MM
Mary Mahoney — 1930 US Census Record
Model Tree available1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Mahoney across the 1910, 1920, 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed), with identified parents Thomas & John — first a daughter (b.~1903), then head of a 6-person household.
Age 27
b. ~1903
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1903 |
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.
6 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Sally Mahoney | Daughter | — | 25 | ~1905 |
| Margaret Mahoney | Daughter | — | 46 | ~1884 |
| Katherine Mahoney | Daughter | — | 23 | ~1907 |
| Mary Mahoney | Daughter | — | 27 | ~1903 |
| John Mahoney | Head | — | 70 | ~1860 |
| Cornelius Mahoney | Son | — | 30 | ~1900 |
Census Appearances
1910
Cook, Illinois
Daughter, age 7
Cook, Illinois · implied b. ~1903 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahony |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1920
Cook, Illinois
Daughter, age 16
Cook, Illinois · implied b. ~1904 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Messenger |
| Industry | Mail order house |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 27
Cook, Illinois · implied b. ~1903 — 6 household members
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Spouse, age 37
Cook-County, Illinois · implied b. ~1903 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahony |
| Given Name | Mabel |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Hours Worked | 0 |
| 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 Mahoney across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Thomas Mahony (~0.92 confidence) and father John Mahoney (~0.92 confidence) and mother Hannah Mahony (~0.92 confidence) and mother Elizabeth Mahoney (~0.92 confidence) and father Patrick Mahoney (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Mahony
b. ~1854
Source father
● Household
· direct · ~0.92
Father
John Mahoney
b. ~1860
Source father
● Household
· direct · ~0.92
Mother
Hannah Mahony
b. ~1864
Source mother
● Household
· direct · ~0.92
Mother
Elizabeth Mahoney
b. ~1871
Source mother
● Household
· direct · ~0.92
Father
Patrick Mahoney
b. ~1873
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Mahoney
Daughter · 1930 · age 27 · b. ~1903 · Illinois
★ You are viewing this record
Sibling
Katherine Mahoney
Sibling · 1930 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mahoney
Sibling · 1930 · age 46
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cornelius Mahoney
Sibling · 1930 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sally Mahoney
Sibling · 1930 · age 25
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
50 people indexed on this census page (ia:1930:illinoiscensus00reel437:0502)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John F Mulherin | 51 | Head | Steamfitter | Illinois |
| 2 | Nellie Mulherin | 47 | Wife-H | None | Illinois |
| 3 | Mae Mulherin | 25 | Daughter | Radio Repair | Illinois |
| 4 | John Jr Mulherin | 23 | Son | Apparatus | Illinois |
| 5 | Charles Mulherin | 21 | Son | Clerk | Illinois |
| 6 | Helen Mulherin | 17 | Daughter | Stenographer | Illinois |
| 7 | Raymond Mulherin | 13 | Son | None | Illinois |
| 8 | John Mahoney | 70 | Head | None | Ireland |
| 9 | Margaret Mahoney | 46 | Daughter | Stenographer | Illinois |
| 10 | Cornelius Mahoney | 30 | Son | Mechanic | Illinois |
| 11 | Mary Mahoney THIS PERSON | 27 | Daughter | None | Illinois |
| 12 | Sally Mahoney | 25 | Daughter | Stenographer | Illinois |
| 13 | Katherine Mahoney | 23 | Daughter | Stenographer | Illinois |
| 14 | John Hayes | 40 | Head | Pipe Fitter | Illinois |
| 15 | Hanna Hayes | 35 | Wife-H | None | Illinois |
| 16 | Margaret Hayes | 7 | Daughter | None | Illinois |
| 17 | James John Hayes | 4 | Son | None | Illinois |
| 18 | John Joseph Hayes | 4 | Son | None | Illinois |
| 19 | William Hayes | 2 | Son | None | Illinois |
| 20 | Thomas Caron | 45 | Head | Engineer | Illinois |
| 21 | Anna Caron | 40 | Wife-H | None | Illinois |
| 22 | Helen Caron | 16 | Daughter | None | Illinois |
| 23 | Marie Caron | 6 | Daughter | None | Illinois |
| 24 | Patrick Carey | 40 | Head | Superintendent | Illinois |
| 25 | Mae Carey | 40 | Wife-H | None | Illinois |
| 26 | Edward Carey | 13 | Son | None | Illinois |
| 27 | Jack Carey | 11 | Son | None | Illinois |
| 28 | Mercedes Carey | 9 | Daughter | None | Illinois |
| 29 | Catherine Carey | 7 | Daughter | None | Illinois |
| 30 | Frank Maslowski | 68 | Head | None | Poland |
| 31 | Julia Maslowski | 60 | Wife-H | None | Poland |
| 32 | Stanley Maslowski | 27 | Son | Shipping Clerk | Illinois |
| 33 | Alphonse Maslowski | 25 | Son | Checker | Illinois |
| 34 | Florence Maslowski | 24 | Son | Checker | Illinois |
| 35 | Helen Maslowski | 19 | Daughter | None | Illinois |
| 36 | Fleming Maslowski | 16 | Son | None | Illinois |
| 37 | Frank Marek | 48 | Head | Conductor | Poland |
| 38 | Julia Marek | 45 | Wife-H | None | Poland |
| 39 | Walter Marek | 22 | Son | Clerk | Illinois |
| 40 | Joseph Marek | 20 | Son | Service Man | Illinois |
| 41 | Edward Marek | 15 | Son | None | Illinois |
| 42 | Frank Marek | 12 | Son | None | Illinois |
| 43 | Stanley Marek | 10 | Son | None | Illinois |
| 44 | Bruno Marek | 7 | Son | None | Illinois |
| 45 | Harry Schaffer | 37 | Head | Chauffeur | Illinois |
| 46 | Alice Schaffer | 32 | Wife-H | None | Missouri |
| 47 | Mary Schaffer | 8 | Daughter | None | Illinois |
| 48 | Harry Jr Schaffer | 5 | Son | None | Illinois |
| 49 | Casimir Maslowski | 26 | Head | None | Poland |
| 50 | Chester Maslowski | 24 | Son | Chauffeur | Illinois |
Pedigree Summary
Mary + 4 siblings
Gen 1 · 5 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)