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Mary Griffith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Blair-County, Pennsylvania
Our Model Tree links this Mary Griffith across the 1930 and 1940 US Censuses in Blair-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 8-person household.
Age 11
b. ~1929
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Blair-County, Pennsylvania |
| Surname | Griffith |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Logan Township |
| 1935 Residence (County) | Blair |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Logan Township |
| Est. Birth Year | ~1929 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Jacqueline Griffith | Daughter | — | 10 | ~1930 |
| Jean Griffith | Daughter | — | 3 | ~1937 |
| Betsy Griffith | Daughter | — | 1 | ~1939 |
| Mary Griffith | Daughter | — | 11 | ~1929 |
| Martha Griffith | Daughter | — | 5 | ~1935 |
| Catherine Griffith | Daughter | — | 7 | ~1933 |
| Sylvester Griffith | Head | — | 36 | ~1904 |
| Anna Griffith | Spouse | — | 37 | ~1903 |
Census Appearances
1930
Blair, Pennsylvania
Daughter, age 1
Blair, Pennsylvania · implied b. ~1929 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffith |
| Given Name | Mary Lou |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Blair-County, Pennsylvania
Daughter, age 11
Blair-County, Pennsylvania · implied b. ~1929 — 8 household members
| Surname | Griffith |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Logan Township |
| 1935 Residence (County) | Blair |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Griffith across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Griffith
Daughter · 1940 · age 11 · b. ~1929 · Pennsylvania
★ You are viewing this record
Sibling
Jacqueline Griffith
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Griffith
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Griffith
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betsy Griffith
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Griffith
Sibling · 1940 · age 7
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 — Blair-County, Pennsylvania
Open full size
1940 US Federal Census — Blair-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03441-00101)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Adaline Malkin | 23 | Wife | — | Pennsylvania |
| 42 | David Malkin | 1 | Son | — | Pennsylvania |
| 43 | Frances Lischer | 80 | Head | — | Germany |
| 44 | George H. Lischer | 36 | Son | Laborer | Pennsylvania |
| 45 | Madeline G. Lischer | 27 | Daughter | — | Pennsylvania |
| 46 | Barbara J. Lischer | 21 | Daughter | — | Pennsylvania |
| 47 | Leo A. Hanlon | 41 | Head | Owner | Pennsylvania |
| 48 | Mary M. Hanlon | 44 | Wife | — | Pennsylvania |
| 49 | Patrick Hanlon | 13 | Son | — | Pennsylvania |
| 50 | James Hanlon | 12 | Son | — | Pennsylvania |
| 51 | Patrick Hanlon | 5 | Son | — | Pennsylvania |
| 52 | Richard Hanlon | 7 | Son | — | Pennsylvania |
| 53 | Mary Jo Hanlon | 4 | Daughter | — | Pennsylvania |
| 54 | Stephen P. Nemir | 30 | Head | Truck Driver | Pennsylvania |
| 55 | Olga Nemir | 28 | Wife | — | Pennsylvania |
| 56 | Stephen S. Nemir | 3 | Son | — | Pennsylvania |
| 57 | Valerie Nemir | 2 | Daughter | — | Pennsylvania |
| 58 | Thomas J. Dillon | 27 | Head | Surveyor | Pennsylvania |
| 59 | Martha J. Dillon | 26 | Wife | — | Pennsylvania |
| 60 | Patricia A. Dillon | 6 | Daughter | — | Pennsylvania |
| 61 | Robert P. Dillon | 4 | Son | — | Pennsylvania |
| 62 | Jerome M. Dillon | 2 | Son | — | Pennsylvania |
| 63 | Margaret L. Sorey | 41 | Maid | Maid | Pennsylvania |
| 64 | Martha J. Summers | 81 | Grand Mother | — | Pennsylvania |
| 65 | Walter Mccarry | 36 | Head | Common Laborer | Pennsylvania |
| 66 | Ethel Mccarry | 33 | Wife | — | Pennsylvania |
| 67 | Walter Jr. Mccarry | 13 | Son | — | Pennsylvania |
| 68 | Phyllis Mccarry | 12 | Daughter | — | Pennsylvania |
| 69 | Sylvester Griffith | 36 | Head | Garage Mechanic | Pennsylvania |
| 70 | Anna Griffith | 37 | Wife | — | Pennsylvania |
| 71 | Mary Lou Griffith THIS PERSON | 11 | Daughter | — | Pennsylvania |
| 72 | Jacqueline Griffith | 10 | Daughter | — | Pennsylvania |
| 73 | Catherine Griffith | 7 | Daughter | — | Pennsylvania |
| 74 | Martha Griffith | 5 | Daughter | — | Pennsylvania |
| 75 | Jean Griffith | 3 | Daughter | — | Pennsylvania |
| 76 | Betsy Griffith | 1 | Daughter | — | Pennsylvania |
| 77 | Robert B. Weyandt | 47 | Head | Brakeman | Pennsylvania |
| 78 | Elva J. Weyandt | 47 | Wife | — | Pennsylvania |
| 79 | Arthur G. Weyandt | 18 | Son | — | Pennsylvania |
| 80 | Bernard L. Weyandt | 16 | Son | — | Pennsylvania |
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)