JF
John Frederick — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Allegheny, Pennsylvania
Our Model Tree links this John Frederick across the 1920, 1930 and 1940 US Censuses in Allegheny, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1892), then head of a 4-person household.
Age 38
b. ~1892
Male
Head
Born: Pennsylvania
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Allegheny, Pennsylvania |
| Surname | Frederick |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 26 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Additional Details | |
| Occupation | Laborer |
| Industry | Steel Mill |
| Class of Worker | W |
| Can Read/Write | No |
| Home Owned/Rented | R |
| Home Value / Rent | 20.00 |
| Radio Set | R |
| Veteran | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Laborer |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1892 |
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.
4 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Robert Frederick | Son | — | 4 | ~1926 |
| John Frederick | Head | — | 38 | ~1892 |
| Mary Frederick | Spouse | — | 33 | ~1897 |
| John Frederick | Son | — | 11 | ~1919 |
Census Appearances
1920
Allegheny, Pennsylvania
Head, age 26
Allegheny, Pennsylvania · implied b. ~1894 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | John R |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Physician |
| Industry | Own business |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Head, age 38
Allegheny, Pennsylvania · implied b. ~1892 — 4 household members
| Surname | Frederick |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 26 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Laborer |
| Industry | Steel Mill |
| Class of Worker | W |
| Can Read/Write | No |
| Home Owned/Rented | R |
| Home Value / Rent | 20.00 |
| Radio Set | R |
| Veteran | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Head, age 47
Allegheny-County, Pennsylvania · implied b. ~1893 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederic |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | ALLEGHENY |
| Occupation | Physician |
| Industry | Medical |
| Class of Worker | OA |
| Hours Worked | 32 |
| Income (1939) | 5000 |
| Highest Grade | C 5-8 |
| 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 John Frederick across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Frederick
Head · 1930 · age 38 · b. ~1892 · Pennsylvania
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Allegheny, Pennsylvania
Open full size
1930 US Federal Census — Allegheny, Pennsylvania
Page Contents
49 people indexed on this census page (ia:1930:fifteenthcensus00reel1978:0857)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Hess | 21 | Head | Laborer | Pennsylvania |
| 2 | Helen Hess | 20 | Wife | — | Pennsylvania |
| 3 | John Jr. Hess | 1 | Son | — | Pennsylvania |
| 4 | Robert Hess | 0 | Son | — | Pennsylvania |
| 5 | Mary Hess | 47 | Mother | — | Pennsylvania |
| 6 | Anna Hess | 27 | Sister | Saleslady | Pennsylvania |
| 7 | Margaret Hess | 17 | Sister | Stenographer | Pennsylvania |
| 8 | William Hess | 56 | Brother | Clerk | Pennsylvania |
| 9 | John Kozlowski | 50 | Head | Laborer | Poland |
| 10 | Mary Kozlowski | 45 | Wife | — | Poland |
| 11 | John Jr. Kozlowski | 23 | Son | Laborer | Pennsylvania |
| 12 | Stanley Kozlowski | 21 | Son | Laborer | Pennsylvania |
| 13 | Helen Kozlowski | 11 | Daughter | — | Pennsylvania |
| 14 | Edward Kozlowski | 3 | Son | — | Pennsylvania |
| 15 | John Frederick THIS PERSON | 38 | Head | Laborer | Pennsylvania |
| 16 | Mary Frederick | 33 | Wife | — | Pennsylvania |
| 17 | John Jr. Frederick | 11 | Son | — | Pennsylvania |
| 18 | Robert Frederick | 4 | Son | — | Pennsylvania |
| 19 | William Frederick | 63 | Head | — | Pennsylvania |
| 20 | Elizabeth Frederick | 62 | Wife | — | Pennsylvania |
| 21 | William Jr. Frederick | 35 | Son | Laborer | Pennsylvania |
| 22 | George Frederick | 25 | Son | Laborer | England |
| 23 | Charles Frederick | 21 | Son | Laborer | Pennsylvania |
| 24 | Helen Frederick | 16 | Daughter | — | Pennsylvania |
| 25 | Ruth Frederick | 14 | Daughter | — | Pennsylvania |
| 26 | Dorothy Frederick | 12 | Daughter | — | Pennsylvania |
| 27 | Mary Griffith | 68 | Head | — | Pennsylvania |
| 28 | John Griffith | 30 | Son | Laborer | Pennsylvania |
| 29 | Kenneth Coyne | 28 | Head | Commercial Trav. | Pennsylvania |
| 30 | Margaret Coyne | 28 | Wife | — | Pennsylvania |
| 31 | Dolores Coyne | 15 | Sister | — | Pennsylvania |
| 32 | Sarah Thiel | 65 | Head | Practical Nurse | Maryland |
| 33 | Mildred Thiel | 15 | Daughter | — | Pennsylvania |
| 34 | John Darcy | 43 | Head | Police Officer | Irish Free State |
| 35 | Mary Darcy | 36 | Wife | — | Irish Free State |
| 36 | David Darcy | 5 | Son | — | Pennsylvania |
| 37 | Thomas Darcy | 2 | Son | — | Pennsylvania |
| 38 | James Neil | 43 | Head | Core Maker | Scotland |
| 39 | Josephine Neil | 48 | Wife | — | England |
| 40 | Mary Neil | 21 | Daughter | — | Pennsylvania |
| 41 | Hubert Schiefer | 35 | Head | Laborer | Pennsylvania |
| 42 | Emma Schiefer | 35 | Wife | — | Pennsylvania |
| 43 | William Schiefer | 6 | Son | — | Pennsylvania |
| 44 | Daniel Mcintyre | 26 | Head | Laborer | Pennsylvania |
| 45 | Annie Mcintyre | 59 | Mother | — | Irish Free State |
| 46 | Donald Wroble | 26 | Head | Chauffeur | Ohio |
| 47 | Emily Wroble | 26 | Wife | — | Ohio |
| 48 | Jane Wroble | 1 | Daughter | — | Pennsylvania |
| 49 | James Henning | 32 | Head | Chauffeur | Pennsylvania |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)