MM
Mary Mcgrath — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hamilton-County, Ohio
Our Model Tree links this Mary Mcgrath across the 1920, 1930 and 1940 US Censuses in Hamilton-County, Ohio (XGBoost, ~Confirmed), with identified parents Jerry & Henry — first a daughter (b.~1897), then head of a 5-person household.
Age 43
b. ~1897
Female
Daughter
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hamilton-County, Ohio |
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Mount Healthy Village |
| 1935 Residence (County) | Hamilton |
| Additional Details | |
| Occupation | Operator |
| Industry | Telephone Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 682 |
| Highest Grade | H 8 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Operator |
| Township / Ward | Mount Healthy Village |
| Est. Birth Year | ~1897 |
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 |
|---|---|---|---|---|
| Mary Mcgrath | Daughter | — | 43 | ~1897 |
| Henry Mcgrath | Head | — | 76 | ~1864 |
| Michael Wall | Other | — | 66 | ~1874 |
| John Mcgrath | Son | — | 41 | ~1899 |
| Catherine Mcgrath | Spouse | — | 71 | ~1869 |
Census Appearances
1920
Hamilton, Ohio
Daughter, age 22
Hamilton, Ohio · implied b. ~1898 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Ohio |
| Occupation | Saleslady |
| Industry | Confectionery |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Hamilton, Ohio
Daughter, age 33
Hamilton, Ohio · implied b. ~1897 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Ohio |
| Occupation | operator |
| Industry | telephone |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Hamilton-County, Ohio
Daughter, age 43
Hamilton-County, Ohio · implied b. ~1897 — 5 household members
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Mount Healthy Village |
| 1935 Residence (County) | Hamilton |
| Occupation | Operator |
| Industry | Telephone Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 682 |
| Highest Grade | H 8 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
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 Mcgrath across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Jerry Mcgrath (~0.92 confidence) and father Henry Mcgrath (~0.92 confidence) and father Henry Mcgrath (~0.92 confidence) and mother Catherine Mcgrath (~0.92 confidence) and mother Mrs Mcgrath (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Jerry Mcgrath
b. ~1862
Source father
● Household
· direct · ~0.92
Father
Henry Mcgrath
b. ~1863
Source father
● Household
· direct · ~0.92
Father
Henry Mcgrath
b. ~1864
Source father
● Household
· direct · ~0.92
Mother
Catherine Mcgrath
b. ~1869
Source mother
● Household
· direct · ~0.92
Mother
Mrs Mcgrath
b. ~1869
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Mcgrath
Daughter · 1940 · age 43 · b. ~1897 · Ohio
★ You are viewing this record
Sibling
John Mcgrath
Sibling · 1940 · age 41
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 — Hamilton-County, Ohio
Open full size
1940 US Federal Census — Hamilton-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03079-00675)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Howard Lawrence | 28 | Head | Truck Driver | Ohio |
| 2 | Catherine Lawrence | 27 | Wife | — | Ohio |
| 3 | Joseph Lawrence | 3 | Son | — | Ohio |
| 4 | Joseph Coers | 63 | Father-in-law | — | Ohio |
| 5 | Robert Sloan | 41 | Head | Bus Driver | Kentucky |
| 6 | Ruth Sloan | 30 | Wife | — | Ohio |
| 7 | Robert Sloan | 10 | Son | — | Ohio |
| 8 | Martha Strong | 2 | Lodger | — | Ohio |
| 9 | William Gertz | 49 | Head | Machinist | Ohio |
| 10 | Catherine Gertz | 46 | Wife | — | Ohio |
| 11 | Jean Gertz | 15 | Daughter | — | Ohio |
| 12 | Mary Naegel | 75 | Mother-in-law | — | Ohio |
| 13 | Frank J. Loder | 35 | Head | Painter | Ohio |
| 14 | Margaret Loder | 33 | Wife | — | Ohio |
| 15 | Jane Loder | 11 | Daughter | — | Ohio |
| 16 | Joy Loder | 8 | Daughter | — | Ohio |
| 17 | Henry Schauger | 65 | Head | — | Ohio |
| 18 | Clara Schauger | 69 | Wife | — | Ill |
| 19 | George Herbe | 44 | Head | Gardener | Ohio |
| 20 | Rose Herbe | 50 | Wife | — | Ohio |
| 21 | Harry Broermann | 30 | Step-son | Fireman | Ohio |
| 22 | Edward Broermann | 28 | Step-son | Laborer | Ohio |
| 23 | Marie Broermann | 22 | Step-daughter | House Work | Ohio |
| 24 | Lawrence Kotzbauer | 23 | Lodger | Counter Man | Ohio |
| 25 | Albert Sloan | 37 | Head | Bus Driver | Kentucky |
| 26 | Mabel Sloan | 37 | Wife | — | Ohio |
| 27 | Henry Mcgrath | 76 | Head | — | North Dakota |
| 28 | Catherine Mcgrath | 71 | Wife | — | Ohio |
| 29 | Mary Mcgrath THIS PERSON | 43 | Daughter | Operator | Ohio |
| 30 | John Mcgrath | 41 | Son | Laborer | Ohio |
| 31 | Michael Wall | 66 | Brother-in-law | — | Ohio |
| 32 | Elmer Heinze | 35 | Head | Salesman | Ohio |
| 33 | Ruth Heinze | 33 | Wife | — | Indiana |
| 34 | Holly Ruth Heinze | 4 | Daughter | — | Ohio |
| 35 | Noel Edward Heinze | 2 | Son | — | Ohio |
| 36 | Martha Case | 20 | House Keeper | House Work | Kentucky |
| 37 | Anthony Mayer | 44 | Head | Molder | Germany |
| 38 | Viit Mayer | 43 | Wife | — | Germany |
| 39 | Mary Mayer | 20 | Daughter | Nurses Aid | Ohio |
| 40 | Katherine Mayer | 18 | Daughter | — | Ohio |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 5 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)