JB
John Black — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mercer-County, New Jersey
Our Model Tree links this John Black across the 1920, 1930 and 1940 US Censuses in Mercer-County, New Jersey (XGBoost, ~Confirmed), with identified parents John & Jessie — first a head (b.~1900), then head of a 6-person household.
Age 40
b. ~1900
Male
Head
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, New Jersey |
| Surname | Black |
| Given Name | John |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Trenton |
| 1935 Residence (County) | Mercer |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Janitor |
| Industry | Y.M.C.A. |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 740 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Janitor |
| Township / Ward | Trenton |
| Est. Birth Year | ~1900 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Janet Black | Daughter | — | 4 | ~1936 |
| John Black | Head | — | 40 | ~1900 |
| Alfred Black | Son | — | 12 | ~1928 |
| Gerald Black | Son | — | 8 | ~1932 |
| John Black | Son | — | 15 | ~1925 |
| Julia Black | Spouse | — | 37 | ~1903 |
Census Appearances
1920
Mercer, New …
Son, age 22
Mercer, New Jersey · implied b. ~1898 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Black |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Scotland |
| Year of Immigration | 1902 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Machinist |
| Industry | Wire Mill |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Year of Naturalization | 1919 |
| Birthplace (normalized) | scotland |
1930
Mercer, New …
Head, age 30
Mercer, New Jersey · implied b. ~1900 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Black |
| Given Name | John G. Jr. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1904 |
| Age at First Marriage | 23 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Janitor |
| Industry | YWCA |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 25 |
| Radio Set | R |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Mercer-County, New …
Head, age 40
Mercer-County, New Jersey · implied b. ~1900 — 6 household members
| Surname | Black |
| Given Name | John |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Trenton |
| 1935 Residence (County) | Mercer |
| Naturalization Status | Naturalized |
| Occupation | Janitor |
| Industry | Y.M.C.A. |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 740 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Black across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Black (~0.92 confidence) and mother Jessie Black (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Black
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Jessie Black
b. ~1873
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Black
Head · 1940 · age 40 · b. ~1900 · New Jersey
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Mercer-County, New Jersey
Open full size
1940 US Federal Census — Mercer-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02356-00670)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Gustav Koty | 36 | head | Machinist | Germany |
| 42 | Ida Koty | 34 | wife | — | Germany |
| 43 | Ethel Koty | 9 | daughter | — | New Jersey |
| 44 | Carl Koty | 4 | son | — | New Jersey |
| 45 | Albert Frank | 40 | head | Foreman | New Jersey |
| 46 | Mary Frank | 43 | wife | — | England |
| 47 | Albert Jr Frank | 20 | son | Helper | New Jersey |
| 48 | William Ketterer | 60 | head | Butcher | New Jersey |
| 49 | Lena Ketterer | 49 | wife | — | New Jersey |
| 50 | Ketterer | None | — | — | — |
| 51 | August Frank | 73 | head | Farmer | Germany |
| 52 | Anna Frank | 72 | wife | — | Germany |
| 53 | Anna Frank | 29 | daughter | File Clerk | New Jersey |
| 54 | Lee Winter | 39 | head | Producer | Pennsylvania |
| 55 | Anna Winter | 33 | wife | Housekeeper | Pennsylvania |
| 56 | Robert Winter | 12 | son | — | New Jersey |
| 57 | Saniero Perry | 63 | head | Laborer | Italy |
| 58 | Palmera Perry | 55 | wife | — | Italy |
| 59 | Aldo Perry | 24 | son | Helper | New Jersey |
| 60 | Philip Fostee | Foster | 24 | lodger | Laborer | Italy |
| 61 | Harry North | 51 | head | Laborer | New Jersey |
| 62 | Victoria North | 36 | wife | — | New York |
| 63 | Harry North | 15 | son | — | New Jersey |
| 64 | George North | 6 | son | — | New Jersey |
| 65 | Charles Wood | 19 | head | Laborer | New York |
| 66 | Audrey Wood | 13 | wife | — | New York |
| 67 | Edith Wood | 13 | step-dau | — | New York |
| 68 | Ethel Wood | 10 | step-dau | — | New York |
| 69 | Forest Welles | 27 | head | Laborer | Georgia |
| 70 | Blanche Welles | 23 | wife | — | Georgia |
| 71 | John Cole | 40 | head | Body Builder | Newfoundland |
| 72 | Greta Cole | 30 | wife | — | New Jersey |
| 73 | John Cole | 10 | son | — | New Jersey |
| 74 | James Cole | 8 | son | — | New Jersey |
| 75 | John Black THIS PERSON | 40 | head | Janitor | Scotland |
| 76 | Julia Black | 37 | wife | — | New Jersey |
| 77 | John Black | 15 | son | — | New Jersey |
| 78 | Alfred Black | 12 | son | — | New Jersey |
| 79 | Gerald Black | 8 | son | — | New Jersey |
| 80 | Janet Black | 4 | daughter | — | New Jersey |
Pedigree Summary
John
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)