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Mary Mahoney — 1930 US Census Record
Linked across censuses1930 United States Federal Census · St Clair, Illinois
Our Model Tree links this Mary Mahoney across the 1920 and 1930 US Censuses in St Clair, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1913), then head of a 10-person household.
Age 17
b. ~1913
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | St Clair, Illinois |
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | E St Louis City Part Of |
| Est. Birth Year | ~1913 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Lois Mahoney | Daughter | — | 10 | ~1920 |
| Della Mahoney | Daughter | — | 27 | ~1903 |
| Mary Mahoney | Daughter | — | 17 | ~1913 |
| Thomas Mahoney | Head | — | 53 | ~1877 |
| Margaret Mahoney | Other | — | 4 | ~1926 |
| Thomas Mahoney | Son | — | 1 | ~1929 |
| Thomas Mahoney | Son | — | 22 | ~1908 |
| Edward Mahoney | Son | — | 15 | ~1915 |
| James Mahoney | Son | — | 24 | ~1906 |
| Sophie Mahoney | Spouse | — | 48 | ~1882 |
Census Appearances
1920
St Clair, …
Daughter, age 7
St Clair, Illinois · implied b. ~1913 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
St Clair, …
Daughter, age 17
St Clair, Illinois · implied b. ~1913 — 10 household members
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | Yes |
| 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 2 US Census years (1920 and 1930) in St Clair, Illinois, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mahoney
Daughter · 1930 · age 17 · b. ~1913 · Illinois
★ You are viewing this record
Sibling
James Mahoney
Sibling · 1930 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mahoney
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lois Mahoney
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Della Mahoney
Sibling · 1930 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mahoney
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mahoney
Sibling · 1930 · age 15
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 — St Clair, Illinois
Open full size
1930 US Federal Census — St Clair, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel556:0071)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William H Little | 9 | Son | None | Illinois |
| 2 | John E Little | 1 | Son | None | Illinois |
| 3 | Thomas Mahoney | 53 | Head | Laborer | Illinois |
| 4 | Sophie Mahoney | 48 | Wife | None | Illinois |
| 5 | James Mahoney | 24 | Son | Laborer | Illinois |
| 6 | Thomas Mahoney | 22 | Son | Operator | Illinois |
| 7 | Edward Mahoney | 15 | Son | None | Illinois |
| 8 | Mary Mahoney THIS PERSON | 17 | Daughter | None | Illinois |
| 9 | Lois Mahoney | 10 | Daughter | None | Illinois |
| 10 | Della Mahoney | 27 | Daughter | None | Missouri |
| 11 | Margaret Mahoney | 4 | G-daughter | None | Illinois |
| 12 | Thomas J Mahoney | 1 | Son | None | Illinois |
| 13 | Albert Johnson | 37 | Head | Stillman | Tennessee |
| 14 | Kate Johnson | 29 | Wife | None | Mississippi |
| 15 | Robert Johnson | 12 | Son | None | Illinois |
| 16 | Albert Johnson | 8 | Son | None | Illinois |
| 17 | Margaret Glover | 69 | Head | None | Mississippi |
| 18 | Joseph Stroop | 44 | Son | Banker | Mississippi |
| 19 | James Lacey | 40 | Head | Laborer | Texas |
| 20 | Fannie Lacey | 31 | Wife | None | Tennessee |
| 21 | Edward Woods | 51 | Head | Laborer | Kentucky |
| 22 | Mary E Woods | 60 | Wife | None | Alabama |
| 23 | Clara Jones | 52 | Head | Cook | Illinois |
| 24 | William Wright | 31 | Head | Laborer | Mississippi |
| 25 | Emma Wright | 31 | Wife | None | Louisiana |
| 26 | Lee Cooper | 49 | Head | Laborer | Mississippi |
| 27 | Ella Cooper | 43 | Wife | None | Mississippi |
| 28 | Mary L Cooper | 8 | Son | None | Arkansas |
| 29 | Henrietta Baker | 50 | Roomer | Picker | Georgia |
| 30 | Rose Taylor | 50 | Head | Housework | Tennessee |
| 31 | Fannie Brown | 35 | Daughter | None | Tennessee |
| 32 | Charles Wiles | 47 | Roomer | Barber | U.S. |
| 33 | Ingram Rose | 47 | Head | Painter | Missouri |
| 34 | Lethe Rose | 42 | Wife | None | Missouri |
| 35 | Lucien Rose | 19 | Son | Painter | Missouri |
| 36 | Dorothy Rose | 16 | Daughter | None | Missouri |
| 37 | Florence Rose | 3 | Daughter | None | Illinois |
| 38 | August Demme | 46 | Head | Driving | Illinois |
| 39 | Anne Demme | 49 | Wife | None | Illinois |
| 40 | Esther Maxwell | 17 | Daughter | None | Illinois |
| 41 | Catherine Demme | 12 | Daughter | None | Illinois |
| 42 | Genevieve Demme | 7 | Daughter | None | Illinois |
| 43 | Raymond Demme | 3 | Son | None | Illinois |
| 44 | John Strepel | 43 | Head | Truckster | Illinois |
| 45 | Lucy Strepel | 67 | Wife | None | Illinois |
| 46 | Herbert Demme | 39 | Son | Truckster | Illinois |
| 47 | Leonard Trout | 20 | Head | Timekeeper | Tennessee |
| 48 | Ruth Trout | 38 | Mother | None | Tennessee |
| 49 | Ruth Trout | 21 | Wife | None | Illinois |
| 50 | Ben Raymer | 40 | Roomer | Laborer | Illinois |
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)