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John Jenkins — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Jenkins across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Jemima & John — first a son (b.~1920), then head of a 3-person household.
Age 20
b. ~1920
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Jenkins |
| Given Name | John Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Cook |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Est. Birth Year | ~1920 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Jenkins | Head | — | 48 | ~1892 |
| John Jenkins | Son | — | 20 | ~1920 |
| Grace Jenkins | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Cook, Illinois
Son, age
Cook, Illinois · implied b. ~1920 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jenkins |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Cook, Illinois
Son, age 10
Cook, Illinois · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jenkins |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Cook-County, Illinois
Son, age 20
Cook-County, Illinois · implied b. ~1920 — 3 household members
| Surname | Jenkins |
| Given Name | John Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Cook |
| 1935 Residence (County) | Cook |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 Jenkins across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Jemima Jenkins (~0.84 confidence) and father John Jenkins (~0.92 confidence) and father John Jenkins (~0.92 confidence) and mother Grace Jenkins (~0.92 confidence) and mother Grace Jenkins (~0.92 confidence) and mother Grace Jenkins (~0.92 confidence). The pedigree spans 2 generations with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.91
Mother
Jemima Jenkins
b. ~1884
Source mother>mother
● Household
· direct · ~0.84
Father
John Jenkins
b. ~1893
Source father
● Household
· direct · ~0.92
Father
John Jenkins
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Grace Jenkins
b. ~1893
Source mother
● Household
· direct · ~0.92
Mother
Grace Jenkins
b. ~1898
Source mother
● Household
· direct · ~0.92
Mother
Grace Jenkins
b. ~1900
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Jenkins
Son · 1940 · age 20 · b. ~1920 · Illinois
★ 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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01022-00169)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Catherine Carpenter | 23 | daughter | Waitress | Illinois |
| 2 | Janet Carpenter | 16 | daughter | Office Worker | Illinois |
| 3 | Ralf L. Sanders | 52 | Head | Civil Engineer | Illinois |
| 4 | Agnes L. Sanders | 44 | wife | Supervisor | Wisconsin |
| 5 | Minnie Sprague | 60 | step mother | Housekeeper | Illinois |
| 6 | Edward Ryan | 31 | Head | Buyer | Illinois |
| 7 | Patricia Q. Ryan | 25 | wife | — | Illinois |
| 8 | Robert Ryan | 1 | son | — | Illinois |
| 9 | Victor Sawyer | 34 | Head | Salesman | Illinois |
| 10 | Elva Sawyer | 28 | wife | — | Michigan |
| 11 | Curtis Massey | 29 | Head | Radio Artist | Texas |
| 12 | Edythe Massey | 28 | wife | — | Kansas |
| 13 | Richard Geaslen | 24 | Head | Employer | Illinois |
| 14 | Hazel A. Geaslen | 27 | wife | — | Illinois |
| 15 | Charles Stevens | 33 | Head | Service Man | Illinois |
| 16 | Virginia Q. Stevens | 29 | wife | — | Illinois |
| 17 | Robert C. Stevens | 2 | son | — | California |
| 18 | Carl E. Frank | 31 | Head | Contractor | Wisconsin |
| 19 | Josephine P. Frank | 24 | wife | — | Illinois |
| 20 | Robert Frank | 3 | son | — | Illinois |
| 21 | Gus L. Russell | 42 | Head | Sales Manager | Canada-Eng |
| 22 | Nellie B. Russell | 31 | wife | — | Kentucky |
| 23 | Robert Russell | 4 | son | — | Ohio |
| 24 | Joseph Krotrich | 50 | Head | Dentist | Minnesota |
| 25 | Elizabeth B. Krotrich | 41 | wife | — | Illinois |
| 26 | Bettina J. Krotrich | 15 | daughter | — | Illinois |
| 27 | Joseph Krotrich | 10 | son | — | Illinois |
| 28 | Yvonne Krotrich | 3 | daughter | — | Illinois |
| 29 | E. A. Herrick | 61 | Head | Salesman | Illinois |
| 30 | Teonya (Aln) Herrick | 60 | wife | — | Illinois |
| 31 | T. L. Herrick | 27 | son | Salesman | Illinois |
| 32 | Winifred Herrick | 21 | daughter-in-law | Receptionist | Illinois |
| 33 | Elizabeth Wilson | 60 | housekeeper | Housekeeper | Michigan |
| 34 | Edward Merkel | 47 | Head | Freight Agent | Kentucky |
| 35 | Alice S. Merkel | 40 | wife | — | Kentucky |
| 36 | Edward J. Merkel | 18 | son | — | Kentucky |
| 37 | John P. Jenkins | 48 | Head | Proprietor | Indiana |
| 38 | Grace O. Jenkins | 42 | wife | — | Illinois |
| 39 | John Jr. Jenkins THIS PERSON | 20 | son | — | Indiana |
| 40 | Arthur E. Schneider | 35 | Head | Chemist | Connecticut |
Pedigree Summary
John
Gen 1 · 5 parents
~0.92
Gen 2 · 1 grandparents
~0.84
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)