JL
John Lang — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Lang across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Marie & Joseph — first a head (b.~1897), then head of a 4-person household.
Age 43
b. ~1897
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Lang |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | General Inspector |
| Industry | Camera Mfg. Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | General Inspector |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1897 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Arline Lang | Daughter | — | 14 | ~1926 |
| John Lang | Head | — | 43 | ~1897 |
| John Lang | Son | — | 21 | ~1919 |
| Emma Lang | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Cook, Illinois
Son, age 23
Cook, Illinois · implied b. ~1897 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lang |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Fireman |
| Industry | Steam Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 33
Cook, Illinois · implied b. ~1897 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lang |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Painter |
| Industry | Painting |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 43
Cook-County, Illinois · implied b. ~1897 — 4 household members
| Surname | Lang |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | General Inspector |
| Industry | Camera Mfg. Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Lang across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Marie Lang (~0.92 confidence) and father Joseph Lang (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Marie Lang
b. ~1857
Source mother
● Household
· direct · ~0.92
Father
Joseph Lang
b. ~1859
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Lang
Head · 1940 · age 43 · b. ~1897 · 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-t0627-01002-00700)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ralph Johnson | 34 | Head | Salesman | Illinois |
| 2 | Opal Johnson | 31 | Wife | — | Illinois |
| 3 | Richard R. Johnson | 5 | Son | — | Illinois |
| 4 | Diane Johnson | 3 | Daughter | — | Illinois |
| 5 | Richard Fitzlaff | 55 | Father-in-law | Foreman | Germany |
| 6 | Clara Fitzlaff | 52 | Mother-in-law | — | Illinois |
| 7 | Harry Lange | 54 | Head | Yard Shipping Dept | Illinois |
| 8 | Florence Lange | 49 | Wife | — | North Dakota |
| 9 | Harold Lange | 26 | Son | Enrober | Illinois |
| 10 | John Lang THIS PERSON | 43 | Head | General Inspector | Illinois |
| 11 | Emma Lang | 42 | Wife | — | Illinois |
| 12 | John Jr. Lang | 21 | Son | Draftsman | Illinois |
| 13 | Arline Lang | 14 | Daughter | — | Illinois |
| 14 | Leo Wera | 51 | Head | Sheet Metal Worker | Minnesota |
| 15 | Julia Wera | 51 | Wife | — | Illinois |
| 16 | Leon Wera | 15 | Son | — | Illinois |
| 17 | Paul Rosemann | 78 | Head | — | Germany |
| 18 | Bertha Rosemann | 73 | Wife | — | Germany |
| 19 | Kurt Rosemann | 44 | Son | Teacher - Shop | Illinois |
| 20 | Bertha Rosemann | 33 | Daughter-in-law | Clerk | Illinois |
| 21 | Ernest G. R. Peterson | 66 | Head | — | Illinois |
| 22 | Douglas G. Peterson | 33 | Son | Engraver | Illinois |
| 23 | Joseph Gierzycki | 47 | Head | Iron Worker | Illinois |
| 24 | Mary Gierzycki | 49 | Wife | — | Poland |
| 25 | Mathilda Rohde | 70 | Head | — | Germany |
| 26 | Frank Rohde | 40 | Son | Bartender | Illinois |
| 27 | Stanley Koniewski | 44 | Head | Motorman | Illinois |
| 28 | Clara Koniewski | 35 | Wife | — | Illinois |
| 29 | William Longfield | 53 | Head | Butcher | Illinois |
| 30 | Martha Longfield | 55 | Wife | — | Illinois |
| 31 | Herman Longfield | 22 | Son | File Clerk | Illinois |
| 32 | Augusta Freehan | 75 | Head | — | Germany |
| 33 | James Gillette | 26 | Grandson | Lithographer | Indiana |
| 34 | Virginia Gillette | 22 | Granddaughter-in-law | In-Gatherer | Illinois |
| 35 | Gustav Kalenty | 45 | Head | Ornamental Iron | Austria |
| 36 | Anna Kalenty | 41 | Wife | — | Illinois |
| 37 | Robert Kalenty | 19 | Son | Shipping Clerk | Illinois |
| 38 | Betty Kalenty | 15 | Daughter | — | Illinois |
| 39 | Emma Kiefer | 55 | Head | — | Germany |
| 40 | Adolph Kiefer | 21 | Son | Ass'T Golf Prof. | Illinois |
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)