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Mary Mcgrath — 1930 US Census Record
Model Tree available1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Mcgrath across the 1920, 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed), with identified parents Philip & Wm — first a daughter (b.~1910), then head of a 7-person household.
Age 20
b. ~1910
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | McGrath |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Multiplex Oper. |
| Industry | Postal Tel. + Cable |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Multiplex Oper. |
| Township / Ward | Chicago 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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcgrath | Daughter | — | 20 | ~1910 |
| Kathleen Mcgrath | Daughter | — | 18 | ~1912 |
| Philip Mcgrath | Head | — | 43 | ~1887 |
| Mary Mcgrath | Other | — | 42 | ~1888 |
| James Mcgrath | Son | — | 3 | ~1927 |
| Thomas Mcgrath | Son | — | 13 | ~1917 |
| Philip Mcgrath | Son | — | 15 | ~1915 |
Census Appearances
1920
Cook, Illinois
Daughter, age 9
Cook, Illinois · implied b. ~1911 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Mary B |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 20
Cook, Illinois · implied b. ~1910 — 7 household members
| Surname | McGrath |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Ireland |
| Occupation | Multiplex Oper. |
| Industry | Postal Tel. + Cable |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
Spouse, age 30
Cook-County, Illinois · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Lemont Village |
| 1935 Residence (County) | Cook |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Philip Mcgrath (~0.92 confidence) and father Wm Mcgrath (~0.92 confidence) and mother Anna Mcgrath (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Philip Mcgrath
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Wm Mcgrath
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Anna Mcgrath
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Mcgrath
Daughter · 1930 · age 20 · b. ~1910 · Illinois
★ You are viewing this record
Sibling
Kathleen Mcgrath
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Philip Mcgrath
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mcgrath
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcgrath
Sibling · 1930 · age 3
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 — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
49 people indexed on this census page (ia:1930:illinoiscensus00reel426:0393)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Roy O. Dietrich | 45 | Head | Orchestra Leader | Illinois |
| 2 | Jennie Dietrich | 38 | Wife-H | None | Russia |
| 3 | Roy H. Dietrich | 15 | Son | None | New York |
| 4 | Danny E. Dietrich | 11 | Son | None | New York |
| 5 | Francis Jaeger | 68 | Head | Crater | Indiana |
| 6 | Josephine T. Jaeger | 58 | Wife-H | None | Indiana |
| 7 | Theresa A. Peters | 49 | Head | None | Michigan |
| 8 | Theresa M. Peters | 16 | Daughter | None | Michigan |
| 9 | Agnes G. Peters | 8 | Daughter | None | Michigan |
| 10 | George R. Cantway | 31 | Head | Assistant Melter | Illinois |
| 11 | Margaret M. Cantway | 32 | Wife-H | None | Pennsylvania |
| 12 | George R. Cantway | 3 | Son | None | Illinois |
| 13 | Harold F. Currie | 33 | Head | Art + China Importer | Illinois |
| 14 | Ethel A. Currie | 31 | Wife-H | None | Illinois |
| 15 | Harold F. Currie | 8 | Son | None | Illinois |
| 17 | Thorfinn J. Sersha | 47 | Head | Dentist | Norway |
| 18 | Helga S. Sersha | 43 | Wife-H | None | Norway |
| 19 | Willard Sersha | 17 | Son | None | Illinois |
| 20 | Mark J. Sersha | 10 | Son | None | Illinois |
| 21 | Phillip P. Gates | 41 | Head | Accountant | Connecticut |
| 22 | Eleanor B. Gates | 41 | Wife-H | None | Connecticut |
| 23 | Phyllis B. Gates | 4 | Daughter | None | Illinois |
| 24 | John A. Blade | 76 | Father-in-law | None | Connecticut |
| 25 | Patrick J. O'Halloran | 41 | Head | Mfg. Supt. Drinks | Ireland |
| 26 | Margaret M. O'Halloran | 40 | Wife-H | None | Ireland |
| 27 | Mary E. O'Halloran | 18 | Daughter | None | Illinois |
| 28 | William P. O'Halloran | 16 | Son | None | Illinois |
| 29 | Margaret M. O'Halloran | 14 | Daughter | None | Illinois |
| 30 | Helen V. O'Halloran | 12 | Daughter | None | Illinois |
| 31 | Sigurd O. Beiring | 57 | Head | Painter | Sweden |
| 32 | Minnie Beiring | 58 | Wife-H | None | Sweden |
| 33 | Mabel M. Beiring | 29 | Daughter | Clerk Sales | Illinois |
| 34 | Chas. B. Green | 38 | Head | Ins. Broker | N. Carolina |
| 35 | Alice W. Green | 28 | Wife-H | None | Illinois |
| 36 | Ann G. Green | 4 | Daughter | None | Illinois |
| 37 | Roberta J. Green | 2 | Daughter | None | Illinois |
| 38 | Victor E. Dolan | 35 | Head | Solicitor | Illinois |
| 39 | Bessie S. Dolan | 35 | Wife-H | None | Illinois |
| 40 | Catherine J. Dolan | 15 | Daughter | None | Illinois |
| 41 | Victor G. Dolan | 13 | Son | None | Illinois |
| 42 | William W. Dolan | 9 | Son | None | Illinois |
| 43 | Robert A. Dolan | 2 | Son | None | Michigan |
| 44 | Philip J. Mcgrath | 43 | Head | Clerk Office | Illinois |
| 45 | Mary E. Mcgrath | 42 | Wife-H | None | Ireland |
| 46 | Mary E. Mcgrath THIS PERSON | 20 | Daughter | Multiplex Oper. | Illinois |
| 47 | Kathleen A. Mcgrath | 18 | Daughter | Counter Clerk | Illinois |
| 48 | Philip J. Mcgrath | 15 | Son | None | Illinois |
| 49 | Thomas J. Mcgrath | 13 | Son | None | Illinois |
| 50 | James G. Mcgrath | 3 | Son | None | Illinois |
Related Census Records
Pedigree Summary
Mary + 4 siblings
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)