JJ
James Jacobs — 1940 US Census Record
Model Tree available1940 United States Federal Census · Monroe-County, Indiana
Our Model Tree links this James Jacobs across the 1920, 1930 and 1940 US Censuses in Monroe-County, Indiana (XGBoost, ~Confirmed), with identified parents Albert & Joseph — first a head (b.~1916), then head of a 3-person household.
Age 24
b. ~1916
Male
Head
Born: Indiana
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Monroe-County, Indiana |
| Surname | Jacobs |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Perry |
| 1935 Residence (County) | Monroe |
| Additional Details | |
| Occupation | Signal man |
| Industry | Stone quarry |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 500 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Signal Man |
| Township / Ward | Perry |
| Est. Birth Year | ~1916 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| James Jacobs | Head | — | 24 | ~1916 |
| Ruby Jacobs | Spouse | — | 19 | ~1921 |
| Judith Jacobs | Daughter | — | ~1940 |
Census Appearances
1920
Monroe, Indiana
Son, age 4
Monroe, Indiana · implied b. ~1916 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | James E |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Monroe, Indiana
Son, age 14
Monroe, Indiana · implied b. ~1916 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Monroe-County, Indiana
Head, age 24
Monroe-County, Indiana · implied b. ~1916 — 3 household members
| Surname | Jacobs |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Perry |
| 1935 Residence (County) | Monroe |
| Occupation | Signal man |
| Industry | Stone quarry |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 500 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 James Jacobs across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Albert Jacobs (~0.92 confidence) and father Joseph Jacobs (~0.92 confidence) and mother Mattie Jacobs (~0.92 confidence) and mother Nettie Jacobs (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Albert Jacobs
b. ~1889
Source father
● Household
· direct · ~0.92
Father
Joseph Jacobs
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Mattie Jacobs
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Nettie Jacobs
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Jacobs
Head · 1940 · age 24 · b. ~1916 · Indiana
★ 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 — Monroe-County, Indiana
Open full size
1940 US Federal Census — Monroe-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01079-00820)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Cora Richardson | 8 | Daughter | — | Indiana |
| 2 | George Richardson | 5 | Son | — | Indiana |
| 3 | Retha Richardson | 3 | Daughter | — | Indiana |
| 4 | A. B. Humphrey | 60 | Head | Superintendent | Indiana |
| 5 | Marnie Humphrey | 58 | Wife | — | Indiana |
| 6 | Harold Humphrey | 23 | Son | W.P.A. Labor | Indiana |
| 7 | Gladine Humphrey | 22 | Wife | — | Indiana |
| 8 | Phyllis June Humphrey | 6 | Daughter | — | Indiana |
| 9 | Maxell Humphrey | 4 | Son | — | Indiana |
| 10 | Sandra Sue Humphrey | 1 | Daughter | — | Indiana |
| 11 | Bradley Wiles | 45 | Head | Machine Runner | Kentucky |
| 12 | Lizzie Wiles | 47 | Wife | — | Kentucky |
| 13 | Paul Wiles | 19 | Son | New Worker | Kentucky |
| 14 | Christina Wiles | 10 | Daughter | — | Indiana |
| 15 | James Jacobs THIS PERSON | 24 | Head | Signal Man | Indiana |
| 16 | Ruby Jacobs | 19 | Wife | — | Indiana |
| 17 | Judith Ann Jacobs | 0 | Daughter | — | Indiana |
| 18 | Jesse E. Rice | 28 | Head | W.P.A. Laborer | Indiana |
| 19 | Elverta Rice | 25 | Wife | — | Florida |
| 20 | Jerry Roscoe Rice | 6 | Son | — | Indiana |
| 21 | Melvin Rice | 2 | Son | — | Indiana |
| 22 | Roscoe Wilson | 60 | Head | W.P.A. Laborer | Indiana |
| 23 | Laura Wilson | 66 | Wife | — | Kentucky |
| 24 | Helen Marie Horton | 16 | Granddaughter | — | Ohio |
| 25 | Elijah Helton | 63 | Head | Car Blocker | Indiana |
| 26 | Edward Helton | 28 | Son | Furniture Factory | Indiana |
| 27 | Nellie Helton | 26 | Daughter-in-law | — | Indiana |
| 28 | David Lee Helton | 6 | Grandson | — | Indiana |
| 29 | Daniel J. Helton | 1 | Grandson | — | Indiana |
| 30 | Everett Smith | 51 | Head | Machine Runner | Indiana |
| 31 | Rosa Smith | 55 | Wife | — | Indiana |
| 32 | Claude Kinser | 45 | Head | Mill Foreman | Indiana |
| 33 | Mabel Kinser | 42 | Wife | — | Indiana |
| 34 | Vasil Kinser | 22 | Son | — | Indiana |
| 35 | Wayne Kinser | 6 | Son | — | Indiana |
| 36 | Anville Duncan | 22 | Son-in-law | W.P.A. Laborer | Indiana |
| 37 | Pauline Duncan | 17 | Daughter | — | Indiana |
| 38 | Danny Duncan | 0 | Grandson | — | Indiana |
| 39 | Earl Adams | 36 | Head | Planer Man | Indiana |
| 40 | Hazel Adams | 31 | Wife | — | Indiana |
Pedigree Summary
James
Gen 1 · 4 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)