MM
Mary Mccarthy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Mccarthy across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Christopher & Elizabeth — first a daughter (b.~1919), then head of a 3-person household.
Age 21
b. ~1919
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McCarthy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Typist |
| Industry | Newspaper |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1041 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Typist |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1919 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mccarthy | Daughter | — | 18 | ~1922 |
| Mary Mccarthy | Daughter | — | 21 | ~1919 |
| Mary Mccarthy | Head | — | 50 | ~1890 |
Census Appearances
1920
Cook, Illinois
Daughter, age 1
Cook, Illinois · implied b. ~1919 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Mother Tongue | English |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 11
Cook, Illinois · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 21
Cook-County, Illinois · implied b. ~1919 — 3 household members
| Surname | McCarthy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Typist |
| Industry | Newspaper |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1041 |
| Highest Grade | Hs 4 |
| 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 Mccarthy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Christopher Mccarthy (~0.92 confidence) and mother Elizabeth Mccarthy (~0.92 confidence) and mother Mary Mccarthy (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Christopher Mccarthy
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Mccarthy
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Mary Mccarthy
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Mccarthy
Daughter · 1940 · age 21 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
Mary Mccarthy
Sibling · 1940 · age 18
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
39 people indexed on this census page (nara:1940:m-t0627-00936-00150)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frederick C. Meyers | 64 | Head | Salesman | Illinois |
| 2 | Lydia Meyers | 64 | Wife | — | Illinois |
| 3 | Mary G. Mccarthy | 50 | Head | — | Illinois |
| 4 | Mary Mccarthy THIS PERSON | 21 | Daughter | Typist | Illinois |
| 5 | Mary Patricia Mccarthy | 18 | Daughter | — | Illinois |
| 6 | Palmer Wojtech | 53 | Head | Carpenter Contractor | Sweden |
| 7 | Ellen M. Wojtech | 52 | Wife | — | Sweden |
| 8 | Florence M. Wojtech | 30 | Daughter | Stenographer | Illinois |
| 9 | Ernest Olsen | 42 | Head | Physician | Illinois |
| 10 | Alice Olsen | 41 | Wife | — | Illinois |
| 11 | Hazel Olsen | 31 | Sister | Stenographer | Illinois |
| 12 | Mark C. Reardon | 41 | Head | Dentist | Wisconsin |
| 13 | Rosella Reardon | 39 | Wife | — | Tennessee |
| 14 | William Reardon | 8 | Son | — | Illinois |
| 15 | Mary Reardon | 6 | Daughter | — | Illinois |
| 16 | Henry Hackel | 41 | Head | Baker | Illinois |
| 17 | Emma Hackel | 40 | Wife | — | Illinois |
| 18 | Howard Hackel | 17 | Son | — | Illinois |
| 19 | Gretchen Hackel | 14 | Daughter | — | Illinois |
| 20 | Walter O'Barski | 68 | Head | — | Poland |
| 21 | Anna O'Barski | 62 | Wife | — | Poland |
| 22 | Clemens O'Barski | 35 | Son | Fireman | Illinois |
| 23 | Sylvester O'Barski | 29 | Son | Bank Teller | Illinois |
| 24 | Stephen O'Barski | 25 | Son | Paper Filler | Illinois |
| 25 | Victoria O'Barski | 23 | Daughter | Binder | Illinois |
| 26 | Harry O'Barski | 19 | Son | Drug Clerk | Illinois |
| 27 | Irene O'Barski | 15 | Daughter | — | Illinois |
| 28 | Edwin Kiehn | 35 | Head | Electrician | Illinois |
| 29 | Frieda Kiehn | 35 | Wife | — | Ohio |
| 30 | Ellen Kiehn | 11 | Daughter | — | Illinois |
| 31 | Carl Hedlund | 39 | Head | Machinist | Sweden |
| 32 | Betty Hedlund | 41 | Wife | — | Sweden |
| 33 | Sonia Hedlund | 11 | Daughter | — | Illinois |
| 34 | Hilding G. Oberg | 57 | Head | Painter | Sweden |
| 35 | J. Esther Oberg | 58 | Wife | — | Sweden |
| 36 | Hugo Johnson | 36 | Head | General Foreman | Illinois |
| 37 | Ruth Johnson | 33 | Wife | — | Indiana |
| 38 | Judith Johnson | 3 | Daughter | — | Illinois |
| 39 | Joseph S. Berghoff | 59 | Head | Salesman | Indiana |
Pedigree Summary
Mary + 1 sibling
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)