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Mary Welsh — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Welsh across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1902), then head of a 4-person household.
Age 38
b. ~1902
Female
Daughter
Born: Scotland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Welsh |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 38 |
| Marital Status | Single |
| Birthplace | Scotland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Wrapper |
| Industry | Packing Plant |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Wrapper |
| Township / Ward | Chicago |
| Est. Birth Year | ~1902 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Bridget Welsh | Head | — | 68 | ~1872 |
| Helen Welsh | Daughter | — | 40 | ~1900 |
| Nathan Welsh | Son | — | 36 | ~1904 |
| Mary Welsh | Daughter | — | 38 | ~1902 |
Census Appearances
1930
Cook, Illinois
Daughter, age 27
Cook, Illinois · implied b. ~1903 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Welsh |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1921 |
| Father's Birthplace | Spain |
| Mother's Birthplace | Scotland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Cook-County, Illinois
Daughter, age 38
Cook-County, Illinois · implied b. ~1902 — 4 household members
| Surname | Welsh |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 38 |
| Marital Status | Single |
| Birthplace | Scotland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Wrapper |
| Industry | Packing Plant |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Welsh across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Welsh
Daughter · 1940 · age 38 · b. ~1902 · Illinois
★ You are viewing this record
Sibling
Nathan Welsh
Sibling · 1940 · age 36
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Welsh
Sibling · 1940 · age 40
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-t0627-00952-00056)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Catherine O'Donnell | 35 | Wife | — | Illinois |
| 2 | John O'Donnell | 16 | Son | — | Illinois |
| 3 | Agnes O'Donnell | 14 | Daughter | — | Illinois |
| 4 | Alice O'Donnell | 12 | Daughter | — | Illinois |
| 5 | Mary O'Donnell | 11 | Daughter | — | Illinois |
| 6 | Elizabeth O'Donnell | 8 | Daughter | — | Illinois |
| 7 | Margaret O'Donnell | 7 | Daughter | — | Illinois |
| 8 | Thomas O'Donnell | 5 | Son | — | Illinois |
| 9 | Patricia O'Donnell | 1 | Daughter | — | Illinois |
| 10 | Rudolph Chautka | 38 | Head | Truck Helper | Illinois |
| 11 | Anna D. Chautka | 33 | Wife | — | Illinois |
| 12 | Mary Chautka | 14 | Daughter | — | Illinois |
| 13 | Jean Chautka | 9 | Daughter | — | Illinois |
| 14 | Catherine Tolfis | 32 | Sister-in-law | Casing Peeler | Illinois |
| 15 | Dorothy Tolfis | 14 | Niece | — | Illinois |
| 16 | Joseph Wozniak | 50 | Head | Pipe Fitter | Poland |
| 17 | Josephine Wozniak | 49 | Wife | Proprietor | Poland |
| 18 | Helen Wozniak | 26 | Daughter | Secretary | Illinois |
| 19 | Joseph Somers | 39 | Head | Painter | Netherlands |
| 20 | Adeline Somers | 44 | Wife | — | Netherlands |
| 21 | John Somers | 12 | Son | — | Illinois |
| 22 | Henry Somers | 7 | Son | — | Illinois |
| 23 | John Scheffer | 75 | Father-in-law | — | Netherlands |
| 24 | William Walshuk | 37 | Head | Salesman | Ohio |
| 25 | Martha Walshuk | 36 | Wife | — | Illinois |
| 26 | Loraine Crawford | 19 | Daughter | File Clerk | Illinois |
| 27 | Arthur Walshuk | None | Carl | — | 4 |
| 28 | Richard Olson | 32 | Head | Pattern Maker | Illinois |
| 29 | Florence Olson | 39 | Wife | — | Illinois |
| 30 | Louis Olson | 9 | Daughter | — | Illinois |
| 31 | Joan Olson | 3 | Daughter | — | Illinois |
| 32 | Sarah La Comb | 62 | Head | — | Michigan |
| 33 | Joseph La Comb | 33 | Son | Passenger Agent | Illinois |
| 34 | Irene Canfield | 36 | Daughter | Stenographer | Michigan |
| 35 | William Pickett | 16 | Nephew | — | Illinois |
| 36 | Bridget Welsh | 68 | Head | — | Scotland |
| 37 | Helen Welsh | 40 | Daughter | Binder | Scotland |
| 38 | Mary Welsh THIS PERSON | 38 | Daughter | Wrapper | Scotland |
| 39 | Nathan Welsh | 36 | Son | Waiter | Scotland |
| 40 | James Flaherty | 28 | Head | Truck Driver | Illinois |
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)