JH
John Hendrickson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mercer-County, New Jersey
Our Model Tree links this John Hendrickson across the 1920, 1930 and 1940 US Censuses in Mercer-County, New Jersey (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Male
Son
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, New Jersey |
| Surname | Hendrickson |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | West Windsor Township |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Occupation | Civil Engineer |
| Industry | Construction |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 780 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Civil Engineer |
| Township / Ward | West Windsor Township |
| Est. Birth Year | ~1919 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Hendrickson | Head | — | 49 | ~1891 |
| Sarah Hendrickson | Other | — | 82 | ~1858 |
| Daryn Hendrickson | Son | — | 13 | ~1927 |
| Alice Hendrickson | Spouse | — | 47 | ~1893 |
| John Hendrickson | Son | — | 21 | ~1919 |
Census Appearances
1920
Mercer, New …
Other, age 1
Mercer, New Jersey · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hendrickson |
| Given Name | John H. Jr. |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New York |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Mercer, New …
Son, age 11
Mercer, New Jersey · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hendrickson |
| Given Name | John G. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New York |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Mercer-County, New …
Son, age 21
Mercer-County, New Jersey · implied b. ~1919 — 5 household members
| Surname | Hendrickson |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | West Windsor Township |
| 1935 Residence (County) | Mercer |
| Occupation | Civil Engineer |
| Industry | Construction |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 780 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| 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 John Hendrickson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Hendrickson (~0.92 confidence) and father John Hendrickson (~0.92 confidence) and father John Hendrickson (~0.83 confidence) and mother Sarah Hendrickson (~0.83 confidence) and mother Alice Hendrickson (~0.92 confidence). The pedigree spans 2 generations with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.88
Father
John Hendrickson
b. ~1891
Source father
● Household
· direct · ~0.92
Father
John Hendrickson
b. ~1895
Source father
● Household
· direct · ~0.92
Father
John Hendrickson
b. ~1860
Source father>father
● Household
· direct · ~0.83
Mother
Sarah Hendrickson
b. ~1860
Source father>mother
● Household
· direct · ~0.83
Mother
Alice Hendrickson
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Hendrickson
Son · 1940 · age 21 · b. ~1919 · New Jersey
★ You are viewing this record
Sibling
Daryn Hendrickson
Sibling · 1940 · age 13
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-t0627-02357-00844)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Margaret Hogarty | 9 | Son | — | New Jersey |
| 42 | Ruth J Hogarty | 4 | Daughter | — | New Jersey |
| 43 | Jessie J Beats | 77 | Head | — | Pennsylvania |
| 44 | John Hendrickson | 49 | Head | Janitor | New Jersey |
| 45 | Alice E Hendrickson | 47 | Wife | — | New Jersey |
| 46 | John Hendrickson THIS PERSON | 21 | Son | Civil Engineer | New Jersey |
| 47 | Daryn W Hendrickson | 13 | Son | — | New Jersey |
| 48 | Sarah J Hendrickson | 82 | Mother | — | New Jersey |
| 49 | John Witherspoon | 34 | Head | Proprietor | New Jersey |
| 50 | Harriette Witherspoon | 30 | Wife | — | Georgia |
| 51 | Dianna Witherspoon | 4 | Daughter | — | New Jersey |
| 52 | David Witherspoon | 1 | Son | — | New Jersey |
| 53 | Samuel Opdyke | 52 | Head | Salesman | Pennsylvania |
| 54 | Mabel Opdyke | 53 | Wife | — | Pennsylvania |
| 55 | Edward W Woodhams | 33 | Head | Salesman | New York |
| 56 | Jessie A Woodhams | 29 | Wife | — | Scotland |
| 57 | Vernon H Stevens | 27 | Head | Teller | New Jersey |
| 58 | Marion C Stevens | 25 | Wife | — | Pennsylvania |
| 59 | J. Barnet Pessa | 55 | Head | Farmer | Russia |
| 60 | Molly Pessa | 52 | Wife | — | Russia |
| 61 | Irving Pessa | 28 | Son | Truck Driver | New York |
| 62 | George E Coward | 62 | Head | Farmer | New Jersey |
| 63 | Estella E Coward | 58 | Wife | — | New Jersey |
| 64 | Herbert R Coward | 33 | Son | Clerk | New Jersey |
| 65 | Michael C Tmeula | 54 | Head | Janitor | Czechoslovakia |
| 66 | Anna Tmeula | 50 | Wife | — | Czechoslovakia |
| 67 | Helen A Tmeula | 19 | Daughter | Clerk | New Jersey |
| 68 | Mildred E Tmeula | 17 | Daughter | — | New Jersey |
| 69 | John C Tmeula | 14 | Son | — | New Jersey |
| 70 | Doris E Tmeula | 13 | Daughter | — | New Jersey |
| 71 | George W Tmeula | 10 | Son | — | New Jersey |
| 72 | William Baikie | 60 | Head | Farmer | Scotland |
| 73 | Mary Baikie | 56 | Wife | — | Scotland |
| 74 | William D Baikie | 29 | Son | Laborer | New Jersey |
| 75 | Flora J Baikie | 27 | Daughter | Nurse | New Jersey |
| 76 | Neil J Baikie | 25 | Son | Laborer | New Jersey |
| 77 | Ian A Baikie | 22 | Son | Laborer | New Jersey |
| 78 | William E Stives | 63 | Head | — | New York |
| 79 | Anna Stives | 63 | Wife | — | Pennsylvania |
| 80 | Harry Stives | 41 | Son | Laborer | New Jersey |
Pedigree Summary
John + 1 sibling
Gen 1 · 3 parents
~0.92
Gen 2 · 2 grandparents
~0.83
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)