MC
Mary Carlson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this Mary Carlson across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed) — first a spouse (b.~1887), then head of a 3-person household.
Age 53
b. ~1887
Female
Spouse
Born: Finland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Carlson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Finland |
| 1935 Residence (City) | SAN FRANCISCO |
| 1935 Residence (County) | SAN FRANCISCO |
| Naturalization Status | Naturalized |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same House |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1887 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Carl Carlson | Head | — | 59 | ~1881 |
| Mary Carlson | Spouse | — | 53 | ~1887 |
| David Carlson | Son | — | 23 | ~1917 |
Census Appearances
1920
Alameda, California
Spouse, age 33
Alameda, California · implied b. ~1887 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carlson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Finland |
| Year of Immigration | 1908 |
| Naturalization Status | Alien |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
1930
San Francisco, …
Spouse, age 43
San Francisco, California · implied b. ~1887 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carlson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Finland |
| Naturalization Status | First papers filed |
| Year of Immigration | 1907 |
| Age at First Marriage | 25 |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | Finnish |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
1940
San-Francisco-County, California
Spouse, age 53
San-Francisco-County, California · implied b. ~1887 — 3 household members
| Surname | Carlson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Finland |
| 1935 Residence (City) | SAN FRANCISCO |
| 1935 Residence (County) | SAN FRANCISCO |
| Naturalization Status | Naturalized |
| Hours Worked | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same House |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
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 Carlson across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Carlson
Spouse · 1940 · age 53 · b. ~1887 · California
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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 — San-Francisco-County, California
Open full size
1940 US Federal Census — San-Francisco-County, California
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-00310-00277)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Timothy Costello | 64 | Head | — | Irish Free State |
| 2 | Kate Costello | 64 | Wife | — | Irish Free State |
| 3 | Mary Costello | 33 | Daughter | Stenographer | California |
| 4 | George Margolf | 75 | Head | — | France |
| 5 | Katherine Margolf | 71 | Wife | — | France |
| 6 | George Margolf | 49 | Son | Laborer | California |
| 7 | Carl O. Carlson | 59 | Head | Stevedore | Finland |
| 8 | Mary Carlson THIS PERSON | 53 | Wife | — | Finland |
| 9 | David Carlson | 23 | Son | — | California |
| 10 | Michael Dolan | 67 | Head | — | California |
| 11 | Mary Dolan | 66 | Wife | — | Irish Free State |
| 12 | Alice Nihil | 51 | Head | — | Irish Free State |
| 13 | Michael Nihil | 31 | Son | Truck Driver | California |
| 14 | Martin Nihil | 18 | Son | Cutter | California |
| 15 | James Nihil | 16 | Son | — | California |
| 16 | George Hogan | 31 | Head | Laborer | California |
| 17 | Alice Hogan | 27 | Wife | Operator | California |
| 18 | William Lima | 26 | Head | Feeder | California |
| 19 | Anita Lima | 28 | Wife | — | California |
| 20 | Iena Halburson | 80 | Head | — | Norway |
| 21 | John O'Rourke | 45 | Head | Driver | California |
| 22 | Jenny O'Rourke | 45 | Wife | — | California |
| 23 | Jack O'Rourke | 7 | Son | — | California |
| 24 | Joan O'Rourke | 5 | Daughter | — | California |
| 25 | Florence Ryan | 33 | Daughter | Packer | California |
| 26 | Stella Ryan | 25 | Daughter | Beauty Operator | California |
| 27 | Thomas Manion | 32 | Head | Motorcycle Driver | California |
| 28 | Beverly Manion | 20 | Wife | — | Maine |
| 29 | Carolyn Manion | 1 | Daughter | — | California |
| 30 | Elizabeth Chase | 65 | Grandmother | — | Maine |
| 31 | Walter Dickerson | 55 | Head | Waiter | Scotland |
| 32 | Marguerite Dickerson | 45 | Wife | — | Nebraska |
| 33 | Edith Carlson | 47 | Head | Operator | California |
| 34 | Jennie Carlson | 70 | Mother | — | Sweden |
| 35 | Robert Roberts | 15 | Nephew | — | California |
| 36 | Bernard Schneider | 33 | Head | Salesman | Nebraska |
| 37 | Frances Schneider | 30 | Wife | — | Nebraska |
| 38 | Bernard Schneider | 5 | Son | — | Nebraska |
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)