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Margaret Mcgrath — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Margaret Mcgrath across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Philip & Wm — first a spouse (b.~1910), then head of a 5-person household.
Age 30
b. ~1910
Female
Spouse
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| 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 |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Lemont Village |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Margaret Mcgrath | Spouse | — | 30 | ~1910 |
| Robert Mcgrath | Son | — | 2 | ~1938 |
| Raymond Mcgrath | Son | — | 7 | ~1933 |
| Margie Mcgrath | Daughter | — | 4 | ~1936 |
| Raymond Mcgrath | Head | — | 33 | ~1907 |
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 |
Daughter, age 20
Cook, Illinois · implied b. ~1910 — 7 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 | 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 |
1940
Cook-County, Illinois
Spouse, age 30
Cook-County, Illinois · implied b. ~1910 — 5 household members
| 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 Margaret 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
Margaret Mcgrath
Spouse · 1940 · age 30 · b. ~1910 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-00780-00049)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 3 | Alfred White | 46 | Head | Steel Worker | Massachusetts |
| 4 | Elsie White | 43 | Wife | — | Illinois |
| 5 | Lois White | 16 | Daughter | — | Illinois |
| 6 | Augusta Bethke | 86 | Mother-in-law | — | Germany |
| 7 | Raymond Mcgrath | 33 | Head | Time Keeper | Illinois |
| 8 | Margaret Mcgrath THIS PERSON | 30 | Wife | — | Illinois |
| 9 | Raymond Mcgrath | 7 | Son | — | Illinois |
| 10 | Margie Mcgrath | 4 | Daughter | — | Illinois |
| 11 | Robert Mcgrath | 2 | Son | — | Illinois |
| 12 | Harry B. Wall | 40 | Head | Pipe Fitter | Illinois |
| 13 | Leona Wall | 37 | Wife | Bookkeeper | Illinois |
| 14 | Thor R. Tessin | 36 | Head | Salesman | Illinois |
| 15 | Frances Tessin | 27 | Wife | — | Canada |
| 16 | Thor Tessin | 4 | Son | — | Illinois |
| 17 | Charles Mcconnell | 32 | Head | Mail Carrier | Washington |
| 18 | Bessie Mcconnell | 27 | Wife | — | Washington |
| 19 | Barbara Mcconnell | 5 | Daughter | — | Illinois |
| 20 | Charles Mcconnell | 2 | Son | — | Illinois |
| 21 | Christen Johnson | 59 | Head | — | Sweden |
| 22 | William Kettering | 58 | Head | Manager | Illinois |
| 23 | Bertha Kettering | 51 | Wife | — | Wisconsin |
| 24 | Betty Kettering | 20 | Daughter | — | Illinois |
| 25 | William Kettering | 16 | Son | — | Illinois |
| 26 | George Hassel | 42 | Head | Accountant | Illinois |
| 27 | Ruth Hassel | 47 | Wife | — | Illinois |
| 28 | Glen W. Mcadam | 39 | Head | Proprietor | Illinois |
| 29 | Ruth Mcadam | 37 | Wife | — | Illinois |
| 30 | James Mcadam | 80 | Father | — | Scotland |
| 31 | Valentine Thvenske | 39 | Head | Chemist | Illinois |
| 32 | Hattie Thvenske | 35 | Wife | — | Illinois |
| 33 | Valentine Thvenske | 9 | Son | — | Illinois |
| 34 | Marylou Thvenske | 5 | Daughter | — | Illinois |
| 35 | Lola Thvenske | 4 | Daughter | — | Illinois |
| 36 | Julius Ahrens | 52 | Head | Repairman | Illinois |
| 37 | Augusta Ahrens | 56 | Wife | — | Germany |
| 38 | Edwin Ahrens | 28 | Son | Refiner | Illinois |
| 39 | Emile Ahrens | 25 | Daughter | Polisher | Illinois |
| 40 | Neil Ahrens | 21 | Son | Personnel Manager | Illinois |
Related Census Records
Pedigree Summary
Margaret
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 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)