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Mary Larsen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Larsen across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1893), then head of a 2-person household.
Age 47
b. ~1893
Female
Head
Born: Norway
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Larsen |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Widowed |
| Birthplace | Norway |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No |
| 1935 Residence | Same house |
| Birth Country | Norway |
| Birthplace (normalized) | norway |
| Township / Ward | Chicago |
| Est. Birth Year | ~1893 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Larsen | Head | — | 47 | ~1893 |
| Lillian Larsen | Daughter | — | 24 | ~1916 |
Census Appearances
1920
Cook, Illinois
Other, age 28
Cook, Illinois · implied b. ~1892 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larsen |
| Given Name | Marie |
| Relationship to Head | Sister |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Norway |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Occupation | Stenographer |
| Industry | Wholesale |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Norwegian |
| Birth Country | Norway |
| Birthplace (normalized) | norway |
1930
Cook, Illinois
Other, age 39
Cook, Illinois · implied b. ~1891 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larsen |
| Given Name | Mary |
| Relationship to Head | Servant |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Norway |
| Naturalization Status | Naturalized |
| Year of Immigration | 1905 |
| Age at First Marriage | 39 |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Occupation | Servant |
| Industry | Private family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Norwegian |
| Birth Country | Norway |
| Birthplace (normalized) | norway |
1940
Cook-County, Illinois
Head, age 47
Cook-County, Illinois · implied b. ~1893 — 2 household members
| Surname | Larsen |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Widowed |
| Birthplace | Norway |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Highest Grade | No |
| 1935 Residence | Same house |
| Birth Country | Norway |
| Birthplace (normalized) | norway |
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 Larsen across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Larsen
Head · 1940 · age 47 · b. ~1893 · 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-t0627-00981-00097)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Savage | 59 | Brother | Office Clerk | Illinois |
| 2 | Henry Rinelli | 43 | Head | Proprietor | Italy |
| 3 | Ida Rinelli | 38 | Wife | — | Italy |
| 4 | Dolores Rinelli | 11 | Daughter | — | Illinois |
| 5 | Jeannine Rinelli | 8 | Daughter | — | Illinois |
| 6 | Adolph Bertogli | 39 | Cousin | Laborer | Italy |
| 7 | John Rinelli | 61 | Head | Assembler | Italy |
| 8 | Josephine Rinelli | 60 | Wife | — | Italy |
| 9 | Robert Rinelli | 23 | Son | Office Clerk | Illinois |
| 10 | Edith Rinelli | 21 | Daughter | Operator | Illinois |
| 11 | Castino Luzetti | 62 | Head | Operator | Italy |
| 12 | Mary Luzetti | 52 | Wife | — | Italy |
| 13 | Bruno Luzetti | 25 | Son | Copy Man | Illinois |
| 14 | Louis Minaglia | 41 | Head | Salesman | Italy |
| 15 | Helen Minaglia | 32 | Wife | — | Indiana |
| 16 | Louis Minaglia | 7 | Son | — | Illinois |
| 17 | Robert Minaglia | 0 | Son | — | Illinois |
| 18 | John Chonargewski | 67 | Head | Painter | Poland |
| 19 | Edith Chonargewski | 63 | Wife | — | Poland |
| 20 | Sam De Nuccio | 40 | Head | Clerk | Illinois |
| 21 | Catherine De Nuccio | 40 | Wife | — | Illinois |
| 22 | Le Roy De Nuccio | 3 | Son | — | Illinois |
| 23 | Rose De Nuccio | 80 | Mother | — | Italy |
| 24 | Anna Matthews | 30 | Lodger | Registered Nurse | Virginia |
| 25 | Ernie Schultz | 28 | Lodger | Registered Nurse | Missouri |
| 26 | Regina Ladwig | 21 | Lodger | Registered Nurse | Michigan |
| 27 | Hilda Steffen | 29 | Lodger | Graduate Nurse | Wisconsin |
| 28 | Viola Weller | 37 | Lodger | Graduate Nurse | Illinois |
| 29 | Joseph Waser | 36 | Head | Janitor | Switzerland |
| 30 | Lydia Waser | 33 | Wife | — | Germany |
| 31 | Lalavern Waser | 5 | Daughter | — | Illinois |
| 32 | Edwin Schirmer | 34 | Brother-in-law | Car Cleaner | Germany |
| 33 | Conrad Anderson | 56 | Head | Laborer | Sweden |
| 34 | Helma Anderson | 54 | Wife | — | Sweden |
| 35 | Margaret Johnson | 32 | Daughter | — | Illinois |
| 36 | Elof Johnson | 38 | Son-in-law | Machinist | Illinois |
| 37 | Paul Wilson | 47 | Head | Fireman | Illinois |
| 38 | Anna Wilson | 47 | Wife | — | Norway |
| 39 | Mary Larsen THIS PERSON | 47 | Head | — | Norway |
| 40 | Lillian Larsen | 24 | Daughter | Stenographer | 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)