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Mary Mayer — 1920 US Census Record
Model Tree available1920 United States Federal Census · San Francisco, California
Our Model Tree links this Mary Mayer across the 1910, 1920 and 1930 US Censuses in San Francisco, California (XGBoost, ~Confirmed), with identified parents Sophie & Emma — first a daughter (b.~1904), then head of a 5-person household.
Age 16
b. ~1904
Female
Daughter
Born: California
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | San Francisco, California |
| Surname | Mayer |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Additional Details | |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1904 |
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.
5 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mayer | Daughter | — | 16 | ~1904 |
| Sophie Mayer | Head | — | 50 | ~1870 |
| William Mayer | Son | — | 12 | ~1908 |
| John Mayer | Son | — | 14 | ~1906 |
| Emma Mayer | Spouse | — | 48 | ~1872 |
Census Appearances
1910
San Francisco, …
Daughter, age 6
San Francisco, California · implied b. ~1904 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mayer |
| Given Name | Marie C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1920
San Francisco, …
Daughter, age 16
San Francisco, California · implied b. ~1904 — 5 household members
| Surname | Mayer |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Daughter, age 26
San Francisco, California · implied b. ~1904 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mayer |
| Given Name | Mae |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | Stenographer |
| Industry | Music House |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 Mayer across 3 US Census years (1910, 1920 and 1930) in San Francisco, California, using XGBoost record linkage. Identified parents: mother Sophie Mayer (~0.92 confidence) and mother Emma Mayer (~0.92 confidence) and mother Annie Mayer (~0.92 confidence) and father August Mayer (~0.92 confidence) and father August Mayer (~0.92 confidence) and mother Minnie Mayer (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Sophie Mayer
b. ~1870
Source mother
● Household
· direct · ~0.92
Mother
Emma Mayer
b. ~1872
Source mother
● Household
· direct · ~0.92
Mother
Annie Mayer
b. ~1877
Source mother
● Household
· direct · ~0.92
Father
August Mayer
b. ~1877
Source father
● Household
· direct · ~0.92
Father
August Mayer
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Minnie Mayer
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Mayer
Daughter · 1920 · age 16 · b. ~1904 · California
★ You are viewing this record
Sibling
John Mayer
Sibling · 1920 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mayer
Sibling · 1920 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — San Francisco, California
Open full size
1920 US Federal Census — San Francisco, California
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu135unit:0126)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Barbara Barnett | 85 | Mother-in-law | — | Germany |
| 2 | Gustav Bergman | 57 | Head | Confectioner | California |
| 3 | Julius Bergman | 60 | Brother | Shoe Maker | California |
| 4 | Charles Marshall | 45 | Head | Agent | United States |
| 5 | Agnes F. Marshall | 32 | Wife | — | Oregon |
| 6 | Marshall Marshall | 16 | Son | — | California |
| 7 | William Greene | 52 | Head | Teamster | Maine |
| 8 | Edith E. Greene | 52 | Wife | — | Canada |
| 9 | Bernard Walker | 33 | Lodger | Electrician | United States |
| 10 | James Ellis | 48 | Lodger | Machinist | Canada |
| 11 | William Lowe | 50 | Lodger | Baker | California |
| 12 | William Shall | 40 | Head | Clerk | California |
| 13 | Bessie Shall | 36 | Wife | — | California |
| 14 | Roy E. Shall | 15 | Daughter | — | California |
| 15 | Joseph Christensen | 35 | Head | Brickmason | Denmark |
| 16 | Petra Christensen | 35 | Wife | — | Denmark |
| 17 | Elwin Christensen | 15 | Son | — | Denmark |
| 18 | Marjorie Christensen | 7 | Daughter | — | Australia |
| 19 | Will Wolf | 40 | Lodger | Conductor | Denmark |
| 20 | Edward Brandt | 60 | Head | Baker | Germany |
| 21 | Elizabeth Brandt | 47 | Wife | — | Mexico |
| 22 | William Brandt | 12 | Daughter | — | California |
| 23 | Manuel Avery | 33 | Son-in-law | Bookkeeper | Mexico |
| 24 | Julian De Evans | 58 | Head | Porter | England |
| 25 | Rose Evans | 56 | Wife | — | California |
| 26 | Charles Evans | 27 | Son | Inspector | California |
| 27 | Robert E. Evans | 24 | Son | Chauffeur | California |
| 28 | William Callery | 34 | Head | Cook | Denmark |
| 29 | Christine Callery | 35 | Wife | — | Denmark |
| 30 | Rose Callery | 11 | Daughter | — | California |
| 31 | William Callery | 5 | Son | — | California |
| 32 | James Parsons | 50 | Head | — | California |
| 33 | Francis M. Parsons | 31 | Son | Machinist | California |
| 34 | Edmund Parsons | 23 | Son | Machinist | California |
| 35 | Henry W. Madsen | 49 | Head | Musician | Sweden |
| 36 | Arthur H. Madsen | 28 | Son | Messenger | California |
| 37 | May Florence Madsen | 26 | Daughter | Actress | California |
| 38 | Sarah Bettman | 55 | Head | — | Russia |
| 39 | Mary Bettman | 32 | Daughter | — | Russia |
| 40 | Benjamin Bettman | 30 | Son | Book Binder | Russia |
| 41 | Sophie Mayer | 50 | Head | Seamstress | California |
| 42 | Emma J. Mayer | 48 | Wife | — | California |
| 43 | Mary J. Mayer THIS PERSON | 16 | Daughter | — | California |
| 44 | John H. Mayer | 14 | Son | — | California |
| 45 | William J. Mayer | 12 | Son | — | California |
| 46 | Vincent J. Costa | 37 | Head | Bootblack | Italy |
| 47 | John Costa | 12 | Son | — | Italy |
| 48 | Mary Costa | 10 | Daughter | — | Italy |
| 49 | Amelia Costa | 8 | Daughter | — | Italy |
| 50 | Eleanor Costa | 6 | Daughter | — | Italy |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 6 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)