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John Jacobs — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Jacobs across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1883), then head of a 4-person household.
Age 57
b. ~1883
Male
Head
Born: Lithuania
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Jacobs |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Lithuania |
| 1935 Residence (City) | Cicero |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Fireman |
| Industry | Cleaning & Dyeing Plant |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 468 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Lithuania |
| Birthplace (normalized) | lithuania |
| Occupation | Fireman |
| Township / Ward | Cicero |
| Est. Birth Year | ~1883 |
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 |
|---|---|---|---|---|
| John Jacobs | Head | — | 57 | ~1883 |
| Edward Jacobs | Son | — | 20 | ~1920 |
| Paul Jacobs | Son | — | 32 | ~1908 |
| Constantine Jacobs | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Cook, Illinois
Head, age 30
Cook, Illinois · implied b. ~1890 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Lithuania |
| Year of Immigration | 1911 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Lithuania |
| Mother's Birthplace | Lithuania |
| Occupation | Meat Cutter |
| Industry | Stock Yards |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Lithuanian |
| Home Owned/Rented | R |
| Birth Country | Lithuania |
| Birthplace (normalized) | lithuania |
1930
Cook, Illinois
Head, age 44
Cook, Illinois · implied b. ~1886 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Lithuania |
| Naturalization Status | Alien |
| Year of Immigration | 1908 |
| Age at First Marriage | 22 |
| Father's Birthplace | Lithuania |
| Mother's Birthplace | Lithuania |
| Occupation | Foreman |
| Industry | Shoe Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Lithuanian |
| Home Owned/Rented | R |
| Home Value / Rent | $30 |
| Birth Country | Lithuania |
| Birthplace (normalized) | lithuania |
1940
Cook-County, Illinois
Head, age 57
Cook-County, Illinois · implied b. ~1883 — 4 household members
| Surname | Jacobs |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Lithuania |
| 1935 Residence (City) | Cicero |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Fireman |
| Industry | Cleaning & Dyeing Plant |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 468 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Lithuania |
| Birthplace (normalized) | lithuania |
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 Jacobs across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Jacobs
Head · 1940 · age 57 · b. ~1883 · 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
38 people indexed on this census page (nara:1940:m-t0627-00775-01030)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edward Korkosz | 12 | Son | — | Illinois |
| 42 | John Korkosz | 10 | Son | — | Illinois |
| 43 | Vincent Boguszewski | 59 | Head | Proprietor | Poland |
| 44 | Helen Boguszewski | 48 | Wife | — | Poland |
| 45 | Stanley Boguszewski | 27 | Son | Janitor | Wisconsin |
| 46 | Alex Boguszewski | 24 | Son | Pressman | Wisconsin |
| 47 | Jeanette Boguszewski | 22 | Daughter | Receiver | Wisconsin |
| 48 | Philip Boguszewski | 24 | Son | Pressman | Wisconsin |
| 49 | John Kulnicky | 29 | Head | Machinist | Illinois |
| 50 | Eleanor Kulnicky | 25 | Wife | Assembler | Illinois |
| 51 | Joseph Contreras | 30 | Head | Maker | Iowa |
| 52 | Phyllis Contreras | 26 | Wife | — | Poland |
| 53 | Robert Contreras | 1 | Son | — | Illinois |
| 54 | Rosalie Ruskevicz | 52 | Head | Proprietor | Lithuania |
| 55 | Anna Ruskevicz | 28 | Daughter | Helper | Illinois |
| 56 | Dominica Ruskevicz | 26 | Son | Assembler | Illinois |
| 59 | William Kudskis | 32 | Head | Machinist | Illinois |
| 60 | Alice Kudskis | 25 | Wife | Assembler | Illinois |
| 61 | Joseph Miller | 60 | Head | Proprietor | Lithuania |
| 62 | Mary Miller | 57 | Wife | — | Lithuania |
| 63 | John Jacobs THIS PERSON | 57 | Head | Fireman | Lithuania |
| 64 | Constantine Jacobs | 57 | Wife | — | Lithuania |
| 65 | Paul Jacobs | 32 | Son | Machinist | Lithuania |
| 66 | Edward Jacobs | 20 | Son | Accountant | Michigan |
| 67 | Sante Stefani | 24 | Head | Janitor | Italy |
| 68 | Esther Stefani | 34 | Wife | — | Missouri |
| 69 | Charles Stefani | 2 | Son | — | Iowa |
| 70 | Louise Stefani | 1 | Daughter | — | Illinois |
| 71 | Frank Verrity | 32 | Head | Clerk | Ohio |
| 72 | Adelle Verrity | 27 | Wife | Proprietor | Illinois |
| 73 | Patrick Verrity | 8 | Son | — | Illinois |
| 74 | Phyllis Verrity | 6 | Daughter | — | Illinois |
| 75 | Adolph Swakowski | 59 | Head | Presser | Lithuania |
| 76 | Katherine Swakowski | 59 | Wife | — | Poland |
| 77 | John Volerge | 65 | Head | — | Lithuania |
| 78 | Johanna Volerge | 54 | Wife | — | Lithuania |
| 79 | Mary Volerge | 30 | Daughter | Assembler | Illinois |
| 80 | Genevieve Volerge | 28 | Daughter | Assembler | Illinois |
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)