JB
James Ball — 1940 US Census Record
Model Tree available1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this James Ball across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed), with identified parents Kathryn & Raymond — first a son (b.~1919), then head of a 4-person household.
Age 21
b. ~1919
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Ball |
| Given Name | James H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles City |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Occupation | Mechanic |
| Industry | Air Craft Construction |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1450 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Mechanic |
| Township / Ward | Los Angeles 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Raymond Ball | Son | — | 34 | ~1906 |
| James Ball | Son | — | 21 | ~1919 |
| Kathryn Ball | Spouse | — | 55 | ~1885 |
| Raymond Ball | Head | — | 55 | ~1885 |
Census Appearances
1920
Los Angeles, …
Son, age 1
Los Angeles, California · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Ball |
| Given Name | James A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Texas |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Los Angeles, …
Son, age 11
Los Angeles, California · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Ball |
| Given Name | James H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Texas |
| Mother's Birthplace | California |
| 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 — 4 household members
| Surname | Ball |
| Given Name | James H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles City |
| 1935 Residence (County) | Los Angeles |
| Occupation | Mechanic |
| Industry | Air Craft Construction |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1450 |
| 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 James Ball across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Kathryn Ball (~0.92 confidence) and father Raymond Ball (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Kathryn Ball
b. ~1885
Source mother
● Household
· direct · ~0.92
Father
Raymond Ball
b. ~1885
Source father
● Household
· direct · ~0.92
This person
Anchor record
James Ball
Son · 1940 · age 21 · b. ~1919 · California
★ You are viewing this record
Sibling
Raymond Ball
Sibling · 1940 · age 34
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-t0627-00422-00520)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Raymond Ball | 55 | Head | Policeman | Texas |
| 2 | Kathryn G. Ball | 55 | Wife | — | California |
| 3 | Raymond O. Ball | 34 | Son | Guard | California |
| 4 | James H. Ball THIS PERSON | 21 | Son | Mechanic | California |
| 5 | Gertrude Stucken | 49 | Head | Playground | Michigan |
| 6 | Doris Stucken | 20 | Daughter | Cashier | Illinois |
| 7 | Logan Wooddall | 37 | Lodger | Truck Driver | Georgia |
| 8 | Myrtle L. Samuel | 61 | Head | — | Illinois |
| 9 | Jean Davidson | 25 | Lodger | New Worker | Utah |
| 10 | Ray Mcmanus | 39 | Head | Contractor | Iowa |
| 11 | Agnes G. Mcmanus | 38 | Wife | — | S. Dakota |
| 12 | Verne A. Mcmanus | 14 | Son | — | California |
| 13 | Leone E. Mcmanus | 10 | Daughter | — | California |
| 14 | Dean Mcmanus | 6 | Son | — | California |
| 15 | Louis Stanghl | 27 | Head | Tile Setter | Minnesota |
| 16 | G. Arline Stanghl | 31 | Wife | Machine Operator | Ohio |
| 17 | Joshua D. Healy | 58 | Head | — | Mesopotamia |
| 18 | Ida M. Healy | 36 | Wife | 40 | Mesopotamia |
| 19 | Alice Healy | 15 | Daughter | — | Syria |
| 20 | James Healy | 12 | Step-son | — | California |
| 21 | Mary Healy | 8 | Daughter | — | California |
| 22 | Ned Mandell | 37 | Head | Assemblman | Illinois |
| 23 | Eleanor Mandell | 23 | Wife | — | Oklahoma |
| 24 | Donna M. Mandell | 1 | Daughter | — | California |
| 25 | Ronald N. Mandell | 0 | Son | — | California |
| 26 | Rosa E. Ryckman | 65 | Head | — | Utah |
| 27 | Beverly J. Ryckman | 11 | Grand-daughter | — | California |
| 28 | Fred M. Ryckman | 33 | Head | Clerk | Wyoming |
| 29 | Margaret Ryckman | 31 | Wife | — | Indiana |
| 30 | Edward M. Ruby | 53 | Head | Cabinet Maker | Ohio |
| 31 | Philomena Ruby | 55 | Wife | — | Ohio |
| 32 | Francis A. Ruby | 24 | Son | Technician | California |
| 33 | Joseph P. Ruby | 23 | Son | Messenger-Clerk | California |
| 34 | Vincent B. Ruby | 22 | Son | Clerk | California |
| 35 | Albert A. Ruby | 19 | Son | Messenger | California |
| 36 | Raymond Ruby | 15 | Son | — | California |
| 37 | Lola D. Hahn | 48 | Head | Stenographer | California |
| 38 | Edgar A. Bull | 57 | Head | Chief Clerk | Illinois |
| 39 | Evelyn L. Bull | 39 | Wife | — | Canada |
| 40 | Morris Arons | 57 | Head | Proprietor | Texas |
Pedigree Summary
James + 1 sibling
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)