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Mary Mcdermott — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Mcdermott across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 10-person household.
Age 1
b. ~1929
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Free State Ireland |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1929 |
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 |
|---|---|---|---|---|
| Anna Mcdermott | Daughter | — | 7 | ~1923 |
| Mary Mcdermott | Daughter | — | 1 | ~1929 |
| Eileen Mcdermott | Daughter | — | 5 | ~1925 |
| Margaret Mcdermott | Daughter | — | 12 | ~1918 |
| Kathleen Mcdermott | Daughter | — | 10 | ~1920 |
| Edward Mcdermott | Head | — | 47 | ~1883 |
| Catherine Mcdermott | Other | — | 39 | ~1891 |
| Patrick Mcdermott | Son | — | 3 | ~1927 |
| John Mcdermott | Son | — | 14 | ~1916 |
| Edward Mcdermott | Son | — | 16 | ~1914 |
Census Appearances
1930
Cook, Illinois
Daughter, age 1
Cook, Illinois · implied b. ~1929 — 10 household members
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Free State Ireland |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 12
Cook-County, Illinois · implied b. ~1928 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mac Dermott |
| 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 | No 5 |
| 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 Mcdermott across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcdermott
Daughter · 1930 · age 1 · b. ~1929 · Illinois
★ You are viewing this record
Sibling
Anna Mcdermott
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcdermott
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Mcdermott
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Mcdermott
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcdermott
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathleen Mcdermott
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mcdermott
Sibling · 1930 · age 12
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:illinoiscensus00reel435:0833)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Beatrix Lestik | 1 | Son | None | Illinois |
| 52 | Mary Stulgaits | 44 | Head | Meat Trimmer | Lithuania |
| 53 | Bernice Stulgaits | 21 | Daughter | Policy Writer | Massachusetts |
| 54 | Marie Stulgaits | 15 | Daughter | None | Illinois |
| 55 | Edward Mcdermott | 47 | Head | Clerical | Free State Ireland |
| 56 | Catherine Mcdermott | 39 | Wife-H | None | Illinois |
| 57 | Edward Mcdermott | 16 | Son | None | Illinois |
| 58 | John Mcdermott | 14 | Son | None | Illinois |
| 59 | Margaret Mcdermott | 12 | Daughter | None | Illinois |
| 60 | Kathleen Mcdermott | 10 | Daughter | None | Illinois |
| 61 | Anna Mcdermott | 7 | Daughter | None | Illinois |
| 62 | Eileen Mcdermott | 5 | Daughter | None | Illinois |
| 63 | Patrick Mcdermott | 3 | Son | None | Illinois |
| 64 | Mary Mcdermott THIS PERSON | 1 | Daughter | None | Illinois |
| 65 | Patrick Ward | 84 | Head | None | Free State Ireland |
| 66 | Matthew Donovan | 52 | Head | Engineer | Missouri |
| 67 | Frances Donovan | 42 | Wife-H | None | Illinois |
| 68 | Lucille Edwin Donovan | 6 | Boarder | None | Missouri |
| 69 | Alfred M Quacker | 25 | Boarder | Fireman | Canada English |
| 70 | Patrick Lee | 60 | Head | Check Clerk | Free State Ireland |
| 71 | Sarah Lee | 43 | Wife-H | None | Free State Ireland |
| 72 | Frances Lee | 14 | Son | None | Illinois |
| 73 | Michael Hanley | 59 | Head | Moulder | Free State Ireland |
| 74 | Nora Hanley | 47 | Wife-H | None | Free State Ireland |
| 75 | Marian Hanley | 22 | Daughter | Typist | Illinois |
| 76 | George Hanley | 20 | Son | Feeder | Illinois |
| 77 | Bernard Hanley | 18 | Son | None | Illinois |
| 78 | Thomas (Ab) Hanley | 20 | Son | None | Illinois |
| 79 | Felix Lesneski | 48 | Head | Machinist | Poland |
| 80 | Anna Lesneski | 48 | Wife-H | None | Illinois |
| 81 | Alice Lesneski | 22 | Daughter | Operator | Illinois |
| 82 | Frank Lesneski | 19 | Son | Garage | Illinois |
| 83 | Violet Lesneski | 15 | Daughter | None | Illinois |
| 84 | Joseph Mann | 55 | Head | Priest | Canada French |
| 85 | Arthur Dionne | 34 | Assistant | Priest | Illinois |
| 86 | Nellie Richard | 30 | Servant | Cook | Kansas |
| 87 | Servant Gagnon | 27 | Servant | Maid | Kansas |
| 88 | Alfred Matto | 47 | Head | Laborer | Kansas |
| 89 | Josephine Matto | 45 | Wife-H | None | Illinois |
| 90 | Arthur Matto | 13 | Son | None | Illinois |
| 91 | Ovide Matto | 8 | Son | None | Illinois |
| 92 | Lucille Gingras | 50 | Roomer | Saleslady | Illinois |
| 93 | Thomas Belton | 25 | Roomer | Airbrake Mechanic | Illinois |
| 94 | Alfred Suave | 61 | Roomer | Handy Man | Canada French |
| 95 | Ernest Suave | 20 | Roomer | Stockman | Illinois |
| 96 | William Andal | 41 | Roomer | Laborer | Germany |
| 97 | Thomas Mcdougall | 27 | Roomer | Timekeeper | Scotland |
| 98 | Fred Fullriede | 40 | Head | Peddler | Germany |
| 99 | Gertrude Fullriede | 34 | Wife-H | None | Illinois |
| 100 | Fred Fullriede | 12 | Son | None | 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)