MJ
Mary Jacobs — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Ohio
Our Model Tree links this Mary Jacobs across the 1920, 1930 and 1940 US Censuses in Montgomery-County, Ohio (XGBoost, ~Confirmed) — first a spouse (b.~1887), then head of a 5-person household.
Age 53
b. ~1887
Female
Spouse
Born: Hungary
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Ohio |
| Surname | Jacobs |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | Dayton |
| 1935 Residence (County) | Montgomery |
| Naturalization Status | Alien |
| Additional Details | |
| Class of Worker | No |
| Income (1939) | 0 |
| Highest Grade | 3 |
| 1935 Residence | Same place |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
| Township / Ward | Dayton |
| Est. Birth Year | ~1887 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Irene Jacobs | Daughter | — | 17 | ~1923 |
| Julia Jacobs | Daughter | — | 20 | ~1920 |
| Peter Jacobs | Head | — | 53 | ~1887 |
| Michael Jacobs | Son | — | 22 | ~1918 |
| Mary Jacobs | Spouse | — | 53 | ~1887 |
Census Appearances
1920
Montgomery, Ohio
Spouse, age 32
Montgomery, Ohio · implied b. ~1888 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacob |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Hungary |
| Year of Immigration | 1903 |
| Naturalization Status | Alien |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Hungarian |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
1930
Montgomery, Ohio
Other, age 43
Montgomery, Ohio · implied b. ~1887 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacob |
| Given Name | Mary |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Hungary |
| Naturalization Status | Alien |
| Year of Immigration | 1913 |
| Age at First Marriage | 26 |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | Magyar |
| Veteran | No |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
1940
Montgomery-County, Ohio
Spouse, age 53
Montgomery-County, Ohio · implied b. ~1887 — 5 household members
| Surname | Jacobs |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | Dayton |
| 1935 Residence (County) | Montgomery |
| Naturalization Status | Alien |
| Class of Worker | No |
| Income (1939) | 0 |
| Highest Grade | 3 |
| 1935 Residence | Same place |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
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 Mary Jacobs across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Jacobs
Spouse · 1940 · age 53 · b. ~1887 · Ohio
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Montgomery-County, Ohio
Open full size
1940 US Federal Census — Montgomery-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03253-00438)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James Thomas | 19 | Son | Truck Driver | Ohio |
| 42 | Florence Thomas | 17 | Daughter | — | Ohio |
| 43 | Lawrence Thomas | 17 | Son | New Worker | Ohio |
| 44 | Harry Thomas | 15 | Son | — | Ohio |
| 45 | William Thomas | 13 | Daughter | — | Ohio |
| 46 | Thomas Thomas | 12 | Son | — | Ohio |
| 47 | Doris Thomas | 10 | Daughter | — | Ohio |
| 48 | Dolores Thomas | 10 | Daughter | — | Ohio |
| 49 | Herbert Thomas | 8 | Son | — | Ohio |
| 50 | Franklyn Thomas | 6 | Son | — | Ohio |
| 51 | Wandalee Thomas | 4 | Daughter | — | Ohio |
| 52 | Jackie Thomas | 2 | Son | — | Ohio |
| 53 | Violent Thomas | 0 | Son | — | Ohio |
| 54 | Charles P. Teachman | 53 | Head | Laborer | Kentucky |
| 55 | Mary H. Teachman | 42 | Wife | — | Kentucky |
| 56 | Nancy E. Teachman | 11 | Daughter | — | Ohio |
| 57 | Charles E. Teachman | 9 | Son | — | Ohio |
| 58 | Edward Domsitz | 48 | Head | Foreman Foundry | Hungary |
| 59 | Lydia Domsitz | 44 | Wife | — | Hungary |
| 60 | Edith Domsitz | 14 | Daughter | — | Ohio |
| 61 | Edward Domsitz | 10 | Son | — | Ohio |
| 62 | Lydia Sachuri | 62 | Mother-in-law | — | Hungary |
| 63 | Hesa Domsitz | 65 | Head | — | Hungary |
| 64 | James Jakach | 32 | Head | Crane Operator | Connecticut |
| 65 | Margaret Jakach | 24 | Wife | — | Ohio |
| 66 | John Landerman | 55 | Head | Machinist | Ohio |
| 67 | Anna Landerman | 53 | Wife | — | Kentucky |
| 68 | Burt Landerman | 18 | Son | — | Ohio |
| 69 | Chester Allen | 32 | Head | Dishwasher | Kentucky |
| 70 | Ezra Allen | 25 | Wife | — | Tennessee |
| 71 | Chester Jr. Allen | 4 | Son | — | Ohio |
| 72 | Charles M. Allen | 3 | Son | — | Ohio |
| 73 | Phyllis Allen | 1 | Daughter | — | Ohio |
| 74 | Emanuel Scott | 59 | Head | Houseman | Kentucky |
| 75 | Mary Scott | 55 | Wife | Housework | Kentucky |
| 76 | Peter Jacobs | 53 | Head | Laborer | Hungary |
| 77 | Mary Jacobs THIS PERSON | 53 | Wife | — | Hungary |
| 78 | Michael Jacobs | 22 | Son | Assembler | Ohio |
| 79 | Julia Jacobs | 20 | Daughter | Belt Builder | Ohio |
| 80 | Irene Jacobs | 17 | Daughter | House Work | Ohio |
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)