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Robert Jacobs — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kane-County, Illinois
Our Model Tree links this Robert Jacobs across the 1930 and 1940 US Censuses in Kane-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Kane-County, Illinois |
| Surname | Jacobs |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Aurora City |
| 1935 Residence (County) | Kane |
| Additional Details | |
| Occupation | New Worker |
| Highest Grade | 8 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | New Worker |
| Township / Ward | Aurora City |
| Est. Birth Year | ~1925 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Bernard Jacobs | Son | — | 7 | ~1933 |
| Frank Jacobs | Head | — | 40 | ~1900 |
| Robert Jacobs | Son | — | 15 | ~1925 |
| Delores Jacobs | Daughter | — | 19 | ~1921 |
| Lena Jacobs | Spouse | — | 39 | ~1901 |
| Carole Jacobs | Daughter | — | 2 | ~1938 |
| Frank Jacobs | Son | — | 12 | ~1928 |
| William Jacobs | Son | — | 9 | ~1931 |
| Jean Jacobs | Daughter | — | 17 | ~1923 |
Census Appearances
1930
Kane, Illinois
Son, age 5
Kane, Illinois · implied b. ~1925 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Kane-County, Illinois
Son, age 15
Kane-County, Illinois · implied b. ~1925 — 9 household members
| Surname | Jacobs |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Aurora City |
| 1935 Residence (County) | Kane |
| Occupation | New Worker |
| Highest Grade | 8 |
| 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 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 15 · b. ~1925 · Illinois
★ You are viewing this record
Sibling
Frank Jacobs
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carole Jacobs
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Delores Jacobs
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernard Jacobs
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Jacobs
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Jacobs
Sibling · 1940 · age 17
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 — Kane-County, Illinois
Open full size
1940 US Federal Census — Kane-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00819-00992)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles E Peterson | 46 | Head | Shoe Shiner | Texas |
| 2 | Richard Peterson | 44 | Brother | Press Boy | Texas |
| 3 | Emma E Buckley | 76 | Head | — | Illinois |
| 4 | James E Melchert | 54 | Head | — | Illinois |
| 5 | Dorothy Melchert | 40 | Sister | Clerk | Illinois |
| 6 | Nicholas Meeker | 69 | Lodger | — | Germany |
| 7 | Nicholas Rausch | 63 | Lodger | — | Illinois |
| 8 | Joe Maas | 45 | Head | Painter | Illinois |
| 9 | Lynn Leonard | 40 | Head | Shoe Shiner | Tennessee |
| 10 | Beatrice Leonard | 40 | Wife | Maid | Illinois |
| 11 | Edna Leonard | 16 | Daughter | — | Illinois |
| 12 | Blanche Leonard | 15 | Daughter | — | Illinois |
| 13 | Edgar Tetterton | 51 | Lodger | Shoe Shiner | Tennessee |
| 14 | Allen Marion | 25 | Lodger | Sanitary | Illinois |
| 15 | Ana Joyner | 34 | Servant | Maid | Nebraska |
| 16 | Dorothy Chaney | 24 | Servant | Maid | Florida |
| 17 | Dorothy Miller | 26 | Servant | Maid | Illinois |
| 18 | Peter Lehmara | 69 | Head | — | Germany |
| 19 | Mat Derman | 69 | Head | — | Germany |
| 20 | Anton Hartmeyer | 74 | Head | Cigar Maker | Germany |
| 21 | Peter Running | 78 | Head | Porter | Germany |
| 22 | Joe Watford | 31 | Head | Laborer | Illinois |
| 23 | Velda Watford | 19 | Wife | Laborer | Illinois |
| 24 | Billie Joe Watford | 1 | Son | — | Illinois |
| 25 | James Smith | 24 | Head | Laborer | Illinois |
| 26 | Evelyn Smith | 17 | Wife | — | Illinois |
| 27 | Jeffrey M Smith | 0 | Son | — | Illinois |
| 28 | Abbott Parker | 26 | Head | Laborer | Kentucky |
| 29 | Amanda Parker | 27 | Wife | Maid | Illinois |
| 30 | Francis Bender | 28 | Head | Salesman | Ohio |
| 31 | James Shaffner | 30 | Partner | Salesman | Tennessee |
| 32 | Frank D Jacobs | 40 | Head | Laborer | Illinois |
| 33 | Lena D Jacobs | 39 | Wife | — | Illinois |
| 34 | Delores Jacobs | 19 | Daughter | — | Illinois |
| 35 | Jean Jacobs | 17 | Daughter | Maid | Illinois |
| 36 | Robert Jacobs THIS PERSON | 15 | Son | New Worker | Illinois |
| 37 | Frank Jacobs | 12 | Son | — | Illinois |
| 38 | William Jacobs | 9 | Son | — | Illinois |
| 39 | Bernard Jacobs | 7 | Son | — | Illinois |
| 40 | Carole Jacobs | 2 | Daughter | — | 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)