WM
William Mccarthy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this William Mccarthy across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed), with identified parents Cornelius & Dan — first a son (b.~1919), then head of a 7-person household.
Age 21
b. ~1919
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | McCarthy |
| Given Name | William H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Alhambra City |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Occupation | Laborer |
| Industry | Pac. Granite |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 788 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Laborer |
| Township / Ward | Alhambra City |
| Est. Birth Year | ~1919 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Theresa Mccarthy | Daughter | — | 13 | ~1927 |
| Dan Mccarthy | Head | — | 53 | ~1887 |
| Vincent Mccarthy | Son | — | 16 | ~1924 |
| John Mccarthy | Son | — | 23 | ~1917 |
| Thomas Mccarthy | Son | — | 25 | ~1915 |
| William Mccarthy | Son | — | 21 | ~1919 |
| Cornelius Mccarthy | Son | — | 9 | ~1931 |
Census Appearances
1920
Los Angeles, …
Son, age 1
Los Angeles, California · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Missouri |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Los Angeles, …
Son, age 11
Los Angeles, California · implied b. ~1919 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Missouri |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Son, age 21
Los-Angeles-County, California · implied b. ~1919 — 7 household members
| Surname | McCarthy |
| Given Name | William H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Alhambra City |
| 1935 Residence (County) | Los Angeles |
| Occupation | Laborer |
| Industry | Pac. Granite |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 788 |
| Highest Grade | H 4 |
| 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 William Mccarthy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Cornelius Mccarthy (~0.92 confidence) and father Dan Mccarthy (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Cornelius Mccarthy
b. ~1882
Source father
● Household
· direct · ~0.92
Father
Dan Mccarthy
b. ~1887
Source father
● Household
· direct · ~0.92
This person
Anchor record
William Mccarthy
Son · 1940 · age 21 · b. ~1919 · California
★ You are viewing this record
Sibling
Vincent Mccarthy
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Mccarthy
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cornelius Mccarthy
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mccarthy
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mccarthy
Sibling · 1940 · age 23
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
1940 US Federal Census — Los-Angeles-County, California
Open full size
1940 US Federal Census — Los-Angeles-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00252-00210)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Josephine Carrolls | 15 | Daughter | — | California |
| 2 | Gilbert Carrolls | 7 | Son | — | California |
| 3 | George Carrolls | 2 | Son | — | California |
| 4 | Joseph Sperra | 74 | Head | Ot | Italy |
| 5 | Louise Sperra | 44 | Wife | H | Italy |
| 6 | William J. Carter | 70 | Head | Office Work | Connecticut |
| 7 | Myrtle M. E. Carter | 66 | Wife | H | Missouri |
| 8 | Jessie M. Mcbain | 48 | Head | Misc Worker | Oklahoma |
| 9 | Mickie Mcbain | 9 | Son | — | California |
| 10 | Laura Thomas | 78 | Mother | U | Indiana |
| 11 | Jessie B. Fullhart | 51 | Sister | H | Kansas |
| 12 | Pat M. Mcnally | 37 | Head | Electrician | California |
| 13 | Peggy Mcnally | 30 | Wife | H | Texas |
| 14 | Ronald Mcnally | 6 | Son | — | California |
| 15 | Edward R. Mckerry | 76 | Head | Ot | North Ireland |
| 16 | Margaret Mckerry | 78 | Wife | H | North Ireland |
| 17 | John W. Umbarger | 58 | Head | Maintenance | Nebraska |
| 18 | Lillian L. Umbarger | 44 | Wife | H | Illinois |
| 19 | John W. Umbarger | 16 | Son | — | California |
| 20 | Gladys L. Umbarger | 15 | Daughter | — | California |
| 21 | Thelma J. Umbarger | 10 | Daughter | — | California |
| 22 | Frank D. Pope | 52 | Head | Barber | Ohio |
| 23 | Marie G. Pope | 50 | Wife | H | Ohio |
| 24 | Mary S. Pope | 19 | Daughter | Secretary | Ohio |
| 25 | Jeanat Pope | 17 | Daughter | H | Ohio |
| 26 | Dan D. Mccarthy | 53 | Head | H | Missouri |
| 27 | Thomas J. Mccarthy | 25 | Son | Boiler Maker | California |
| 28 | John P. Mccarthy | 23 | Son | Laborer | California |
| 29 | William H. Mccarthy THIS PERSON | 21 | Son | Laborer | California |
| 30 | Vincent F. Mccarthy | 16 | Son | S | California |
| 31 | Theresa L. Mccarthy | 13 | Daughter | — | California |
| 32 | Cornelius F. Mccarthy | 9 | Son | — | California |
| 33 | Thomas G. Dixon | 57 | Head | Broker | Kansas |
| 34 | Selma Dixon | 55 | Wife | H | Texas |
| 35 | Bernice Dunlap | 75 | Daughter | — | Texas |
| 36 | William S. Warner | 66 | Head | Ot | Missouri |
| 37 | Minnie B. Warner | 60 | Wife | H | Missouri |
| 38 | Frederick Taylor | 25 | Head | Bookkeeper | Minnesota |
| 39 | Martha S. Taylor | 25 | Wife | H | Missouri |
| 40 | Patricia S. Taylor | 0 | Daughter | — | California |
Pedigree Summary
William + 5 siblings
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)