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Mary Mcgrath — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Allegheny, Pennsylvania
Our Model Tree links this Mary Mcgrath across the 1920 and 1930 US Censuses in Allegheny, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1910), then head of a 13-person household.
Age 20
b. ~1910
Female
Daughter
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Allegheny, Pennsylvania |
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Laundress |
| Industry | Laundry |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Laundress |
| Township / Ward | Pittsburgh City |
| 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.
13 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Anna Mcgrath | Daughter | — | 15 | ~1915 |
| Anna Mcgrath | Daughter | — | 18 | ~1912 |
| Margaret Mcgrath | Daughter | — | 17 | ~1913 |
| Mildred Mcgrath | Daughter | — | 9 | ~1921 |
| Elizabeth Mcgrath | Daughter | — | 4 | ~1926 |
| Mary Mcgrath | Daughter | — | 20 | ~1910 |
| Katherine Mcgrath | Daughter | — | 11 | ~1919 |
| Michael Mcgrath | Head | — | 53 | ~1877 |
| Leo Mcgrath | Son | — | 8 | ~1922 |
| John Mcgrath | Son | — | 21 | ~1909 |
| Thomas Mcgrath | Son | — | 12 | ~1918 |
| Joseph Mcgrath | Son | — | 6 | ~1924 |
| Mary Mcgrath | Spouse | — | 43 | ~1887 |
Census Appearances
1920
Allegheny, Pennsylvania
Daughter, age 9
Allegheny, Pennsylvania · implied b. ~1911 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Daughter, age 20
Allegheny, Pennsylvania · implied b. ~1910 — 13 household members
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laundress |
| Industry | Laundry |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 2 US Census years (1920 and 1930) in Allegheny, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcgrath
Daughter · 1930 · age 20 · b. ~1910 · Pennsylvania
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Sibling
Elizabeth Mcgrath
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katherine Mcgrath
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcgrath
Sibling · 1930 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mcgrath
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mcgrath
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mildred Mcgrath
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Mcgrath
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Mcgrath
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Mcgrath
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mcgrath
Sibling · 1930 · age 6
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
1930 US Federal Census — Allegheny, Pennsylvania
Open full size
1930 US Federal Census — Allegheny, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel1984:0990)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Nathan Morris | 30 | Head | Salesman | Georgia |
| 2 | Anna Morris | 28 | Wife | — | Georgia |
| 3 | Thomas Morris | 4 | Son | — | Ohio |
| 4 | Charles Evans | 40 | Head | Salesman | Georgia |
| 5 | Mary Evans | 43 | Wife | Cook | Mississippi |
| 6 | Robert Glass | 43 | Head | — | Kentucky |
| 7 | Lucy Glass | 40 | Wife | — | W. Virginia |
| 8 | Robert Glass | 6 | Son | — | Pennsylvania |
| 9 | Robert Stair | 34 | Head | Laborer | South Carolina |
| 10 | Theresa Stair | 34 | Wife | Porter | Virginia |
| 11 | Morris Jones | 65 | Head | — | Alabama |
| 12 | Lottie Jones | 52 | Wife | — | Pennsylvania |
| 13 | Elbert Jones | 21 | Son | Apprentice | Pennsylvania |
| 14 | Gennard Jones | 20 | Son | — | Pennsylvania |
| 15 | George Jones | 16 | Son | — | Pennsylvania |
| 16 | Margaret Jones | 11 | Daughter | — | Pennsylvania |
| 17 | Mary Jackson | 51 | Head | Laundress | Maryland |
| 18 | Helen Jackson | 29 | Daughter | — | Pennsylvania |
| 19 | Mary Jackson | 25 | Daughter | Laundress | Pennsylvania |
| 20 | William Jackson | 21 | Son | Laborer | Pennsylvania |
| 21 | Stella Jackson | 16 | Daughter | — | Pennsylvania |
| 22 | Elizabeth Jackson | 10 | Daughter | — | Pennsylvania |
| 23 | Michael Mcgrath | 53 | Head | Laborer | Ireland |
| 24 | Mary Mcgrath | 43 | Wife | — | Ireland |
| 25 | John Mcgrath | 21 | Son | Truck Driver | Pennsylvania |
| 26 | Mary Mcgrath THIS PERSON | 20 | Daughter | Laundress | Pennsylvania |
| 27 | Anna Mcgrath | 18 | Daughter | Laundress | Pennsylvania |
| 28 | Margaret Mcgrath | 17 | Daughter | Saleslady | Pennsylvania |
| 29 | Anna Mcgrath | 15 | Daughter | — | Pennsylvania |
| 30 | Thomas Mcgrath | 12 | Son | — | Pennsylvania |
| 31 | Katherine Mcgrath | 11 | Daughter | — | Pennsylvania |
| 32 | Mildred Mcgrath | 9 | Daughter | — | Pennsylvania |
| 33 | Leo Mcgrath | 8 | Son | — | Pennsylvania |
| 34 | Joseph Mcgrath | 6 | Son | — | Pennsylvania |
| 35 | Elizabeth Mcgrath | 4 | Daughter | — | Pennsylvania |
| 36 | Joseph J. Risley | 50 | Head | Bill Poster | Pennsylvania |
| 37 | Anna Risley | 48 | Wife | — | Pennsylvania |
| 38 | Joseph Mullaney | 66 | Head | Laborer | England |
| 39 | Mary Mullaney | 57 | Wife | — | Pennsylvania |
| 40 | Fred Kaupp | 40 | Boarder | Salesman | Pennsylvania |
| 41 | Margaret Kaupp | 38 | Daughter | Handsewer | Pennsylvania |
| 42 | Mary Mullaney | 28 | Daughter | Handsewer | Pennsylvania |
| 43 | Dorothy Mullaney | 17 | Daughter | Stock Girl | Pennsylvania |
| 44 | Maurice Van Horn | 60 | Head | — | Pennsylvania |
| 45 | Rosie Marr | 45 | Head | Laborer | Pennsylvania |
| 46 | Betty Marr | 6 | Daughter | — | Pennsylvania |
| 47 | Sara Marr | 24 | Son | Salesman | Pennsylvania |
| 48 | Albert Marr | 7 | Son | — | Pennsylvania |
| 49 | Alice Marr | 4 | Daughter | — | Pennsylvania |
| 50 | Rose Marr | 1 | Daughter | — | Pennsylvania |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)