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Robert Jacobs — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lake-County, Illinois
Our Model Tree links this Robert Jacobs across the 1930 and 1940 US Censuses in Lake-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 8-person household.
Age 19
b. ~1921
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Illinois |
| Surname | Jacobs |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Lake Bluff Village |
| 1935 Residence (County) | Lake |
| Additional Details | |
| Occupation | Clerk |
| Industry | Retail Food Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 50 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Clerk |
| Township / Ward | Lake Bluff Village |
| Est. Birth Year | ~1921 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Bruce Jacobs | Son | — | 15 | ~1925 |
| Mary Jacobs | Daughter | — | 13 | ~1927 |
| Richard Jacobs | Son | — | 10 | ~1930 |
| Charles Jacobs | Head | — | 55 | ~1885 |
| Nancy Jacobs | Daughter | — | 6 | ~1934 |
| Charles Jacobs | Son | — | 17 | ~1923 |
| Rachel Jacobs | Spouse | — | 45 | ~1895 |
| Robert Jacobs | Son | — | 19 | ~1921 |
Census Appearances
1930
Lake, Illinois
Son, age 9
Lake, Illinois · implied b. ~1921 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Michigan |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Lake-County, Illinois
Son, age 19
Lake-County, Illinois · implied b. ~1921 — 8 household members
| Surname | Jacobs |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Lake Bluff Village |
| 1935 Residence (County) | Lake |
| Occupation | Clerk |
| Industry | Retail Food Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 50 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| 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 Robert Jacobs across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Jacobs
Son · 1940 · age 19 · b. ~1921 · Illinois
★ You are viewing this record
Sibling
Nancy Jacobs
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Jacobs
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bruce Jacobs
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Jacobs
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Jacobs
Sibling · 1940 · age 10
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 — Lake-County, Illinois
Open full size
1940 US Federal Census — Lake-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00830-00162)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Betty Jane Kettner | 3 | Daughter | — | Illinois |
| 42 | Joe Kettner | 28 | Brother | Furnace Operator | Wisconsin |
| 43 | Helen Beales | 26 | Lodger | Factory Worker | Wisconsin |
| 44 | David Perry Stiles | 42 | Head | Sales Manager | Illinois |
| 45 | Clara D. Stiles | 37 | Wife | — | Illinois |
| 46 | David Perry Jr. Stiles | 17 | Son | — | Minnesota |
| 47 | Lynn H. Stiles | 11 | Son | — | Minnesota |
| 48 | Clifford Stiles | 8 | Son | — | Illinois |
| 49 | Violet Smith | 24 | Servant | Maid | Minnesota |
| 50 | James Fuldner Stiles | 73 | Head | Salesman | New York |
| 51 | Isabelle Stiles | 76 | Wife | — | Washington D.C. |
| 52 | Charles W. Jacobs | 55 | Head | Financial Secretary | Illinois |
| 53 | Rachel N. Jacobs | 45 | Wife | — | Michigan |
| 54 | Robert Jacobs THIS PERSON | 19 | Son | Clerk | Illinois |
| 55 | Charles Jacobs | 17 | Son | Laborer | Illinois |
| 56 | Bruce Jacobs | 15 | Son | — | Illinois |
| 57 | Mary Kathryn Jacobs | 13 | Daughter | — | Illinois |
| 58 | Richard Jacobs | 10 | Son | — | Illinois |
| 59 | Nancy Rae Jacobs | 6 | Daughter | — | Illinois |
| 60 | Walter C. Bieger | 33 | Head | Manager | Illinois |
| 61 | Madora Bieger | 32 | Wife | — | Tennessee |
| 62 | Walter Jr. Bieger | 7 | Son | — | Illinois |
| 63 | Gwendolyn Bieger | 5 | Daughter | — | Illinois |
| 64 | Floyd L. Brown | 52 | Head | Teacher-Coach | Illinois |
| 65 | Marguerite Brown | 49 | Wife | — | Missouri |
| 66 | Clarence W. Glover | 45 | Head | Attorney | Illinois |
| 67 | Dorothy Glover | 42 | Wife | — | Pennsylvania |
| 68 | Janet Glover | 16 | Daughter | — | Illinois |
| 69 | Mara Ruth Glover | 13 | Daughter | — | Illinois |
| 70 | Sarah Crane | 71 | Mother-in-law | — | Vermont |
| 71 | Philip Allen | 32 | Head | Salesman | Illinois |
| 72 | Elizabeth Allen | 31 | Wife | — | Illinois |
| 73 | Elizabeth Allen | 2 | Daughter | — | Illinois |
| 74 | Harry Leo Jones | 39 | Head | Clerk | Iowa |
| 75 | Doris Jones | 37 | Wife | — | Iowa |
| 76 | Ruth Jones | 14 | Daughter | — | Illinois |
| 77 | Barbara Jones | 11 | Daughter | — | Illinois |
| 78 | Joann Jones | 9 | Daughter | — | Illinois |
| 79 | Norman Jones | 6 | Son | — | Illinois |
| 80 | Albert Leach | 33 | Head | Contractor | 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)