MK
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 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1917), then head of a 8-person household.
Age 23
b. ~1917
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | coil-winder |
| Industry | Radio-Shop |
| Class of Worker | PW |
| Hours Worked | 22 |
| Income (1939) | 496 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Coil-Winder |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1917 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Joseph Klein | Son | — | 16 | ~1924 |
| Millie Klein | Daughter | — | 20 | ~1920 |
| Johanna Klein | Spouse | — | 48 | ~1892 |
| Edward Klein | Son | — | 13 | ~1927 |
| George Klein | Head | — | 53 | ~1887 |
| Mary Klein | Daughter | — | 23 | ~1917 |
| George Klein | Son | — | 29 | ~1911 |
| John Klein | Son | — | 18 | ~1922 |
Census Appearances
1930
Cook, Illinois
Daughter, age 12
Cook, Illinois · implied b. ~1918 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Czechoslovakia |
| Mother's Birthplace | Czechoslovakia |
| Occupation | none |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 23
Cook-County, Illinois · implied b. ~1917 — 8 household members
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | coil-winder |
| Industry | Radio-Shop |
| Class of Worker | PW |
| Hours Worked | 22 |
| Income (1939) | 496 |
| Highest Grade | Hs 4 |
| 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 Klein across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Klein
Daughter · 1940 · age 23 · b. ~1917 · Illinois
★ You are viewing this record
Sibling
Edward Klein
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Klein
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Klein
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Klein
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Millie Klein
Sibling · 1940 · age 20
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-t0627-00977-00262)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Benny Morton | 27 | Head | Auto Mechanic | Mississippi |
| 42 | Sara Morton | 26 | Wife | — | Mississippi |
| 43 | Evelin Morton | 7 | Daughter | — | Illinois |
| 44 | Evelyn Morton | 4 | Daughter | — | Illinois |
| 45 | Dorothy Morton | 2 | Daughter | — | Illinois |
| 46 | Stobe Howard | 54 | Head | Janitor | Illinois |
| 47 | Isabell Howard | 53 | Wife | — | Illinois |
| 48 | Louis Mazota | 52 | Head | Watch Repairer | Italy |
| 49 | Josephine Mazota | 52 | Wife | — | Italy |
| 50 | John Mazota | 33 | Son | Window Cleaner | Illinois |
| 51 | Marie Mazota | 32 | Daughter-in-law | — | Illinois |
| 52 | Gerald Mazota | 2 | Grandson | — | Illinois |
| 53 | Louis Schutt | 71 | Head | Cloth Cutter | Illinois |
| 54 | Arthur Schutt | 28 | Son | Manager | Illinois |
| 55 | George Klein | 53 | Head | Unloader Freight Cars | Czechoslovakia |
| 56 | Johanna Klein | 48 | Wife | — | Czechoslovakia |
| 57 | George Klein | 29 | Son | Attendant | Illinois |
| 58 | Mary Klein THIS PERSON | 23 | Daughter | Coil-Winder | Illinois |
| 59 | Millie Klein | 20 | Daughter | Typist | Illinois |
| 60 | John R Klein | 18 | Son | Peddler-Govt Wrapper | Illinois |
| 61 | Joseph Klein | 16 | Son | — | Illinois |
| 62 | Edward Klein | 13 | Son | — | Illinois |
| 63 | Carrie Coates | 40 | Head | — | Louisiana |
| 64 | Charles Coates | 15 | Son | — | Illinois |
| 65 | Ernest Coates | 14 | Son | — | Illinois |
| 66 | Pearlee Coates | 11 | Daughter | — | Illinois |
| 67 | Marylee Coates | 8 | Daughter | — | Illinois |
| 68 | Joseph Coates | 6 | Son | — | Illinois |
| 69 | Martha Allen | 45 | Head | — | Texas |
| 70 | John Givens | 42 | Head | Laborer Streets | Illinois |
| 71 | Ora Givens | 36 | Wife | — | Missouri |
| 72 | Geneve Givens | 16 | Daughter | — | Illinois |
| 73 | Cora Givens | 3 | Daughter | — | Illinois |
| 74 | Jerry Thomas | 20 | Son-in-law | Grocery-Clerk | Arkansas |
| 75 | Dorothy Thomas | 17 | Daughter | — | Missouri |
| 76 | Fannie Dabney | 37 | Head | — | Georgia |
| 77 | Fannie Dabney | 8 | Daughter | — | Illinois |
| 78 | Dillard Dabney | 5 | Son | — | Illinois |
| 79 | Geneva Dabney | 3 | Daughter | — | Illinois |
| 80 | Sophia Baylis | 54 | Head | — | Mississippi |
Related Census Records
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)