MS
Mary Sears — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Sears across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1914), then head of a 6-person household.
Age 26
b. ~1914
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Sears |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Cashier |
| Industry | Grocery Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 850 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Cashier |
| Township / Ward | Chicago |
| Est. Birth Year | ~1914 |
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 |
|---|---|---|---|---|
| John Farrell | Head | — | 49 | ~1891 |
| William Farrell | Son | — | 16 | ~1924 |
| Anna Farrell | Spouse | — | 51 | ~1889 |
| Mary Sears | Daughter | — | 26 | ~1914 |
| John Farrell | Son | — | 27 | ~1913 |
| Anna Farrell | Daughter | — | 17 | ~1923 |
Census Appearances
1930
Cook, Illinois
Daughter, age 15
Cook, Illinois · implied b. ~1915 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sare |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Yugoslavia |
| Mother's Birthplace | Yugoslavia |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 26
Cook-County, Illinois · implied b. ~1914 — 6 household members
| Surname | Sears |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Cashier |
| Industry | Grocery Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 850 |
| 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 Sears across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Sears
Daughter · 1940 · age 26 · b. ~1914 · Illinois
★ You are viewing this record
Sibling
Anna Farrell
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Farrell
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Farrell
Sibling · 1940 · age 16
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
37 people indexed on this census page (nara:1940:m-t0627-01010-00219)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Joseph Kaps | 11 | Son | — | Illinois |
| 42 | Charles Dare | 60 | Head | Janitor | Wisconsin |
| 43 | Mary Dare | 60 | Wife | — | Ireland |
| 44 | Virginia Dare | 20 | Daughter | New Worker | Illinois |
| 45 | Peter Sibom | 55 | Head | Watchman | Sweden |
| 46 | Lillian Sibom | 50 | Wife | — | England |
| 47 | Axel Oberg | 42 | Lodger | Loader | Sweden |
| 48 | Alfred Liddle | 61 | Lodger | Laborer | Scotland |
| 49 | Robert Layton | 32 | Head | Cook | California |
| 50 | Mildred Layton | 35 | Wife | Gen Office | Illinois |
| 51 | Arthur Sanders | 43 | Head | Truck Driver | Indiana |
| 52 | Anna Sanders | 27 | Wife | Maid | Illinois |
| 53 | Thomas Sanders | 1 | Son | — | Illinois |
| 54 | Mattie Sanders | 64 | Mother | — | Indiana |
| 55 | Wing Son Chinn | 15 | Head | Helper | China |
| 56 | Charles M. Scherer | 73 | Head | Optometrist | Illinois |
| 57 | Sevalia Ramsey | 48 | Head | Housekeeper | Virginia |
| 58 | Martha Ramsey | 13 | Grand daughter | — | Iowa |
| 59 | Nathan Saichek | 43 | Lodger | Pin Boy | Russia |
| 60 | Sam Kaufman | 52 | Lodger | Maintainer | New York |
| 61 | Jacob Backer | 52 | Lodger | Pin Boy | Illinois |
| 62 | Fred (At) Kruger | 31 | Head | Sheet Metal Worker | New York |
| 63 | Adelaide Kruger | 27 | Wife | — | Illinois |
| 64 | Fred Jr. Kruger | 8 | Son | — | Illinois |
| 65 | James Kruger | 4 | Son | — | Illinois |
| 66 | John Kruger | 2 | Son | — | Illinois |
| 67 | Herbert Spence | 40 | Head | Paper Cutter | Canada |
| 68 | Gertrude Spence | 37 | Wife | — | England |
| 69 | Gerald Spence | 8 | Son | — | Illinois |
| 70 | Marjorie Spence | 2 | Daughter | — | Illinois |
| 71 | John Farrell | 49 | Head | Clerk | Illinois |
| 72 | Anna Farrell | 51 | Wife | — | Ireland |
| 73 | John Farrell | 27 | Son | Salesman | Illinois |
| 74 | Anna Farrell | 17 | Daughter | — | Illinois |
| 75 | William Farrell | 16 | Son | — | Illinois |
| 76 | Mary Sears THIS PERSON | 26 | Daughter | Cashier | Illinois |
| 77 | Katherine Scullion | 67 | Head | — | Ireland |
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)