MR
Mary Ross — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this Mary Ross across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed) — first a spouse (b.~1885), then head of a 3-person household.
Age 55
b. ~1885
Female
Spouse
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Ross |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Francisco City |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Industry | 0 |
| Highest Grade | H-8 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | San Francisco City |
| Est. Birth Year | ~1885 |
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 |
|---|---|---|---|---|
| Juanita Ross | Daughter | — | 22 | ~1918 |
| Howard Ross | Head | — | 56 | ~1884 |
| Mary Ross | Spouse | — | 55 | ~1885 |
Census Appearances
1920
San Francisco, …
Spouse, age 35
San Francisco, California · implied b. ~1885 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Ross |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | California |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Spouse, age 45
San Francisco, California · implied b. ~1885 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Ross |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | California |
| Age at First Marriage | 21 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Spouse, age 55
San-Francisco-County, California · implied b. ~1885 — 3 household members
| Surname | Ross |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Francisco City |
| 1935 Residence (County) | San Francisco |
| Industry | 0 |
| Highest Grade | H-8 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Ross 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 Ross
Spouse · 1940 · age 55 · b. ~1885 · 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
40 people indexed on this census page (nara:1940:m-t0627-00322-00061)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James Pera | 40 | Brother-in-law | Agent | Persia |
| 2 | Francis Dewitt | 40 | Head | Clerk | Nebraska |
| 3 | Mildred Dewitt | 40 | Wife | — | Washington |
| 4 | Egbert Willard | 48 | Head | Sutler | California |
| 5 | Wanitta Willard | 46 | Wife | — | California |
| 6 | Richard Willard | 19 | Son | — | California |
| 7 | Nathalie Willard | 16 | Daughter | — | California |
| 8 | Frances Willard | 12 | Daughter | — | California |
| 9 | Howard Ross | 56 | Head | Clerk | California |
| 10 | Mary Ross THIS PERSON | 55 | Wife | — | California |
| 11 | Juanita Ross | 22 | Daughter | Private Secretary | California |
| 12 | Samuel Piercy | 45 | Head | Sales Manager | California |
| 13 | Susan Piercy | 43 | Wife | — | California |
| 14 | Donald Piercy | 19 | Son | — | California |
| 15 | William Piercy | 14 | Son | — | California |
| 16 | Carrie Heitler | 64 | Head | — | Colorado |
| 17 | Karl W. Heitler | 62 | Brother | Salesman | Colorado |
| 18 | Mossop Thompson | 69 | Head | Salesman | Louisiana |
| 19 | Emma Thompson | 61 | Wife | — | Louisiana |
| 20 | Ralph Taylor | 54 | Head | Accountant | Nebraska |
| 21 | Alice Taylor | 52 | Wife | — | Illinois |
| 22 | Francis Small | 75 | Head | Engineer | California |
| 23 | Katherine Small | 60 | Wife | — | Massachusetts |
| 24 | Jacob Friedman | 60 | Head | — | Russia |
| 25 | Catherine Friedman | 52 | Wife | — | Iowa |
| 26 | Adele Maren Friedman | 33 | Daughter | — | Denmark |
| 27 | Boardman La Reine Friedman | 20 | Niece | — | Kansas |
| 28 | Wilfred Fairbanks | 25 | Head | Warehouseman | Washington |
| 29 | Dorothy Fairbanks | 19 | Wife | — | Washington |
| 30 | Fred Stephens | 56 | Head | Purchasing Agent | Australia |
| 31 | Elizabeth Stephens | 46 | Wife | — | England |
| 32 | Fred Stephens | 22 | Son | — | Montana |
| 33 | William Stephens | 20 | Son | — | Montana |
| 34 | Roy Le Due | 48 | Head | Real Estate Agt | Oregon |
| 35 | Gladys Le Due | 42 | Wife | — | California |
| 36 | Miller Carleshe Le Due | 18 | Step-Daughter | — | California |
| 37 | Romeo Rocca | 50 | Head | Plant Supt | California |
| 38 | Margaret Rocca | 49 | Wife | — | California |
| 39 | William Stevens | 44 | Head | Pilot | Connecticut |
| 40 | Edna Stevens | 46 | Wife | — | Oregon |
Related Census Records
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)