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Joseph Jacobs — 1940 US Census Record
Model Tree available1940 United States Federal Census · Iowa-County, Iowa
Our Model Tree links this Joseph Jacobs across the 1920, 1930 and 1940 US Censuses in Iowa-County, Iowa (XGBoost, ~Confirmed), with identified parents Dennis & Mary — first a head (b.~1891), then head of a 5-person household.
Age 49
b. ~1891
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Iowa-County, Iowa |
| Surname | Jacobs |
| Given Name | Joseph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Marengo City |
| 1935 Residence (County) | Iowa |
| Additional Details | |
| Occupation | Carpenter |
| Industry | Garage |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 156 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Carpenter |
| Township / Ward | Marengo City |
| Est. Birth Year | ~1891 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Joseph | Age | Birth yr |
|---|---|---|---|---|
| Mary Jacobs | Spouse | — | 47 | ~1893 |
| Joseph Jacobs | Head | — | 49 | ~1891 |
| Robert Jacobs | Son | — | 17 | ~1923 |
| Loren Jacobs | Son | — | 15 | ~1925 |
| Emmett Jacobs | Son | — | 14 | ~1926 |
Census Appearances
1920
Iowa, Iowa
Son, age 27
Iowa, Iowa · implied b. ~1893 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | Joseph M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Laborer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Iowa, Iowa
Son, age 38
Iowa, Iowa · implied b. ~1892 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | Joseph M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Laborer |
| Industry | on Farm |
| Class of Worker | VVVV |
| Can Read/Write | Yes |
| Veteran | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Iowa-County, Iowa
Head, age 49
Iowa-County, Iowa · implied b. ~1891 — 5 household members
| Surname | Jacobs |
| Given Name | Joseph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Marengo City |
| 1935 Residence (County) | Iowa |
| Occupation | Carpenter |
| Industry | Garage |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 156 |
| 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 Joseph Jacobs across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Dennis Jacobs (~0.92 confidence) and mother Mary Jacobs (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Dennis Jacobs
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Mary Jacobs
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Joseph Jacobs
Head · 1940 · age 49 · b. ~1891 · 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 — Iowa-County, Iowa
Open full size
1940 US Federal Census — Iowa-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01168-00319)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Fredrick Carl | 19 | Lodger | Waiter | Iowa |
| 2 | Here Ends Block 15 & Begins Block 16 | None | — | — | — |
| 3 | C. H. Englebert | 32 | Head | Road Construction | Iowa |
| 4 | Gladys Englebert | 27 | Wife | — | Iowa |
| 5 | Andrea Englebert | 7 | Daughter | — | Iowa |
| 6 | Quentin Englebert | 5 | Son | — | Iowa |
| 7 | Karen Lee Englebert | 3 | Daughter | — | Iowa |
| 8 | H. C. Hoyt | 69 | Head | Road Maintenance | Iowa |
| 9 | Nettie G. Hoyt | 63 | Wife | — | Iowa |
| 10 | Lorena Hoyt | 37 | Daughter | Chief Switchboard Operator | Iowa |
| 11 | Joseph Jacobs THIS PERSON | 49 | Head | Carpenter | Iowa |
| 12 | Mary Jacobs | 47 | Wife | — | Iowa |
| 13 | Robert Jacobs | 17 | Son | Apprentice Mechanic | Iowa |
| 14 | Loren Jacobs | 15 | Son | New Worker | Illinois |
| 15 | Emmett Jacobs | 14 | Son | New Worker | Iowa |
| 16 | Ernest O. Williams | 47 | Head | Attendant | Iowa |
| 17 | Ara Williams | 54 | Wife | 80 | Iowa |
| 18 | Blaine Edwin Williams | 19 | Son | 18 | Iowa |
| 19 | Rosa Kuebler | 79 | Head | — | Germany |
| 20 | Here Ends Block 16 Gardens Addition & Begins Out Lot 2 Original Town. | None | — | — | — |
| 21 | Ida Connemaker | 33 | Head | Seamstress | Maryland |
| 22 | C. R. Jacobi | 33 | Head | Oil Station Attendant | Iowa |
| 23 | Rita Jacobi | 33 | Wife | — | Iowa |
| 24 | Carola Jean Jacobi | 5 | Daughter | — | Iowa |
| 25 | Janice Ann Jacobi | 2 | Daughter | — | Iowa |
| 26 | C. Oliva | 73 | Head | — | Germany |
| 27 | Nettie I. Oliva | 72 | Wife | — | Iowa |
| 28 | Lillie Lynch | 66 | Sister-in-law | — | Iowa |
| 29 | H. C. Kramer | 58 | Head | Watch Repairing | Iowa |
| 30 | Minnie Kramer | 58 | Wife | — | Iowa |
| 31 | Evelyn Kramer | 24 | Daughter | — | Iowa |
| 32 | Harry Kramer | 21 | Son | 14 | Iowa |
| 33 | Marion Kramer | 18 | Daughter | New Worker | Iowa |
| 34 | Here Ends Out Lot 2 & Begins Out Lot 3 | None | — | — | — |
| 35 | Grover Harty | 54 | Head | — | Iowa |
| 36 | Lillian Harty | 55 | Wife | — | Iowa |
| 37 | M. J. Harty | 62 | Head | Representative | Iowa |
| 38 | Extra Line | None | — | — | — |
| 39 | Here Ends Out Lot 3 & Begins Out Lot 4 | None | — | — | — |
| 40 | Earl Herman | 22 | Head | 18 | Iowa |
Pedigree Summary
Joseph
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)