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Mary Mcnamara — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Mcnamara across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 11-person household.
Age 12
b. ~1928
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McNamara |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | H-1 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1928 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcnamara | Daughter | — | 12 | ~1928 |
| Rita Mcnamara | Daughter | — | 17 | ~1923 |
| Laverne Mcnamara | Daughter | — | 9 | ~1931 |
| Patricia Mcnamara | Daughter | — | 3 | ~1937 |
| Thomas Mcnamara | Head | — | 42 | ~1898 |
| Donald Mcnamara | Son | — | 8 | ~1932 |
| James Mcnamara | Son | — | 16 | ~1924 |
| Joseph Mcnamara | Son | — | 4 | ~1936 |
| Edward Mcnamara | Son | — | 14 | ~1926 |
| John Mcnamara | Son | — | 19 | ~1921 |
| Theresa Mcnamara | Spouse | — | 40 | ~1900 |
Census Appearances
1930
Cook, Illinois
Daughter, age 2
Cook, Illinois · implied b. ~1928 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McNamara |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Northern Ireland |
| Mother's Birthplace | Northern Ireland |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 12
Cook-County, Illinois · implied b. ~1928 — 11 household members
| Surname | McNamara |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | H-1 |
| 1935 Residence | Same Place |
| 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 Mcnamara across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcnamara
Daughter · 1940 · age 12 · b. ~1928 · Illinois
★ You are viewing this record
Sibling
Rita Mcnamara
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcnamara
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Mcnamara
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Mcnamara
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcnamara
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mcnamara
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcnamara
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Laverne Mcnamara
Sibling · 1940 · age 9
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
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00944-00810)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edna Power | 45 | Wife | — | Illinois |
| 2 | John Power | 27 | Son | Proprietor | Illinois |
| 3 | Joseph Power | 23 | Son | Lawyer | Illinois |
| 4 | Daniel Stua | 47 | Head | Proprietor Clerk | Illinois |
| 5 | Mary Stua | 50 | Wife | — | Illinois |
| 6 | Donald Stua | 20 | Son | Laborer | Illinois |
| 7 | Rosemary Stua | 14 | Daughter | — | Illinois |
| 8 | Elmer Harder | 26 | Head | Dock Hand | Illinois |
| 9 | Rose Harder | 27 | Wife | — | Illinois |
| 10 | Elmer Harder | 6 | Son | — | Illinois |
| 11 | Jacqueline Harder | 4 | Daughter | — | Illinois |
| 12 | Sol Sanders | 31 | Head | Proprietor Tailor | Poland |
| 13 | Mary Sanders | 31 | Wife | — | Poland |
| 14 | Walter Schroeder | 33 | Head | Soap Maker | Wisconsin |
| 15 | Dorothy Schroeder | 34 | Wife | — | Nebraska |
| 16 | Charles Kaher | 76 | Head | — | Austria |
| 17 | Thomas Mcnamara | 42 | Head | Lineman | Illinois |
| 18 | Theresa Mcnamara | 40 | Wife | — | Illinois |
| 19 | John Mcnamara | 19 | Son | Laborer | Illinois |
| 20 | Rita Mcnamara | 17 | Daughter | Nurse'S Aid | Illinois |
| 21 | James Mcnamara | 16 | Son | — | Illinois |
| 22 | Edward Mcnamara | 14 | Son | — | Illinois |
| 23 | Mary Mcnamara THIS PERSON | 12 | Daughter | — | Illinois |
| 24 | Laverne Mcnamara | 9 | Daughter | — | Illinois |
| 25 | Donald Mcnamara | 8 | Son | — | Illinois |
| 26 | Joseph Mcnamara | 4 | Son | — | Illinois |
| 27 | Patricia Mcnamara | 3 | Daughter | — | Illinois |
| 28 | George Dempsey | 37 | Head | Trainman | Illinois |
| 29 | Florence Dempsey | 37 | Wife | Bookkeeper | Illinois |
| 30 | Corinne Dempsey | 13 | Daughter | — | Illinois |
| 31 | George Dempsey | 6 | Son | — | Illinois |
| 32 | Clara Dillon | 52 | Lodger | Saleslady | Illinois |
| 33 | Michael Mcwhirter | 46 | Head | Patrolman | Ireland |
| 34 | Mary Mcwhirter | 44 | Wife | — | New York |
| 35 | Rita Mcwhirter | 19 | Daughter | File Clerk | Illinois |
| 36 | Dorothy Mcwhirter | 19 | Daughter | Jogger | Illinois |
| 37 | Bernard Mcwhirter | 17 | Son | — | Illinois |
| 38 | Mary Mcwhirter | 10 | Daughter | — | Illinois |
| 39 | Joseph Tumbruin | 43 | Head | Packer | Illinois |
| 40 | Elizabeth Tumbruin | 67 | Mother | — | Hungary |
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)