MM
Mary Mcgrath — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Philadelphia, Pennsylvania
Our Model Tree links this Mary Mcgrath across the 1930 and 1940 US Censuses in Philadelphia, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 12-person household.
Age 1
b. ~1929
Female
Daughter
Born: Penna
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Philadelphia, Pennsylvania |
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Penna |
| Father's Birthplace | Penna |
| Mother's Birthplace | Penna |
| Additional Details | |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1929 |
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.
12 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcgrath | Daughter | — | 1 | ~1929 |
| Catherine Mcgrath | Daughter | — | 15 | ~1915 |
| Ann Mcgrath | Daughter | — | 12 | ~1918 |
| Ida Mcgrath | Daughter | — | 6 | ~1924 |
| James Mcgrath | Head | — | 56 | ~1874 |
| Bernard Egan | Other | — | 25 | ~1905 |
| Bernard Mcgrath | Son | — | 10 | ~1920 |
| John Mcgrath | Son | — | 19 | ~1911 |
| Edward Mcgrath | Son | — | 17 | ~1913 |
| James Mcgrath | Son | — | 14 | ~1916 |
| Joseph Mcgrath | Son | — | 8 | ~1922 |
| Ida Mcgrath | Spouse | — | 44 | ~1886 |
Census Appearances
1930
Philadelphia, Pennsylvania
Daughter, age 1
Philadelphia, Pennsylvania · implied b. ~1929 — 12 household members
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Penna |
| Father's Birthplace | Penna |
| Mother's Birthplace | Penna |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
1940
Philadelphia-County, Pennsylvania
Daughter, age 12
Philadelphia-County, Pennsylvania · implied b. ~1928 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Marg |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Penna |
| 1935 Residence (City) | Phila |
| 1935 Residence (County) | Phila |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
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 (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcgrath
Daughter · 1930 · age 1 · b. ~1929 · Pennsylvania
★ You are viewing this record
Sibling
Ann Mcgrath
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcgrath
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcgrath
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernard Mcgrath
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mcgrath
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ida Mcgrath
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Mcgrath
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcgrath
Sibling · 1930 · age 14
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 — Philadelphia, Pennsylvania
Open full size
1930 US Federal Census — Philadelphia, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2123:0197)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Tom Tiff | 22 | Roomer | Clerk | Penna |
| 2 | Virginia Tiff | 23 | Roomer | Clerk | Indiana |
| 3 | Johnnie Ingarigia | 70 | Roomer | — | Italy |
| 4 | Louis Sprow | 33 | Head | Machinist | Penna |
| 5 | Laura Sprow | 48 | Wife | — | Penna |
| 6 | Dodd J. Wilbur Sprow | 27 | Step son | — | Penna |
| 7 | White Ruth Sprow | 25 | Step daughter | — | Penna |
| 8 | Louis White | 32 | Head | Salesman | Russia |
| 9 | Frances White | 24 | Wife | — | Penna |
| 10 | Samuel White | 2 | Son | — | Penna |
| 11 | Arthur Mcmullen | 28 | Head | — | Penna |
| 12 | Helen Mcmullen | 26 | Wife | — | Penna |
| 13 | Lean Joseph Mcmullen | 29 | Boarder | Chauffeur | Penna |
| 14 | Cullen James Mcmullen | 15 | Boarder | — | Penna |
| 15 | William Carley | 56 | Head | Tracer | Penna |
| 16 | Sallie Carley | 52 | Wife | — | Penna |
| 17 | Margaret Carley | 74 | Mother | — | Penna |
| 18 | James Mccormick | 37 | Roomer | Policeman | Penna |
| 19 | Marguerite Mccormick | 32 | Daughter | — | Penna |
| 20 | William Mccormick | 2 | Grandson | — | Penna |
| 21 | Robert J. Smith | 40 | Head | Machinist | Penna |
| 22 | Beatrice Smith | 35 | Wife | — | Penna |
| 23 | Robert J. Jr. Smith | 19 | Son | Traffic Manager | Penna |
| 24 | Raymond G. Smith | 17 | Son | Operator | Penna |
| 25 | Frank G. Leonard | 45 | Head | Draftsman | Penna |
| 26 | Nellie Leonard | 41 | Wife | — | Penna |
| 27 | Eleanor Leonard | 18 | Daughter | Finisher | Penna |
| 28 | Dorothy Leonard | 16 | Daughter | — | Penna |
| 29 | Edward Leonard | 13 | Son | Pairer | Penna |
| 30 | Ronald Leonard | 11 | Son | Seamer | Penna |
| 31 | Patricia Leonard | 3 | Daughter | — | Penna |
| 32 | Harry Workman | 41 | Head | — | Penna |
| 33 | Anna Workman | 38 | Wife | — | District of Columbia |
| 34 | Harry Workman | 14 | Son | Stretcher | Penna |
| 35 | Norman Workman | 13 | Son | — | Penna |
| 36 | Virginia Workman | 10 | Daughter | — | Penna |
| 37 | Jacob Lincoln | 64 | Father in law | — | Penna |
| 38 | James J. Mcgrath | 56 | Head | — | Penna |
| 39 | Ida A. Mcgrath | 44 | Wife | Clerk | Penna |
| 40 | John Mcgrath | 19 | Son | — | Penna |
| 41 | Edward Mcgrath | 17 | Son | Clerk | Penna |
| 42 | Catherine Mcgrath | 15 | Daughter | Bookkeeper | Penna |
| 43 | James Mcgrath | 14 | Son | — | Penna |
| 44 | Ann Mcgrath | 12 | Daughter | — | Penna |
| 45 | Bernard Mcgrath | 10 | Son | — | Penna |
| 46 | Joseph Mcgrath | 8 | Son | — | Penna |
| 47 | Ida Mcgrath | 6 | Daughter | — | Penna |
| 48 | Mary Mcgrath THIS PERSON | 1 | Daughter | — | Penna |
| 49 | Bernard Egan | 25 | Cousin | Clerk | Irish Free State |
| 50 | Leonard Taff | 30 | Head | Manager | Massachusetts |
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)