MF
Mary Frederick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Washington-County, Pennsylvania
Our Model Tree links this Mary Frederick across the 1930 and 1940 US Censuses in Washington-County, Pennsylvania (XGBoost, ~Confirmed) — first a spouse (b.~1886), then head of a 8-person household.
Age 54
b. ~1886
Female
Spouse
Born: France
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Washington-County, Pennsylvania |
| Surname | Frederick |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | France |
| 1935 Residence (City) | Monongahela |
| 1935 Residence (County) | Washington |
| Naturalization Status | Naturalized |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth Country | France |
| Birthplace (normalized) | france |
| Township / Ward | Monongahela |
| Est. Birth Year | ~1886 |
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 |
|---|---|---|---|---|
| Martha Frederick | Daughter | — | 16 | ~1924 |
| Angelina Frederick | Daughter | — | 13 | ~1927 |
| Mary Frederick | Spouse | — | 54 | ~1886 |
| James Frederick | Head | — | 54 | ~1886 |
| Pete Fammi | Other | — | 61 | ~1879 |
| Anthony Frederick | Son | — | 22 | ~1918 |
| John Frederick | Son | — | 19 | ~1921 |
| Mary Frederick | Daughter | — | 9 | ~1931 |
Census Appearances
1930
Washington, Pennsylvania
Spouse, age 42
Washington, Pennsylvania · implied b. ~1888 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | France |
| Naturalization Status | Alien |
| Year of Immigration | 1906 |
| Age at First Marriage | 27 |
| Father's Birthplace | France |
| Mother's Birthplace | France |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Birth Country | France |
| Birthplace (normalized) | france |
1940
Washington-County, Pennsylvania
Spouse, age 54
Washington-County, Pennsylvania · implied b. ~1886 — 8 household members
| Surname | Frederick |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | France |
| 1935 Residence (City) | Monongahela |
| 1935 Residence (County) | Washington |
| Naturalization Status | Naturalized |
| Hours Worked | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth Country | France |
| Birthplace (normalized) | france |
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 Frederick across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Frederick
Spouse · 1940 · age 54 · b. ~1886 · Pennsylvania
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Washington-County, Pennsylvania
Open full size
1940 US Federal Census — Washington-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03624-00368)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Caroline Pugrielle | 43 | wife | — | Italy |
| 42 | James Frederick | 54 | head | Section Hand | Italy |
| 43 | Mary Frederick THIS PERSON | 54 | wife | — | France |
| 44 | Anthony Frederick | 22 | son | New Worker | Pennsylvania |
| 45 | John Frederick | 19 | son | Laborer | Pennsylvania |
| 46 | Martha Frederick | 16 | daughter | — | Pennsylvania |
| 47 | Angelina Frederick | 13 | daughter | — | Pennsylvania |
| 48 | Mary Frederick | 9 | daughter | — | Pennsylvania |
| 49 | Pete Fammi | 61 | lodger | Miner | Italy |
| 50 | Mark Bartoletti | 62 | head | Miner | Italy |
| 51 | Louise Bartoletti | 59 | wife | — | Austria |
| 52 | Mark Bartoletti | 36 | son | Machine Operator | Pennsylvania |
| 53 | Edith Bartoletti | 18 | daughter | — | Pennsylvania |
| 54 | Joseph Ferlin | 20 | stepson | Tube Bender | Pennsylvania |
| 55 | Eugene Cerenelli | 30 | son-in-law | Electric Welder | Pennsylvania |
| 56 | Lillian Cerenelli | 27 | daughter | — | Pennsylvania |
| 57 | John Vogini | 14 | head | — | Italy |
| 58 | John Illonolia | 62 | head | Miner | Italy |
| 59 | Catherine Illonolia | 58 | wife | — | Italy |
| 60 | John Illonolia | 26 | son | Section Hand | Pennsylvania |
| 61 | Louis Illonolia | 22 | son | Laborer | Pennsylvania |
| 62 | William Illonolia | 14 | son | New Worker | Pennsylvania |
| 63 | Hazel Leyda | 41 | head | — | Pennsylvania |
| 64 | Harold Leyda | 17 | son | New Worker | Pennsylvania |
| 65 | Harry Leyda | 19 | son | Labor | Pennsylvania |
| 66 | Clarence Leyda | 15 | son | — | Pennsylvania |
| 67 | Anna Leyda | 12 | daughter | — | Pennsylvania |
| 68 | Irma Leyda | 8 | daughter | — | Pennsylvania |
| 69 | Jack Partizana | 36 | head | Bannerman | Pennsylvania |
| 70 | Frank Partizana | 12 | son | — | Pennsylvania |
| 71 | Jack G. Partizana | 2 | son | — | Pennsylvania |
| 72 | Frank Kozon | 52 | head | Labor | Poland |
| 73 | Anna Kozon | 59 | wife | — | Poland |
| 74 | John Kozon | 24 | son | Trucker | Pennsylvania |
| 75 | Mary Kozon | 24 | daughter | Waitress | Pennsylvania |
| 76 | Stanley Kozon | 14 | son | Labor | Pennsylvania |
| 77 | Louise Kozon | 12 | daughter | — | Pennsylvania |
| 78 | Anthony Defazio | 33 | head | Labor | Pennsylvania |
| 79 | Mary Defazio | 27 | wife | — | Pennsylvania |
| 80 | Betty Defazio | 6 | daughter | — | 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)