MD
Mary Dempsey — 1920 US Census Record
Linked across censuses1920 United States Federal Census · San Francisco, California
Our Model Tree links this Mary Dempsey across the 1910 and 1920 US Censuses in San Francisco, California (XGBoost, ~Confirmed) — first a daughter (b.~1902), then head of a 8-person household.
Age 18
b. ~1902
Female
Daughter
Born: California
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | San Francisco, California |
| Surname | Dempsey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| 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 | 39 Precinct |
| Est. Birth Year | ~1902 |
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.
8 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| William Dempsey | Son | — | 14 | ~1906 |
| Francis Dempsey | Son | — | 10 | ~1910 |
| Beatrice Dempsey | Daughter | — | 20 | ~1900 |
| Mary Dempsey | Daughter | — | 18 | ~1902 |
| Rose Dempsey | Daughter | — | 16 | ~1904 |
| James Dempsey | Son | — | 12 | ~1908 |
| Willie Dempsey | Head | — | 51 | ~1869 |
| Mary Dempsey | Spouse | — | 47 | ~1873 |
Census Appearances
1910
San Francisco, …
Daughter, age 7
San Francisco, California · implied b. ~1903 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | none |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1920
San Francisco, …
Daughter, age 18
San Francisco, California · implied b. ~1902 — 8 household members
| Surname | Dempsey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| 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 |
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 Dempsey across 2 US Census years (1910 and 1920) in San Francisco, California, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Dempsey
Daughter · 1920 · age 18 · b. ~1902 · California
★ You are viewing this record
Sibling
James Dempsey
Sibling · 1920 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Beatrice Dempsey
Sibling · 1920 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Dempsey
Sibling · 1920 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Dempsey
Sibling · 1920 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Dempsey
Sibling · 1920 · age 14
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:1920:14thcensusofpopu132unit:0877)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Floyd Harris | 40 | Head | Broker | Illinois |
| 2 | Gertrude Harris | 30 | Wife | — | Oregon |
| 3 | Valentine Harris | 37 | Sister | — | Illinois |
| 4 | Cecelia Harris | 60 | Mother | — | Alsace Lorraine |
| 5 | Joseph Babcock | 51 | Head | Laborer | New York |
| 6 | Effie Babcock | 47 | Wife | — | California |
| 7 | William Babcock | 20 | Son | Embosser | California |
| 8 | Madeline Babcock | 18 | Daughter | Paster | California |
| 9 | Josephine Babcock | 16 | Daughter | — | California |
| 10 | Joseph Giusti | 38 | Head | Laborer | Italy |
| 11 | Maria Giusti | 30 | Wife | — | Italy |
| 12 | John Giusti | 8 | Son | — | Italy |
| 13 | Mary Giusti | 6 | Daughter | — | California |
| 14 | Nathan Allen | 26 | Head | Teamster | California |
| 15 | Edith Allen | 21 | Wife | — | California |
| 16 | Louis Giusti | 25 | Boarder | Cook | Italy |
| 17 | Justin Giusti | 22 | Boarder | — | Italy |
| 18 | Angelo Giusti | 18 | Boarder | — | Italy |
| 19 | Jack Cordero | 45 | Head | Window Washer | Italy |
| 20 | Teresa Cordero | 41 | Wife | — | California |
| 21 | Angelo Giusti | 40 | Boarder | Laborer | Italy |
| 22 | Frederick Jackson | 46 | Head | — | California |
| 23 | Frances Jackson | 46 | Wife | Messenger | California |
| 24 | Jack Jackson | 16 | Son | — | California |
| 25 | Domenico Pancanelli | 52 | Head | — | Italy |
| 26 | Carmela Pancanelli | 43 | Wife | — | California |
| 27 | George Pancanelli | 20 | Son | Bottle Washer | California |
| 28 | Giacomo Balbi | 39 | Head | Grocer | Italy |
| 29 | Maria Balbi | 22 | Wife | — | Italy |
| 30 | Agosto Brizzolara | 30 | Boarder | Soldier | Italy |
| 31 | Alfredo Antonielli | 34 | Head | Grocer | Italy |
| 32 | Antonelli Antonielli | 25 | Wife | — | Italy |
| 33 | Elena Antonielli | 3 | Daughter | — | California |
| 34 | Emilia Antonielli | 1 | Daughter | — | California |
| 35 | Emanuele Magnani | 30 | Boarder | Dripfiller | Italy |
| 36 | Mary Gerald | 57 | Head | Janitress | Ireland |
| 37 | Frank Gerald | 31 | Son | Washer | Massachusetts |
| 38 | Willie Dempsey | 51 | Head | Storekeeper | Ireland |
| 39 | Mary Dempsey | 47 | Wife | — | Ireland |
| 40 | Beatrice Dempsey | 20 | Daughter | Box Maker | California |
| 41 | Mary Dempsey THIS PERSON | 18 | Daughter | — | California |
| 42 | Rose Dempsey | 16 | Daughter | — | California |
| 43 | William Dempsey | 14 | Son | Helper | California |
| 44 | James Dempsey | 12 | Son | Helper | California |
| 45 | Francis Dempsey | 10 | Son | — | California |
| 46 | Axel Wickborn | 35 | Head | Coppersmith | Sweden |
| 47 | Mabel Wickborn | 23 | Wife | — | California |
| 48 | Christiana Paulson | 55 | Mother in law | — | Sweden |
| 49 | — | None | — | — | — |
| 50 | — | None | — | — | — |
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)