census Appearances
1920
Allegheny, Pennsylvania
Daughter, age 11
Allegheny, Pennsylvania · implied b. ~1909 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Allegheny, Pennsylvania
Daughter, age 21
Allegheny, Pennsylvania · implied b. ~1909 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Servant |
| Industry | Hospital |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Allegheny-County, Pennsylvania
Daughter, age 31
Allegheny-County, Pennsylvania · implied b. ~1909 — 6 household members
| Surname | Griffin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Occupation | Typist |
| Industry | Advertising |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 236 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| 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 Griffin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Sarah Griffin (~0.92 confidence) and mother Sarah Griffin (~0.92 confidence) and father John Griffin (~0.92 confidence) and father John Griffin (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Sarah Griffin
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Sarah Griffin
b. ~1884
Source mother
● Household
· direct · ~0.92
Father
John Griffin
b. ~1886
Source father
● Household
· direct · ~0.92
Father
John Griffin
b. ~1888
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Griffin
Daughter · 1940 · age 31 · b. ~1909 · Pennsylvania
★ You are viewing this record
Sibling
Michael Griffin
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Griffin
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Griffin
Sibling · 1940 · age 20
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 — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-03653-00266)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary B. Walsh | 63 | Head | — | Pennsylvania |
| 42 | James O'Malley | 57 | Head | Cement Finisher | Ohio |
| 44 | Elizabeth Crawford | 53 | Head | — | Pennsylvania |
| 45 | George Burnham | 50 | Lodger | Draftsman | Pennsylvania |
| 46 | Francis Martin | 52 | Lodger | — | New York |
| 47 | Nicholas Berger | 56 | Lodger | Electrician | Pennsylvania |
| 48 | Joseph Joy | 50 | Lodger | — | Ohio |
| 49 | John Carroll | 27 | Lodger | Laborer | Pennsylvania |
| 50 | Frances Carroll | 21 | Lodger | — | Pennsylvania |
| 52 | Thomas Matthews | 67 | Head | Laborer | Pennsylvania |
| 53 | John Matthews | 25 | Son | Shipping Clerk | Pennsylvania |
| 54 | Robert Matthews | 23 | Son | Bellman | Pennsylvania |
| 55 | William Matthews | 23 | Son | Laborer | Pennsylvania |
| 56 | Mary Matthews | 27 | Daughter-in-law | Saleslady | Pennsylvania |
| 57 | Bertha Sloran | 24 | Nurse | — | Pennsylvania |
| 58 | Catherine Casey | 72 | Head | — | Ireland |
| 59 | Helen Casey | 34 | Daughter | Typist | Pennsylvania |
| 60 | James Casey | 38 | Son | Truck Driver | Pennsylvania |
| 61 | Sylvester Vaughan | 37 | Son-in-law | Cooper | Pennsylvania |
| 62 | Madeline Vaughan | 37 | Daughter | — | Pennsylvania |
| 63 | Mary Catherine Vaughan | 4 | Granddaughter | — | Pennsylvania |
| 64 | Thomas Vaughan | 1 | Grandson | — | Pennsylvania |
| 65 | John Griffin | 52 | Head | Laborer | Western Ireland |
| 66 | Sarah Griffin | 56 | Wife | — | Northern Ireland |
| 67 | Mary Griffin THIS PERSON | 31 | Daughter | Typist | Massachusetts |
| 68 | Helen Griffin | 20 | Daughter | Stenographer | Pennsylvania |
| 69 | Edward Griffin | 19 | Son | — | Pennsylvania |
| 70 | Michael Griffin | 15 | Son | — | Pennsylvania |
| 71 | Michael Tearch | 45 | Head | Laborer | Hungary |
| 72 | Anne Tearch | 42 | Wife | — | Ohio |
| 73 | Michael Jr. Tearch | 19 | Son | — | Pennsylvania |
| 74 | Helen Tearch | 16 | Daughter | — | Pennsylvania |
| 75 | John Tearch | 14 | Son | — | Pennsylvania |
| 76 | Susan Tearch | 11 | Daughter | — | Pennsylvania |
| 77 | Irene Tearch | 5 | Daughter | — | Pennsylvania |
| 78 | Margaret Tearch | 3 | Daughter | — | Pennsylvania |
| 79 | Robert H. Male | 52 | Head | Gardner | Pennsylvania |
| 80 | Catherine Male | 51 | Wife | — | Pennsylvania |
Pedigree Summary
Mary + 3 siblings
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)