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Mary Mcgrath — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Allegheny, Pennsylvania
Our Model Tree links this Mary Mcgrath across the 1910 and 1920 US Censuses in Allegheny, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1902), then head of a 13-person household.
Age 18
b. ~1902
Female
Daughter
Born: Pennsylvania
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Allegheny, Pennsylvania |
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Operator |
| Industry | Telephone |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Operator |
| Township / Ward | Pittsburgh City |
| Est. Birth Year | ~1902 |
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 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Nell Mcgrath | Daughter | — | 25 | ~1895 |
| Mary Mcgrath | Daughter | — | 18 | ~1902 |
| Katharine Mcgrath | Daughter | — | 16 | ~1904 |
| Ellinore Mcgrath | Daughter | — | 12 | ~1908 |
| Margaret Mcgrath | Daughter | — | 10 | ~1910 |
| Peter Mcgrath | Head | — | 60 | ~1860 |
| Johanna Powers | Other | — | 70 | ~1850 |
| Robert Mcgrath | Son | — | 8 | ~1912 |
| Anthony Mcgrath | Son | — | 14 | ~1906 |
| Peter Mcgrath | Son | — | 22 | ~1898 |
| Patrick Mcgrath | Son | — | 20 | ~1900 |
| John Mcgrath | Son | — | 24 | ~1896 |
| Bridget Mcgrath | Spouse | — | 49 | ~1871 |
Census Appearances
1910
Allegheny, Pennsylvania
Daughter, age 8
Allegheny, Pennsylvania · implied b. ~1902 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| 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 |
1920
Allegheny, Pennsylvania
Daughter, age 18
Allegheny, Pennsylvania · implied b. ~1902 — 13 household members
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Operator |
| Industry | Telephone |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | 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 (1910 and 1920) in Allegheny, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcgrath
Daughter · 1920 · age 18 · b. ~1902 · Pennsylvania
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Sibling
Peter Mcgrath
Sibling · 1920 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katharine Mcgrath
Sibling · 1920 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcgrath
Sibling · 1920 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ellinore Mcgrath
Sibling · 1920 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Mcgrath
Sibling · 1920 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anthony Mcgrath
Sibling · 1920 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nell Mcgrath
Sibling · 1920 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mcgrath
Sibling · 1920 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mcgrath
Sibling · 1920 · age 10
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
1920 US Federal Census — Allegheny, Pennsylvania
Open full size
1920 US Federal Census — Allegheny, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu1519unit:0704)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Augusta Lirvan | 27 | Daughter | Bookkeeper | Pennsylvania |
| 2 | Leah Lirvan | 24 | Daughter | Teacher | Pennsylvania |
| 3 | Peter Mcgrath | 60 | Head | Brick Paver | Ireland |
| 4 | Bridget Mcgrath | 49 | Wife | — | Ireland |
| 5 | Nell Mcgrath | 25 | Daughter | — | Pennsylvania |
| 6 | John Mcgrath | 24 | Son | — | Pennsylvania |
| 7 | Peter Mcgrath | 22 | Son | Bookkeeper | Pennsylvania |
| 8 | Patrick Mcgrath | 20 | Son | — | Pennsylvania |
| 9 | Mary Mcgrath THIS PERSON | 18 | Daughter | Operator | Pennsylvania |
| 10 | Katharine Mcgrath | 16 | Daughter | — | Pennsylvania |
| 11 | Anthony Mcgrath | 14 | Son | — | Pennsylvania |
| 12 | Ellinore Mcgrath | 12 | Daughter | — | Pennsylvania |
| 13 | Margaret Mcgrath | 10 | Daughter | — | Pennsylvania |
| 14 | Robert Mcgrath | 8 | Son | — | Pennsylvania |
| 15 | Johanna Powers | 70 | Lodger | — | Ireland |
| 16 | Frank E. Reford | 23 | Head | Organist | Pennsylvania |
| 17 | Amy Reford | 25 | Wife | — | Pennsylvania |
| 18 | Amy J. Jr. Reford | 1 | Daughter | — | Pennsylvania |
| 19 | Morris Radloff | 44 | Head | Grocer | Russia |
| 20 | Ada Radloff | 42 | Wife | — | Russia |
| 21 | Jennie Radloff | 20 | Daughter | Saleslady | Pennsylvania |
| 22 | Rose Radloff | 18 | Daughter | — | Pennsylvania |
| 23 | Gerald Smith | 5 | Grand-son | — | Pennsylvania |
| 24 | Joseph Harrison | 53 | Head | Engineer | England |
| 25 | Jane Harrison | 51 | Wife | — | England |
| 26 | Jane, Jr. Salisbury | 32 | Daughter | Dressmaker | Pennsylvania |
| 27 | Stanley Salisbury | 35 | Son-in-law | Machinist | Pennsylvania |
| 28 | Matilda Harrison | 30 | Daughter | Secretary | Pennsylvania |
| 29 | J. Ralph Harrison | 23 | Son | Salesman | Pennsylvania |
| 30 | Katharine Harrison | 22 | Daughter-in-law | — | Pennsylvania |
| 31 | Louisa Harrison | 18 | Daughter | — | Pennsylvania |
| 32 | Lee H. Harrison | 1 | Grand-son | — | Pennsylvania |
| 33 | Jane Harrison | 0 | Grand-daughter | — | Pennsylvania |
| 34 | Virginia Donnelly | 5 | Lodger | — | Pennsylvania |
| 35 | Martin J. Murphy | 38 | Head | Wireman | Pennsylvania |
| 36 | Mary E. Murphy | 38 | Wife | — | Pennsylvania |
| 37 | Rhoda Murphy | 12 | Daughter | — | Pennsylvania |
| 38 | James, Jr. Murphy | 9 | Son | — | Pennsylvania |
| 39 | Johanna Knox | 73 | Mother-in-law | — | Ireland |
| 40 | Elizabeth Stewart | 39 | Lodger | Yarn Dress | Pennsylvania |
| 41 | Alfred Kempner | 42 | Head | Repairman | Pennsylvania |
| 42 | Katharine Kempner | 39 | Wife | — | Pennsylvania |
| 43 | Alfred Kempner | 18 | Son | — | Pennsylvania |
| 44 | Jennie Kempner | 11 | Daughter | — | Pennsylvania |
| 45 | Mary J. Castell | 79 | Mother-in-law | — | Pennsylvania |
| 46 | Benjamin Arnold | 46 | Lodger | Bookkeeper | Washington, D.C. |
| 47 | Daniel T. Ferons | 42 | Head | Engineer | Pennsylvania |
| 48 | Mary Ferons | 41 | Wife | — | Ireland |
| 49 | Daniel Ferons | 14 | Son | — | Pennsylvania |
| 50 | Margaret Ferons | 13 | Daughter | — | Pennsylvania |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)