JF
John Frederick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Wayne-County, Michigan
Our Model Tree links this John Frederick across the 1930 and 1940 US Censuses in Wayne-County, Michigan (XGBoost, ~Confirmed) — first a head (b.~1885), then head of a 7-person household.
Age 55
b. ~1885
Male
Head
Born: Poland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Wayne-County, Michigan |
| Surname | Frederick |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Machinist |
| Industry | Auto factory |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 1100 |
| Highest Grade | No 3 |
| 1935 Residence | Same house |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Occupation | Machinist |
| Township / Ward | Detroit City |
| Est. Birth Year | ~1885 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Catherine Frederick | Spouse | — | 52 | ~1888 |
| Edward Frederick | Son | — | 14 | ~1926 |
| John Frederick | Son | — | 28 | ~1912 |
| Stanley Frederick | Son | — | 25 | ~1915 |
| Joseph Frederick | Son | — | 16 | ~1924 |
| Helen Frederick | Daughter | — | 21 | ~1919 |
| John Frederick | Head | — | 55 | ~1885 |
Census Appearances
1930
Wayne, Michigan
Head, age 45
Wayne, Michigan · implied b. ~1885 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1910 |
| Age at First Marriage | 25 |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Welder |
| Industry | Auto Shop |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Home Owned/Rented | R |
| Home Value / Rent | 25 |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
1940
Wayne-County, Michigan
Head, age 55
Wayne-County, Michigan · implied b. ~1885 — 7 household members
| Surname | Frederick |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Naturalization Status | Naturalized |
| Occupation | Machinist |
| Industry | Auto factory |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 1100 |
| Highest Grade | No 3 |
| 1935 Residence | Same house |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Frederick
Head · 1940 · age 55 · b. ~1885 · Michigan
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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 — Wayne-County, Michigan
Open full size
1940 US Federal Census — Wayne-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01861-00865)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helen Galanty | 11 | Daughter | — | Michigan |
| 2 | Edward Muzkiewicz | 18 | Step-son | Floor Worker | Michigan |
| 3 | Frank Pniewski | 37 | Head | Welder | Michigan |
| 4 | Rose Pniewski | 34 | Wife | — | Michigan |
| 5 | Jerome Pniewski | 12 | Son | — | Michigan |
| 6 | Shirley Pniewski | 6 | Daughter | — | Michigan |
| 7 | Margret Pniewski | 3 | Daughter | — | Michigan |
| 8 | William Kurax | 31 | Lodger | Tool Grinder | Michigan |
| 9 | John Gorski | 59 | Head | Cement Finisher | Poland |
| 10 | May Gorski | 52 | Wife | — | Poland |
| 11 | Marian Kozinski | 25 | Head | Sprayer | Michigan |
| 12 | Helen Kozinski | 24 | Wife | — | Connecticut |
| 13 | Leonard Lucas | 32 | Brother-in-law | Investigator | Connecticut |
| 14 | Ann Lucas | 24 | Sister-in-law | — | Michigan |
| 15 | Marion J. Habowski | 45 | Head | Handy Man | Poland |
| 16 | Helen Habowski | 38 | Wife | — | Michigan |
| 17 | Edwin Habowski | 13 | Son | — | Michigan |
| 18 | Rose M. Habowski | 6 | Daughter | — | Michigan |
| 19 | Anna Ring | 50 | Head | Seamstress | Sweden |
| 20 | Walter Ring | 19 | Son | — | Michigan |
| 21 | John Frederick THIS PERSON | 55 | Head | Machinist | Poland |
| 22 | Catherine Frederick | 52 | Wife | — | Poland |
| 23 | John Frederick | 28 | Son | Salesman | Pennsylvania |
| 24 | Stanley Frederick | 25 | Son | Machinist | Pennsylvania |
| 25 | Helen Frederick | 21 | Daughter | Waitress | Pennsylvania |
| 26 | Joseph Frederick | 16 | Son | — | Pennsylvania |
| 27 | Edward Frederick | 14 | Son | — | Michigan |
| 28 | Leon Kolka | 36 | Head | Salesman | Michigan |
| 29 | Theresa Kolka | 34 | Wife | — | Michigan |
| 30 | Thomas Kolka | 7 | Son | — | Michigan |
| 31 | Frances Hyde | 46 | Aunt | — | Michigan |
| 32 | Allen Hyde | 46 | Uncle | Purser | Indiana |
| 33 | Anthony Kowalski | 33 | Head | Grinder | Michigan |
| 34 | Mary Kowalski | 31 | Wife | — | Michigan |
| 35 | Anthony Jr. Kowalski | 11 | Son | — | Michigan |
| 36 | Theresa Kowalski | 10 | Daughter | — | Michigan |
| 37 | Joseph Kowalski | 7 | Son | — | Michigan |
| 38 | Patricia Kowalski | 5 | Daughter | — | Michigan |
| 39 | Barbara Kowalski | 1 | Daughter | — | Michigan |
| 40 | Michalina Wroblewska | 54 | Head | — | Poland |
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)