MK
Mary Knox — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Knox across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1891), then head of a 8-person household.
Age 49
b. ~1891
Female
Spouse
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Knox |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1891 |
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 |
|---|---|---|---|---|
| Mary Stastny | Daughter | — | 27 | ~1913 |
| James Knox | Son | — | 18 | ~1922 |
| Patrick Knox | Head | — | 50 | ~1890 |
| Patrick Knox | Son | — | 20 | ~1920 |
| Edward Knox | Son | — | 22 | ~1918 |
| Mary Knox | Spouse | — | 49 | ~1891 |
| Eugene Knox | Son | — | 18 | ~1922 |
| James Stastny | Other | — | 7 | ~1933 |
Census Appearances
1930
Cook, Illinois
Spouse, age 39
Cook, Illinois · implied b. ~1891 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knox |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 20 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Spouse, age 49
Cook-County, Illinois · implied b. ~1891 — 8 household members
| Surname | Knox |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Illinois |
| 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 Knox across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Knox
Spouse · 1940 · age 49 · b. ~1891 · 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-t0627-00957-00548)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Kemphouse | 28 | Son | Dormin Clerk | Illinois |
| 42 | Rudolph Strich | 59 | Head | Motorman | Germany |
| 43 | Mary Strich | 51 | Wife | — | Ireland |
| 44 | George Strich | 29 | Son | Truck Driver | Illinois |
| 45 | Joseph Strich | 24 | Son | Janitor | Illinois |
| 46 | Edward Strich | 22 | Son | Laborer | Illinois |
| 47 | Michael Conrad | 33 | Son-in-law | Manager | Illinois |
| 48 | Rae Conrad | 28 | Daughter | — | Illinois |
| 49 | Mary Conrad | 7 | Grand-daughter | — | Illinois |
| 50 | Lorraine Conrad | 5 | Grand-daughter | — | Illinois |
| 51 | Michael Jr. Conrad | 4 | Grand-son | — | Illinois |
| 52 | John Mast | 28 | Head | Electrician | Illinois |
| 53 | Eleanor Mast | 24 | Wife | — | Illinois |
| 54 | Mary Ann Mast | 4 | Daughter | — | Wisconsin |
| 55 | John Mast | 2 | Son | — | Illinois |
| 56 | John Goodwin | 39 | Head | Oiler Power House | N. Ireland |
| 57 | Mary Goodwin | 37 | Wife | — | Ireland |
| 58 | Joan Goodwin | 10 | Daughter | — | Illinois |
| 59 | John Goodwin | 9 | Son | — | Illinois |
| 60 | Maurine Goodwin | 4 | Daughter | — | Illinois |
| 61 | Nancy Goodwin | 2 | Daughter | — | Illinois |
| 62 | Harry Marquardt | 41 | Head | Scale Mechanic | Illinois |
| 63 | Sadie Marquardt | 41 | Wife | — | Illinois |
| 64 | John Marquardt | 12 | Son | — | Illinois |
| 65 | Richard Marquardt | 8 | Son | — | Illinois |
| 66 | Harry Marquardt | 6 | Son | — | Illinois |
| 67 | Mary Lemke | 67 | Mother-in-law | — | Illinois |
| 68 | Edwin Lemke | 44 | Brother-in-law | Sign Painter | Illinois |
| 69 | Otto Burmeister | 51 | Head | Chauffeur | Illinois |
| 70 | Elizabeth Burmeister | 55 | Wife | — | Illinois |
| 71 | George Eckert | 62 | Head | Baker | Germany |
| 72 | Mary Eckert | 33 | Daughter | Book-Keeper | Illinois |
| 73 | Patrick Knox | 50 | Head | General Foreman | Illinois |
| 74 | Mary Knox THIS PERSON | 49 | Wife | — | Illinois |
| 75 | Mary Stastny | 27 | Daughter | — | Illinois |
| 76 | James Stastny | 7 | Grand-son | — | Illinois |
| 77 | Edward Knox | 22 | Son | Laborer | Illinois |
| 78 | Patrick Knox | 20 | Son | Chauffeur | Illinois |
| 79 | Eugene Knox | 18 | Son | New Worker | Illinois |
| 80 | James Knox | 18 | Son | Laborer | 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)