MC
Mary Clarke — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Clarke across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1903), then head of a 6-person household.
Age 37
b. ~1903
Female
Spouse
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Clarke |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Chicago |
| 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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Thomas Clarke | Son | — | 11 | ~1929 |
| Paul Clarke | Son | — | 5 | ~1935 |
| Michael Clarke | Head | — | 50 | ~1890 |
| Sarah Clarke | Daughter | — | 15 | ~1925 |
| Michael Clarke | Son | — | 10 | ~1930 |
| Mary Clarke | Spouse | — | 37 | ~1903 |
Census Appearances
1930
Cook, Illinois
Other, age 26
Cook, Illinois · implied b. ~1904 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Margaret |
| Relationship to Head | Maid |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Ireland |
| Naturalization Status | Alien |
| Year of Immigration | 1919 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Maid |
| Industry | Private family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Veteran | No |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Cook-County, Illinois
Spouse, age 37
Cook-County, Illinois · implied b. ~1903 — 6 household members
| Surname | Clarke |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 Clarke across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Clarke
Spouse · 1940 · age 37 · b. ~1903 · Illinois
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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-t0627-00998-00771)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William Peterson | 45 | Head | — | Illinois |
| 42 | Henry Ginsbaum | Girsbaum | 56 | Head | Laborer | Illinois |
| 43 | Leonard Famillo | 29 | Head | Truck Driver | Illinois |
| 44 | Florence Famillo | 26 | Wife | — | Illinois |
| 45 | Michael Clarke | 50 | Head | Signal Man | Ireland |
| 46 | Mary Clarke THIS PERSON | 37 | Wife | — | Ireland |
| 47 | Sarah Clarke | 15 | Daughter | — | Illinois |
| 48 | Thomas Clarke | 11 | Son | — | Illinois |
| 49 | Michael Jr Clarke | 10 | Son | — | Illinois |
| 50 | Paul Clarke | 5 | Son | — | Illinois |
| 51 | Phillip Proll | 30 | Head | Carpenter | Illinois |
| 52 | Annie Proll | 29 | Wife | — | Illinois |
| 53 | Dona Proll | 7 | Daughter | — | Illinois |
| 54 | Phillip Proll | 3 | Son | — | Illinois |
| 55 | William Lange | 44 | Head | Service Man | Illinois |
| 56 | Mary Lange | 40 | Wife | Packer | Illinois |
| 57 | Frank Wojciech | 36 | Head | Cabinet Maker | Germany |
| 58 | Margaret Wojciech | 37 | Wife | — | Illinois |
| 59 | Barbara Wojciech | 3 | Daughter | — | Illinois |
| 60 | Marie Wojciech | 41 | Sister | — | Germany |
| 61 | John Bromstead | 45 | Head | Sub Station Operator | Illinois |
| 62 | Eleanor Bromstead | 42 | Wife | — | Illinois |
| 63 | Shirley Bromstead | 16 | Daughter | — | Illinois |
| 64 | John B. Ii Bromstead | 9 | Son | — | Illinois |
| 65 | Diane R. Bromstead | 3 | Daughter | — | Illinois |
| 66 | Otto Nelson | 44 | Head | Milkman | Sweden |
| 67 | Esther Nelson | 46 | Wife | — | Sweden |
| 68 | Leonard Nelson | 21 | Son | Wrapper | Illinois |
| 69 | Herbert Nelson | 19 | Son | Clerk | Illinois |
| 70 | Janet Nelson | 16 | Daughter | — | Illinois |
| 71 | Betty Jane Nelson | 15 | Daughter | — | Illinois |
| 72 | Richard Nelson | 5 | Son | — | Alabama |
| 73 | William Wall | 53 | Head | Pressman | New York |
| 74 | James Wall | 49 | Brother | — | Illinois |
| 75 | Reynold Koch | 40 | Head | Floor Walker | Illinois |
| 76 | Mina H. Koch | 43 | Wife | — | Germany |
| 77 | Otto Long | 24 | Step-son | Floor Walker | Illinois |
| 78 | Loretta Long | 21 | Daughter-in-law | Clerk | Illinois |
| 79 | Albert C. Herrmann | 43 | Head | Machinist | Illinois |
| 80 | Mildred E. Herrmann | 42 | Wife | — | 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)