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Mary Bartlett — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Bartlett across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 7-person household.
Age 15
b. ~1925
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Bartlett |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | S 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1925 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Adele Bartlett | Daughter | — | 19 | ~1921 |
| Theresa Bartlett | Daughter | — | 13 | ~1927 |
| Mary Bartlett | Daughter | — | 15 | ~1925 |
| Walter Bartlett | Son | — | 23 | ~1917 |
| Eugene Bartlett | Son | — | 17 | ~1923 |
| Marie Bartlett | Head | — | 47 | ~1893 |
| Raymond Bartlett | Son | — | 21 | ~1919 |
Census Appearances
1930
Cook, Illinois
Daughter, age 5
Cook, Illinois · implied b. ~1925 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Bartlett |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | California |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 15
Cook-County, Illinois · implied b. ~1925 — 7 household members
| Surname | Bartlett |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Highest Grade | S 8 |
| 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 Bartlett across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Bartlett
Daughter · 1940 · age 15 · b. ~1925 · Illinois
★ You are viewing this record
Sibling
Eugene Bartlett
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Bartlett
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Adele Bartlett
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Bartlett
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Bartlett
Sibling · 1940 · age 13
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
39 people indexed on this census page (nara:1940:m-t0627-00935-00321)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Harold Portnoy | 16 | son | Usher | Illinois |
| 42 | Loraine Portnoy | 12 | daughter | — | Illinois |
| 43 | Emory Hansen | 39 | head | Brick Layer | Illinois |
| 44 | Helen Hansen | 37 | wife | — | Illinois |
| 45 | Jean Hansen | 16 | daughter | — | Illinois |
| 46 | Grace Hansen | 11 | daughter | — | Illinois |
| 47 | Joyce Hansen | 7 | daughter | — | Illinois |
| 48 | Ross Hansen | 5 | son | — | Illinois |
| 49 | William Zink | 59 | head | Hooker | Maryland |
| 50 | Lillian Zink | 50 | wife | — | Illinois |
| 51 | Roy Mcdonald | 25 | lodger | Helper | Canada Eng |
| 52 | Arthur Adams | 39 | head | Night Janitor | Illinois |
| 53 | Elizabeth Adams | 44 | wife | Housework | Pennsylvania |
| 54 | Arthur Adams | 18 | son | Usher | Illinois |
| 55 | James Bell | 44 | head | Electrician Machinist | Scotland |
| 56 | Jessie Bell | 42 | wife | — | Scotland |
| 57 | Jean Bell | 13 | daughter | — | Scotland |
| 58 | Anne Bell | 8 | daughter | — | Illinois |
| 59 | Jeanie Gibson | 74 | mother in law | — | Scotland |
| 60 | William J. Whelan | 32 | head | Electrical Work | Illinois |
| 61 | Jean Whelan | 33 | wife | Office Work | Illinois |
| 62 | William J. Whelan | 12 | son | — | Illinois |
| 63 | George P. Noyle | 37 | brother in law | Elevator Operator | Illinois |
| 64 | Evelyn Noyle | 35 | sister | Saleswoman | Illinois |
| 65 | Madeline Noyle | 12 | niece | — | Illinois |
| 66 | Donald Whelan | 26 | brother | Gunner | Illinois |
| 67 | Mary Jane Whelan | 59 | mother | — | Ireland |
| 68 | Marie Bartlett | 47 | head | — | Illinois |
| 69 | Walter Bartlett | 23 | son | Salesman | Illinois |
| 70 | Raymond Bartlett | 21 | son | Salesman | Illinois |
| 71 | Adele Bartlett | 19 | daughter | Saleslady | Illinois |
| 72 | Eugene Bartlett | 17 | son | — | Illinois |
| 73 | Mary Bartlett THIS PERSON | 15 | daughter | — | Illinois |
| 74 | Theresa Bartlett | 13 | daughter | — | Illinois |
| 75 | Grover Van Vliet | 55 | head | Locomotive Engineer | Michigan |
| 76 | Emilie Van Vliet | 48 | wife | — | Illinois |
| 77 | Ralph Van Vliet | 20 | son | Baggage Master | Illinois |
| 78 | Marjorie Van Vliet | 16 | daughter | Clerk | Illinois |
| 79 | Richard Van Vliet | 9 | 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)