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Mary Gallagher — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Gallagher across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 10-person household.
Age 10
b. ~1930
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Gallagher |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | CHICAGO CITY |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1930 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Peggy Gallagher | Daughter | — | 8 | ~1932 |
| Kathlene Gallagher | Daughter | — | 14 | ~1926 |
| Helen Gallagher | Daughter | — | 19 | ~1921 |
| Mary Gallagher | Daughter | — | 10 | ~1930 |
| John Gallagher | Head | — | 54 | ~1886 |
| Joan Gallagher | Son | — | 21 | ~1919 |
| Micheal Gallagher | Son | — | 12 | ~1928 |
| Manus Gallagher | Son | — | 22 | ~1918 |
| Connie Gallagher | Son | — | 17 | ~1923 |
| Helen Gallagher | Spouse | — | 45 | ~1895 |
Census Appearances
1930
Cook, Illinois
Daughter, age
Cook, Illinois · implied b. ~1930 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Gallagher |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Irish Free State |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 10
Cook-County, Illinois · implied b. ~1930 — 10 household members
| Surname | Gallagher |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | CHICAGO CITY |
| 1935 Residence (County) | Cook |
| Highest Grade | No 5 |
| 1935 Residence | Illinois |
| 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 Gallagher across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Gallagher
Daughter · 1940 · age 10 · b. ~1930 · Illinois
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Sibling
Micheal Gallagher
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Connie Gallagher
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Manus Gallagher
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Gallagher
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Peggy Gallagher
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathlene Gallagher
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Gallagher
Sibling · 1940 · age 19
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-t0627-00933-00780)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | M. Tamson | 60 | Head | Salesman | Greece |
| 2 | Frieda E. Hofreiter | 51 | Head | Housekeeper | Illinois |
| 3 | William F. Hofreiter | 24 | Son | Clerk | Illinois |
| 4 | Norman Huth | 41 | Lodger | — | Illinois |
| 5 | Wanda M. Jingling | 28 | Head | — | Illinois |
| 6 | Edward E. Jingling | 22 | Brother | Laborer | Illinois |
| 7 | Jess E. Wagner | 41 | Head | Valet | Texas |
| 8 | June L. Wagner | 45 | Wife | — | Illinois |
| 9 | Jess E. Jr. Wagner | 4 | Son | — | Illinois |
| 10 | Edward J. Talentus | 54 | Head | Janitor | Lithuania |
| 11 | Rose D. Talentus | 25 | Daughter | — | Illinois |
| 12 | Leonard Byron | 27 | Son-in-law | Clerk | Indiana |
| 13 | Helen Byron | 27 | Daughter | Bander | Illinois |
| 14 | Sally Towns | 69 | Head | — | Kentucky |
| 15 | Velma Hyslop | 28 | Daughter | Receptionist | Illinois |
| 16 | Dona Mae Hyslop | 8 | Grand Daughter | — | Illinois |
| 17 | James Markland | 44 | Head | Bricklayer | England |
| 18 | Mary C. Markland | 44 | Wife | — | England |
| 19 | James L. Markland | 18 | Son | Clerk | England |
| 20 | Gladys Markland | 17 | Daughter | — | England |
| 21 | Apostal Gouvalaris | 53 | Head | Shoe Repairing | Greece |
| 22 | Paul E. Whitlock | 33 | Head | Cab Driver | Colorado |
| 23 | Helen E. Whitlock | 32 | Wife | — | Illinois |
| 24 | Edward J. Whitlock | 8 | Son | — | Illinois |
| 25 | Robert E. Whitlock | 6 | Son | — | Illinois |
| 26 | Richard Whitlock | 2 | Son | — | Illinois |
| 27 | Edith Whitlock | 60 | Mother | — | Canada English |
| 28 | John A. Gallagher | 54 | Head | Building Laborer | Michigan |
| 29 | Helen E. Gallagher | 45 | Wife | — | Irish Free State |
| 30 | Manus J. Gallagher | 22 | Son | Jr. Recreation | Indiana |
| 31 | Joan P. Gallagher | 21 | Son | Laborer | Indiana |
| 32 | Helen E. Gallagher | 19 | Daughter | Jr. Recreation | Indiana |
| 33 | Connie P. Gallagher | 17 | Son | Laborer | Indiana |
| 34 | Kathlene A. Gallagher | 14 | Daughter | — | Indiana |
| 35 | Micheal J. Gallagher | 12 | Son | — | Illinois |
| 36 | Mary A. Gallagher THIS PERSON | 10 | Daughter | — | Illinois |
| 37 | Peggy Gallagher | 8 | Daughter | — | Illinois |
| 38 | John C. Heller | 30 | Head | Freight Handler | Illinois |
| 39 | Margaret L. Heller | 29 | Wife | — | Ohio |
| 40 | Charles L. Farquhar | 58 | Head | Janitor | Ohio |
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)