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Mary Klein — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Klein across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1881), then head of a 3-person household.
Age 59
b. ~1881
Female
Spouse
Born: Hungary
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1881 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Helen Klein | Daughter | — | 20 | ~1920 |
| Mary Klein | Spouse | — | 59 | ~1881 |
| Louis Klein | Head | — | 61 | ~1879 |
Census Appearances
1920
Cook, Illinois
Spouse, age 37
Cook, Illinois · implied b. ~1883 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Hungary |
| Year of Immigration | 1899 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Hungarian |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
1930
Cook, Illinois
Spouse, age 48
Cook, Illinois · implied b. ~1882 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Hungary |
| Naturalization Status | Alien |
| Year of Immigration | 1899 |
| Age at First Marriage | 20 |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Can Read/Write | Yes |
| Mother Tongue | Hungarian |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
1940
Cook-County, Illinois
Spouse, age 59
Cook-County, Illinois · implied b. ~1881 — 3 household members
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
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 Klein across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Klein
Spouse · 1940 · age 59 · b. ~1881 · Illinois
★ You are viewing this record
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
39 people indexed on this census page (nara:1940:m-t0627-00941-00443)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charlene Kuecker | 2 | Daughter | — | Illinois |
| 2 | Phillip J. Hammer | 47 | Head | Watchman | Illinois |
| 3 | Theresa E. Hammer | 46 | Wife | — | Illinois |
| 4 | Ann A. Berklow | 50 | Head | — | Austria |
| 5 | Helen C. Berklow | 25 | Daughter | Machine Operator | Canada |
| 6 | Ann Berklow | 23 | Daughter | — | Montana |
| 7 | Luke Berklow | 20 | Son | Ship Builder | Montana |
| 8 | Evelyn Berklow | 16 | Daughter | — | Illinois |
| 9 | Catherine Berklow | 14 | Daughter | — | Illinois |
| 10 | Lucy May Berklow | 11 | Daughter | — | Illinois |
| 11 | Steve Berklow | 8 | Son | — | Illinois |
| 12 | Joseph Zboril | 43 | Head | Motor Inspector | Illinois |
| 13 | Theresa Zboril | 31 | Wife | — | Illinois |
| 14 | Elinora Hachik | 14 | Daughter | — | Illinois |
| 15 | Louis Klein | 61 | Head | Flagman | Hungary |
| 16 | Mary Klein THIS PERSON | 59 | Wife | — | Hungary |
| 17 | Helen Klein | 20 | Daughter | — | Illinois |
| 18 | William H. Fleming | 57 | Head | Locomotive Engineer | Indiana |
| 19 | Hazel Fleming | 50 | Wife | — | Ohio |
| 20 | Maurice Brouillette | 47 | Head | Machinist | Illinois |
| 21 | Mary Brouillette | 48 | Wife | Proprietor | Michigan |
| 22 | Margaret Brouillette | 18 | Daughter | — | Illinois |
| 23 | Patrick Brouillette | 14 | Son | — | Illinois |
| 24 | Helen Brouillette | 11 | Daughter | — | Illinois |
| 25 | Richard Brouillette | 9 | Son | — | Illinois |
| 26 | Frances Brouillette | 6 | Daughter | — | Illinois |
| 27 | James Murphy | 78 | Boarder | — | Ireland |
| 28 | Elmer J. Mails | 44 | Head | Handy Man | Wisconsin |
| 29 | Clara Mails | 47 | Wife | — | Illinois |
| 30 | Walter Mails | 16 | Son | Delivery Boy | Illinois |
| 31 | Audrey Mails | 4 | Daughter | — | Illinois |
| 32 | Alfred J. Mails | 3 | Son | — | Illinois |
| 33 | William E. Addis | 35 | Head | Proprietor | Illinois |
| 34 | Francis Addis | 20 | Son | Clerk | Illinois |
| 35 | Charles Addis | 14 | Son | — | Illinois |
| 36 | Maximino Salazar | 56 | Head | — | Mexico |
| 37 | Marguerite Salazar | 44 | Wife | — | Mexico |
| 38 | Joseph Salazar | 16 | Son | — | Illinois |
| 39 | Vincent Salazar | 14 | Son | — | 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)