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Mary Shaffer — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Fayette-County, Pennsylvania
Our Model Tree links this Mary Shaffer across the 1930 and 1940 US Censuses in Fayette-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 10-person household.
Age 12
b. ~1928
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Fayette-County, Pennsylvania |
| Surname | Shaffer |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Wharton T |
| 1935 Residence (County) | Fayette |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H 7 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Wharton T |
| Est. Birth Year | ~1928 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Ada Shaffer | Spouse | — | 42 | ~1898 |
| Agnes Shaffer | Daughter | — | 20 | ~1920 |
| Alonzo Shaffer | Son | — | 10 | ~1930 |
| Frances Shaffer | Daughter | — | 15 | ~1925 |
| Hugo Shaffer | Head | — | 55 | ~1885 |
| Mary Shaffer | Daughter | — | 12 | ~1928 |
| Syllian Shaffer | Daughter | — | 16 | ~1924 |
| Sarah Shaffer | Daughter | — | 6 | ~1934 |
| Edgar Shaffer | Son | — | 8 | ~1932 |
| Evelyn Shaffer | Daughter | — | 18 | ~1922 |
Census Appearances
1930
Fayette, Pennsylvania
Daughter, age 3
Fayette, Pennsylvania · implied b. ~1927 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Shaffer |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Fayette-County, Pennsylvania
Daughter, age 12
Fayette-County, Pennsylvania · implied b. ~1928 — 10 household members
| Surname | Shaffer |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Wharton T |
| 1935 Residence (County) | Fayette |
| Class of Worker | 0 |
| Highest Grade | H 7 |
| 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 Shaffer across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Shaffer
Daughter · 1940 · age 12 · b. ~1928 · Pennsylvania
★ You are viewing this record
Sibling
Evelyn Shaffer
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Agnes Shaffer
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alonzo Shaffer
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sarah Shaffer
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edgar Shaffer
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Syllian Shaffer
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Shaffer
Sibling · 1940 · age 15
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 — Fayette-County, Pennsylvania
Open full size
1940 US Federal Census — Fayette-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03508-00847)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Alice Arbaugh | 12 | Granddaughter | — | Pennsylvania |
| 2 | Joseph Mancino | 39 | Lodger | Laborer | Pennsylvania |
| 3 | Hugo Shaffer | 55 | Head | Farmer | Pennsylvania |
| 4 | Ada Shaffer | 42 | Wife | — | Pennsylvania |
| 5 | Agnes Shaffer | 20 | Daughter | Collector | Pennsylvania |
| 6 | Evelyn Shaffer | 18 | Daughter | — | Pennsylvania |
| 7 | Syllian Shaffer | 16 | Daughter | — | Pennsylvania |
| 8 | Frances Shaffer | 15 | Daughter | — | Pennsylvania |
| 9 | Mary Lou Shaffer THIS PERSON | 12 | Daughter | — | Pennsylvania |
| 10 | Alonzo Shaffer | 10 | Son | — | Pennsylvania |
| 11 | Edgar Shaffer | 8 | Son | — | Pennsylvania |
| 12 | Sarah Ellen Shaffer | 6 | Daughter | — | Pennsylvania |
| 13 | Charles Boyce | 47 | Head | Laborer | Pennsylvania |
| 14 | Florence Boyce | 33 | Wife | — | Pennsylvania |
| 15 | William Boyce | 16 | Son | — | Pennsylvania |
| 16 | Florence Boyce | 14 | Daughter | — | Pennsylvania |
| 17 | Orpha Boyce | 12 | Daughter | — | Pennsylvania |
| 18 | George Boyce | 8 | Son | — | Pennsylvania |
| 19 | Ida May Boyce | 5 | Daughter | — | Pennsylvania |
| 20 | Virginia Boyce | 3 | Daughter | — | Pennsylvania |
| 21 | David Boyce | 0 | Son | — | Pennsylvania |
| 22 | Allen Byrd | 79 | Head | — | West Virginia |
| 23 | Roy Byrd | 26 | Son | Laborer | West Virginia |
| 24 | Matilda Byrd | 37 | Daughter | — | Pennsylvania |
| 25 | Lloyd Haynes | 42 | Head | Caretaker | Pennsylvania |
| 26 | Zella Haynes | 38 | Wife | — | Pennsylvania |
| 27 | Frederick Haynes | 18 | Son | Laborer | Pennsylvania |
| 28 | Doris Haynes | 16 | Daughter | — | Pennsylvania |
| 29 | Edwin Haynes | 14 | Son | — | Pennsylvania |
| 30 | Marshal Cupp | 70 | Head | — | West Virginia |
| 31 | Mary Cupp | 60 | Wife | — | Austria |
| 32 | Frank White | 41 | Head | Farmer | Pennsylvania |
| 33 | Edna White | 40 | Wife | — | Pennsylvania |
| 34 | Thomas White | 19 | Son | Laborer | Pennsylvania |
| 35 | Frank William White | 15 | Son | — | Pennsylvania |
| 36 | John White | 12 | Son | — | Pennsylvania |
| 37 | Edna White | 8 | Daughter | — | Pennsylvania |
| 38 | Stanley White | 2 | Son | — | Pennsylvania |
| 39 | Gus Pershing | 61 | Head | Farmer | Germany |
| 40 | Agnes Pershing | 61 | Wife | — | West Virginia |
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)