MP
Mary Pearson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Pearson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1875), then head of a 4-person household.
Age 65
b. ~1875
Female
Spouse
Born: Sweden
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Pearson |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1875 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Ruth Pearson | Daughter | — | 22 | ~1918 |
| Andrew Pearson | Head | — | 66 | ~1874 |
| William Pearson | Son | — | 32 | ~1908 |
| Mary Pearson | Spouse | — | 65 | ~1875 |
Census Appearances
1920
Cook, Illinois
Other, age 48
Cook, Illinois · implied b. ~1872 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Persson |
| Given Name | Maria J |
| Relationship to Head | Maid |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Single |
| Birthplace | Sweden |
| Year of Immigration | 1891 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Cook |
| Industry | Private Family |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Birth Country | Sweden |
| Year of Naturalization | 1919 |
| Birthplace (normalized) | sweden |
1930
Cook, Illinois
Other, age 56
Cook, Illinois · implied b. ~1874 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Pearson |
| Given Name | Mary |
| Relationship to Head | Servant |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Single |
| Birthplace | Sweden |
| Naturalization Status | Naturalized |
| Year of Immigration | 1892 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Cook |
| Industry | Private Home |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1940
Cook-County, Illinois
Spouse, age 65
Cook-County, Illinois · implied b. ~1875 — 4 household members
| Surname | Pearson |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
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 Pearson 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 Pearson
Spouse · 1940 · age 65 · b. ~1875 · 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
39 people indexed on this census page (nara:1940:m-t0627-00942-00648)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frank J. | 20 | son | Clerk | Illinois |
| 2 | Dorothy | 14 | daughter | Machinist | Illinois |
| 3 | — | 50 | brother | Machinist | Illinois |
| 4 | Carolyn | 73 | mother | — | Illinois |
| 5 | August Holman | 52 | head | Oiler | Illinois |
| 6 | Idal Holman | 57 | wife | — | Illinois |
| 7 | Marcella | 30 | daughter | — | Illinois |
| 8 | Stanley | 33 | son-in-law | Order Clerk | Poland |
| 9 | James | 6 | grandson | — | Illinois |
| 10 | Shirley Jean | 3 | granddaughter | — | Illinois |
| 11 | Raymond Macfarlane | 39 | head | Tester | Wisconsin |
| 12 | Harriet Macfarlane | 38 | wife | — | Wisconsin |
| 13 | Donald Macfarlane | 9 | son | — | Wisconsin |
| 14 | Arlene Macfarlane | 8 | daughter | — | Indiana |
| 15 | Albert Skilbie | 57 | head | Clerk | Indiana |
| 16 | Sadie Skilbie | 54 | wife | — | Indiana |
| 17 | Evelyn Skilbie | 26 | daughter | Stenographer | Illinois |
| 18 | Clifford Skilbie | 22 | son | Laborer | Illinois |
| 19 | Ruth Skilbie | 16 | daughter | — | Indiana |
| 20 | Mary S. Skilbie | 10 | daughter | — | Indiana |
| 21 | Leo Erickson | 38 | head | Timekeeper | Illinois |
| 22 | Dorothy Erickson | 33 | wife | — | Illinois |
| 23 | Simon Raway | 52 | head | Salesman | Hungary |
| 24 | Mary Raway | 50 | wife | Storekeeper | Hungary |
| 25 | Herbert Raway | 18 | son | — | Illinois |
| 26 | Donald O'Byrne | 37 | head | Clerk | Illinois |
| 27 | Michael O'Byrne | 69 | father | — | England |
| 28 | Nina O'Byrne | 61 | mother | — | England |
| 29 | Marjorie O'Byrne | 19 | sister | Clerk | Illinois |
| 30 | Robert O'Byrne | 16 | brother | — | Illinois |
| 31 | Andrew Pearson | 66 | head | Carpenter | Sweden |
| 32 | Mary Pearson THIS PERSON | 65 | wife | — | Sweden |
| 33 | William Pearson | 32 | son | Inspector | Illinois |
| 34 | Ruth Pearson | 22 | daughter | Stenographer | Illinois |
| 35 | Charles Lundholtz | 32 | head | Owner | Illinois |
| 36 | Edith Lundholtz | 30 | wife | — | Illinois |
| 37 | Charles Westling | 54 | head | Machinist | Illinois |
| 38 | Inha Westling | 50 | wife | — | Illinois |
| 39 | Erma Westling | 25 | daughter | Private Nurse | 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)