WF
William Frederick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this William Frederick across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1916), then head of a 7-person household.
Age 24
b. ~1916
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Frederick |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | West View Boro. |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Mechanic Helper |
| Industry | Heating |
| Class of Worker | PW |
| Hours Worked | 15 |
| Income (1939) | 390 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Mechanic Helper |
| Township / Ward | West View Boro |
| Est. Birth Year | ~1916 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Robert Frederick | Son | — | 3 | ~1937 |
| William Frederick | Head | — | 52 | ~1888 |
| William Frederick | Son | — | 24 | ~1916 |
| Anna Frederick | Daughter | — | 17 | ~1923 |
| Herbert Frederick | Son | — | 6 | ~1934 |
| Joseph Frederick | Son | — | 9 | ~1931 |
| Mary Frederick | Spouse | — | 43 | ~1897 |
Census Appearances
1930
Allegheny, Pennsylvania
Son, age 14
Allegheny, Pennsylvania · implied b. ~1916 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Scotland |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Son, age 24
Allegheny-County, Pennsylvania · implied b. ~1916 — 7 household members
| Surname | Frederick |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | West View Boro. |
| 1935 Residence (County) | Allegheny |
| Occupation | Mechanic Helper |
| Industry | Heating |
| Class of Worker | PW |
| Hours Worked | 15 |
| Income (1939) | 390 |
| Highest Grade | 8 |
| 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 William Frederick across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Frederick
Son · 1940 · age 24 · b. ~1916 · Pennsylvania
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Sibling
Anna Frederick
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herbert Frederick
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Frederick
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Frederick
Sibling · 1940 · age 9
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
39 people indexed on this census page (nara:1940:m-t0627-03420-00636)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 2 | Paul S. Tosh | 46 | Head | Meter Reader | Pennsylvania |
| 3 | Rose A. Tosh | 43 | Wife | — | Pennsylvania |
| 4 | Rose M. Tosh | 15 | Daughter | — | Pennsylvania |
| 5 | Charles Tosh | 11 | Son | — | Pennsylvania |
| 6 | John Messina | 45 | Lodger | — | Pennsylvania |
| 7 | Charles Graff | 14 | Lodger | — | Pennsylvania |
| 8 | Albert O. Shugert | 48 | Head | Salesman | Pennsylvania |
| 9 | Freda B. Shugert | 43 | Wife | — | Pennsylvania |
| 10 | Albert C. Shugert | 23 | Son | Radio Operator | Pennsylvania |
| 11 | Bertha A. Evans | 52 | Head | — | Pennsylvania |
| 12 | Ralph J. Evans | 32 | Son | Carpenter | Pennsylvania |
| 13 | Helen Evans | 23 | Daughter-in-law | — | Pennsylvania |
| 14 | Ruth Pierce | 28 | Daughter | — | Pennsylvania |
| 15 | James A. Pierce | 33 | Son-in-law | Engineer | Pennsylvania |
| 16 | James R. Pierce | 4 | Grandson | — | Pennsylvania |
| 17 | Christ C. Oberst | 42 | Head | Sheet Metal Worker | Pennsylvania |
| 18 | Alice K. Oberst | 40 | Wife | — | Pennsylvania |
| 19 | Mary Oberst | 16 | Daughter | — | Pennsylvania |
| 20 | William F. Frederick | 52 | Head | Owner | Pennsylvania |
| 21 | Mary Frederick | 43 | Wife | — | Pennsylvania |
| 22 | William Frederick THIS PERSON | 24 | Son | Mechanic Helper | Pennsylvania |
| 23 | Anna M. Frederick | 17 | Daughter | — | Pennsylvania |
| 24 | Joseph Frederick | 9 | Son | — | Pennsylvania |
| 25 | Herbert Frederick | 6 | Son | — | Pennsylvania |
| 26 | Robert Frederick | 3 | Son | — | Pennsylvania |
| 27 | Chas. Clement Fischer | 61 | Head | Pharmacist | Pennsylvania |
| 28 | Margaret C. Fischer | 54 | Wife | — | Pennsylvania |
| 29 | George C. Collins | 46 | Head | Production Mgr. | Pennsylvania |
| 30 | Annie C. Collins | 40 | Wife | — | Pennsylvania |
| 31 | Frank Vogt | 79 | Head | — | Germany |
| 32 | Wilhelmina Vogt | 69 | Wife | — | Germany |
| 33 | John Reber | 60 | Head | Salesman | Pennsylvania |
| 34 | Marie Reber | 59 | Wife | — | France |
| 35 | Raymond Reber | 18 | Son | — | Pennsylvania |
| 36 | Raymond A. Massey | 46 | Head | Chauffeur | Pennsylvania |
| 37 | Emma Massey | 44 | Wife | — | Pennsylvania |
| 38 | Raymond Massey | 18 | Son | — | Pennsylvania |
| 39 | Ruth Massey | 16 | Daughter | — | Pennsylvania |
| 40 | Gotthilf Zinser | 52 | Head | Tool & Die Maker | Germany |
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)