MC
Mary Clancy — 1920 US Census Record
Linked across censuses1920 United States Federal Census · San Francisco, California
Our Model Tree links this Mary Clancy across the 1920 and 1930 US Censuses in San Francisco, California (XGBoost, ~Confirmed) — first a daughter (b.~1909), then head of a 11-person household.
Age 11
b. ~1909
Female
Daughter
Born: California
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | San Francisco, California |
| Surname | Clancy |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Additional Details | |
| Occupation | none |
| 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 | ~1909 |
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.
11 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Edward Clancy | Other | — | 36 | ~1884 |
| John Clancy | Son | — | 7 | ~1913 |
| Virginia Clancy | Daughter | — | 3 | ~1917 |
| Georgiana Clancy | Daughter | — | 9 | ~1911 |
| Genevieve Clancy | Daughter | — | 9 | ~1911 |
| Claire Clancy | Daughter | — | 1 | ~1919 |
| Mary Clancy | Daughter | — | 11 | ~1909 |
| John Clancy | Head | — | 35 | ~1885 |
| James Clancy | Other | — | 24 | ~1896 |
| Patricia Clancy | Daughter | — | 5 | ~1915 |
| Mary Clancy | Spouse | — | 37 | ~1883 |
Census Appearances
1920
San Francisco, …
Daughter, age 11
San Francisco, California · implied b. ~1909 — 11 household members
| Surname | Clancy |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Daughter, age 22
San Francisco, California · implied b. ~1908 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clancy |
| Given Name | Marion |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | Stenographer |
| Industry | Cheese |
| 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 Clancy across 2 US Census years (1920 and 1930) in San Francisco, California, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Clancy
Daughter · 1920 · age 11 · b. ~1909 · California
★ You are viewing this record
Sibling
John Clancy
Sibling · 1920 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Georgiana Clancy
Sibling · 1920 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia Clancy
Sibling · 1920 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Clancy
Sibling · 1920 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Genevieve Clancy
Sibling · 1920 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Claire Clancy
Sibling · 1920 · age 1
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
51 people indexed on this census page (ia:1920:14thcensusofpopu142unit:0252)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Leslie A Donahue | 58 | head | Architect | New York |
| 2 | Velma Donahue | 37 | wife | None | Mexico |
| 3 | Fred A Leilani | 60 | head | Photographer | Denmark |
| 4 | Susan Leilani | 55 | wife | None | California |
| 5 | Frances Leilani | 26 | daughter | Saleslady | California |
| 6 | Hattie Leilani | 24 | daughter | None | California |
| 7 | Frances Mecham | 4 | grand dau | None | California |
| 8 | George Mecham | 2 | grand son | None | California |
| 9 | Michael Kovachich | 42 | head | Conductor | Hungary |
| 10 | Veronica Kovachich | 30 | wife | None | Hungary |
| 11 | John Bertoni | 30 | head | Merchant | Italy |
| 12 | Cesira Bertoni | 29 | wife | None | Italy |
| 13 | Carl L Halvorsen | 57 | head | Longshoreman | Norway |
| 14 | Johanna Halvorsen | 55 | wife | None | Norway |
| 15 | James Halvorsen | 22 | son | Longshoreman | California |
| 16 | Gustav W Wilde | 39 | head | Painter Contractor | Germany |
| 17 | (See Line 45 & 46) Wilde | None | — | — | — |
| 18 | Frank Delchiaro | 33 | head | Laborer | Italy |
| 19 | Lorenza Delchiaro | 28 | wife | None | Italy |
| 20 | Alfred Delchiaro | 10 | son | None | Italy |
| 21 | William Delchiaro | 8 | son | None | California |
| 22 | George Delchiaro | 3 | daughter | None | California |
| 23 | John J Clancy | 35 | head | Painter | California |
| 24 | Mary J Clancy | 37 | wife | None | California |
| 25 | Mary Clancy THIS PERSON | 11 | daughter | None | California |
| 26 | Genevieve Clancy | 9 | daughter | None | California |
| 27 | Georgiana Clancy | 9 | daughter | None | California |
| 28 | John Clancy | 7 | son | None | California |
| 29 | Patricia Clancy | 5 | daughter | None | California |
| 30 | Virginia Clancy | 3 | daughter | None | California |
| 31 | Claire Clancy | 1 | daughter | None | California |
| 32 | Edward J Clancy | 36 | brother | Painter | California |
| 33 | James Clancy | 24 | brother | Salesman | California |
| 34 | Henry Roche | 44 | head | Steamfitter | California |
| 35 | Louise Roche | 37 | wife | None | Germany |
| 36 | August Holdenbury | 16 | step son | Laborer | California |
| 37 | William Holdenbury | 14 | step son | Laborer | California |
| 38 | Harry Langton | 39 | head | Machinist | Washington |
| 39 | Martha Langton | 30 | wife | None | Michigan |
| 40 | Martha Louise Langton | 12 | step daughter | None | California |
| 41 | Emily Langton | 10 | step daughter | None | California |
| 42 | William Sales | 35 | head | Packer | California |
| 43 | Mabel E Sales | 32 | wife | None | California |
| 44 | Lyman G Sales | 11 | son | None | California |
| 45 | Ruth E Sales | 6 | daughter | None | California |
| 46 | Morris Abergall | 37 | head | Peddler | California |
| 47 | Hilda Abergall | 30 | wife | None | Iowa |
| 48 | James T Fowler | 49 | head | Engineer | Kentucky |
| 49 | Sarah Fowler | 39 | wife | None | England |
| 50 | Lloyd J Anthony | 47 | head | Teamster | England |
| 51 | Catherine Anthony | 44 | wife | None | Illinois |
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)