LJ
Leo Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mercer-County, New Jersey
Our Model Tree links this Leo Johnson across the 1930 and 1940 US Censuses in Mercer-County, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 7-person household.
Age 12
b. ~1928
Male
Son
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, New Jersey |
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Highest Grade | 4 |
| 1935 Residence | Same House |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Trenton |
| Est. Birth Year | ~1928 |
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 Leo | Age | Birth yr |
|---|---|---|---|---|
| John Johnson | Head | — | 49 | ~1891 |
| Francis Johnson | Son | — | 15 | ~1925 |
| Joseph Johnson | Son | — | 23 | ~1917 |
| Edward Johnson | Son | — | 19 | ~1921 |
| Leo Johnson | Son | — | 12 | ~1928 |
| Mary Johnson | Spouse | — | 43 | ~1897 |
| Gerald Johnson | Son | — | 17 | ~1923 |
Census Appearances
1930
Mercer, New …
Son, age 1
Mercer, New Jersey · implied b. ~1929 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | son |
| Sex | M |
| Color / Race | Black |
| Age | 1 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | North Carolina |
| Mother's Birthplace | North Carolina |
| Occupation | none |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Mercer-County, New …
Son, age 12
Mercer-County, New Jersey · implied b. ~1928 — 7 household members
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton |
| 1935 Residence (County) | Mercer |
| Highest Grade | 4 |
| 1935 Residence | Same House |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 Leo Johnson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Leo Johnson
Son · 1940 · age 12 · b. ~1928 · New Jersey
★ You are viewing this record
Sibling
Gerald Johnson
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Johnson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Johnson
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Johnson
Sibling · 1940 · age 19
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 — 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-t0627-02356-00967)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ethel Hedden | 9 | Daughter | — | New Jersey |
| 2 | Douglas Hedden | 1 | Son | — | New Jersey |
| 3 | John P. Johnson | 49 | Head | Baker | New Jersey |
| 4 | Mary Johnson | 43 | Wife | — | Irish Free State |
| 5 | Joseph Johnson | 23 | Son | Laborer | New Jersey |
| 6 | Edward Johnson | 19 | Son | — | New Jersey |
| 7 | Gerald Johnson | 17 | Son | — | New Jersey |
| 8 | Francis Johnson | 15 | Son | — | New Jersey |
| 9 | Leo Johnson THIS PERSON | 12 | Son | — | New Jersey |
| 10 | Harry Chumar | 42 | Head | Oiler | New Jersey |
| 11 | Nettie Chumar | 42 | Wife | Maid | New Jersey |
| 12 | Charles Chumar | 18 | Son | Laborer | New Jersey |
| 13 | Marie Chumar | 14 | Daughter | — | New Jersey |
| 14 | Richard Chumar | 9 | Son | — | New Jersey |
| 15 | Vincenzo Lata | 52 | Head | Laborer | Italy |
| 16 | Maria Lata | 53 | Wife | — | Italy |
| 17 | Joseph Lata | 17 | Son | Laborer | Pennsylvania |
| 18 | Samuel Lata | 19 | Son | Laborer | Pennsylvania |
| 19 | Mike Lata | 23 | Son | Laborer | Pennsylvania |
| 20 | Rudolph Sandhoff | 64 | Head | — | Germany |
| 21 | Elizabeth Sandhoff | 62 | Wife | — | New Jersey |
| 22 | Ethel Sandhoff | 34 | Daughter | — | New Jersey |
| 23 | Clarence Sandhoff | 29 | Son | Bus Driver | New Jersey |
| 24 | Deborah Sandhoff | 26 | Daughter-in-law | — | New Jersey |
| 25 | Arlene Sandhoff | 5 | Granddaughter | — | New Jersey |
| 26 | Bernice Sandhoff | 4 | Granddaughter | — | New Jersey |
| 27 | Norma Sandhoff | 0 | Granddaughter | — | New Jersey |
| 28 | Charles Workland | 37 | Head | Rubber Worker | New Jersey |
| 29 | Charlotte Workland | 39 | Wife | — | New Jersey |
| 30 | Dolores Workland | 11 | Daughter | — | New Jersey |
| 31 | Charlotte Workland | 7 | Daughter | — | New Jersey |
| 32 | Shirley Workland | 6 | Daughter | — | New Jersey |
| 33 | Charles Jr. Workland | 0 | Son | — | New Jersey |
| 34 | Fred S. Seeds | 38 | Head | Painter | New Jersey |
| 35 | Rita Seeds | 28 | Wife | — | New Jersey |
| 36 | Fred Seeds | 14 | Son | — | New Jersey |
| 37 | Richard Seeds | 9 | Son | — | New Jersey |
| 38 | Anna Rank | 49 | Head | — | New Jersey |
| 39 | Clarence Eltonhead | 60 | Head | — | Rhode Island |
| 40 | Anna May Eltonhead | 44 | Wife | — | New Jersey |
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)