RJ
Robert Jacobs — 1940 US Census Record
Model Tree available1940 United States Federal Census · Warren-County, Iowa
Our Model Tree links this Robert Jacobs across the 1920, 1930 and 1940 US Censuses in Warren-County, Iowa (XGBoost, ~Confirmed), with identified parents Frank & Ella — first a head (b.~1910), then head of a 4-person household.
Age 30
b. ~1910
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Warren-County, Iowa |
| Surname | Jacobs |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Lacona Town |
| 1935 Residence (County) | Warren |
| Additional Details | |
| Occupation | Truck driver |
| Industry | Freight Line |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 1000 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Truck Driver |
| Township / Ward | Lacona Town |
| Est. Birth Year | ~1910 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Ronald Jacobs | Son | — | 4 | ~1936 |
| Juanita Jacobs | Spouse | — | 27 | ~1913 |
| Norma Jacobs | Daughter | — | 6 | ~1934 |
| Robert Jacobs | Head | — | 30 | ~1910 |
Census Appearances
1920
Warren, Iowa
Son, age 10
Warren, Iowa · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | Robert R |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Warren, Iowa
Son, age 20
Warren, Iowa · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | Robert R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Laborer |
| Industry | Odd jobs |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Warren-County, Iowa
Head, age 30
Warren-County, Iowa · implied b. ~1910 — 4 household members
| Surname | Jacobs |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Lacona Town |
| 1935 Residence (County) | Warren |
| Occupation | Truck driver |
| Industry | Freight Line |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 1000 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Jacobs (~0.92 confidence) and mother Ella Jacobs (~0.92 confidence) and mother Lillian Jacobs (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Jacobs
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Ella Jacobs
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Lillian Jacobs
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Jacobs
Head · 1940 · age 30 · b. ~1910 · Iowa
★ 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 — Warren-County, Iowa
Open full size
1940 US Federal Census — Warren-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01210-00534)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ada L. Stanley | 74 | Wife | — | Iowa |
| 42 | Jerome Conrad | 46 | Head | Farmer | Iowa |
| 43 | Ester Conrad | 42 | Wife | — | Iowa |
| 44 | Madonna Conrad | 12 | Daughter | — | Iowa |
| 45 | Walburg Halsburg | 86 | Mother | — | Germany |
| 46 | Joseph Shoemaker | 18 | Hired hand | Farm Worker | Iowa |
| 47 | Head Bruce | None | M | — | — |
| 48 | Blanche Bruce | 68 | Wife | — | Iowa |
| 49 | Fern Bruce | 36 | Daughter | Maid | Iowa |
| 50 | Earl Miller | 30 | Head | Road Work | Iowa |
| 51 | Viola Miller | 27 | Wife | — | Iowa |
| 52 | Carl R. Miller | 2 | Son | — | Iowa |
| 53 | Fred H. Kirkpatrick | 40 | Head | Truck Driver | Iowa |
| 54 | Phyllis V. Kirkpatrick | 25 | Wife | — | Iowa |
| 55 | William Kirkpatrick | 8 | Son | — | Iowa |
| 56 | James Kirkpatrick | 6 | Son | — | Iowa |
| 57 | Janis Kirkpatrick | 4 | Daughter | — | Iowa |
| 58 | Elmer Miller | 70 | Head | — | Iowa |
| 59 | Furman M. Myers | 70 | Head | — | Iowa |
| 60 | Molly L. Myers | 70 | Wife | — | Illinois |
| 61 | Robert Bauer | 29 | Head | Manager | Iowa |
| 62 | Carry Bauer | 32 | Wife | Teacher | Iowa |
| 63 | Robert Jacobs THIS PERSON | 30 | Head | Truck Driver | Iowa |
| 64 | Juanita Jacobs | 27 | Wife | — | Iowa |
| 65 | Norma J. Jacobs | 6 | Daughter | — | Iowa |
| 66 | Ronald L. Jacobs | 4 | Son | — | Iowa |
| 67 | P. C. Konrad | 59 | Head | Merchant | Iowa |
| 68 | Vernacia Konrad | 60 | Wife | — | Iowa |
| 69 | Mildred Konrad | 25 | Daughter | Clerk | Iowa |
| 70 | Norbert Konrad | 22 | Son | Clerk | Iowa |
| 71 | Sarah Mcfarland | 89 | Head | — | Illinois |
| 72 | Lulu Mcfarland | 58 | Daughter | — | Illinois |
| 73 | Marie Kuehter | 57 | Head | Maid | Iowa |
| 74 | Marie M. Keller | 49 | Head | — | Iowa |
| 75 | Marie Keller | 22 | Daughter | Teacher | Iowa |
| 76 | Guy Keller | 20 | Son | — | Iowa |
| 77 | Kenneth Keller | 18 | Son | Quarrying | Canada |
| 78 | Keith Keller | 16 | Son | — | Canada |
| 79 | Glen Baker | 47 | Head | Tank Man | Iowa |
| 80 | Florace Baker | 45 | Wife | — | Iowa |
Pedigree Summary
Robert
Gen 1 · 3 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)