JK
James Kirby — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this James Kirby across the 1910, 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed), with identified parents Joseph & Lulu — first a head (b.~1908), then head of a 3-person household.
Age 32
b. ~1908
Male
Head
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Kirby |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Occupation | Clerk |
| Industry | City Hall |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 900 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Clerk |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1908 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Matilda Kirby | Spouse | — | 38 | ~1902 |
| James Kirby | Head | — | 32 | ~1908 |
| Arthur Kirby | Son | — | 4 | ~1936 |
Census Appearances
1910
San Francisco, …
Son, age 2
San Francisco, California · implied b. ~1908 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kirby |
| Given Name | James G |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| 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, …
Son, age 12
San Francisco, California · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kirby |
| Given Name | James A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| 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, …
Son, age 22
San Francisco, California · implied b. ~1908 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kirby |
| Given Name | James A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | Law Student |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Head, age 32
San-Francisco-County, California · implied b. ~1908 — 3 household members
| Surname | Kirby |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Occupation | Clerk |
| Industry | City Hall |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 900 |
| 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 Kirby across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Kirby (~0.92 confidence) and mother Lulu Kirby (~0.92 confidence) and mother Lulu Kirby (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Kirby
b. ~1873
Source father
● Household
· direct · ~0.92
Mother
Lulu Kirby
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Lulu Kirby
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Kirby
Head · 1940 · age 32 · b. ~1908 · California
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — San-Francisco-County, California
Open full size
1940 US Federal Census — San-Francisco-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00308-00342)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Julia Mcgrady | 62 | Housekeeper | Housekeeper | California |
| 2 | Eugene Chapelle | 43 | Head | Clerk | England |
| 3 | Dolores Chapelle | 43 | Wife | — | California |
| 4 | Eugene Chapelle | 9 | Son | — | California |
| 5 | Mary Chapelle | 7 | Daughter | — | California |
| 6 | Thomas Clarke | 48 | Head | Bartender | Free State |
| 7 | Mary Clarke | 46 | Wife | — | California |
| 8 | Melvin La Voy | 18 | Step-son | — | California |
| 9 | Ella Caffee | 70 | Head | — | Free State |
| 10 | Mary Caffee | 75 | Sister | — | Free State |
| 11 | Arthur Gibbs | 41 | Head | Yardman | Canada |
| 12 | Velma Gibbs | 36 | Wife | — | Indiana |
| 13 | Dorothy Gibbs | 11 | Daughter | — | Colorado |
| 14 | Donald Gibbs | 7 | Son | — | Colorado |
| 15 | Adela Cochran | 62 | Head | — | California |
| 16 | Augusta Cooney | 64 | Sister | — | California |
| 17 | Ruth Cooney | 33 | Niece | — | California |
| 18 | George Roth | 46 | Head | Mechanic | New York |
| 19 | Helen Roth | 40 | Wife | — | Michigan |
| 20 | Katherine Happ | 18 | Daughter | Cashier | California |
| 21 | Fred Johnson | 27 | Son-in-law | Usher | Utah |
| 22 | Eleanor Johnson | 20 | Daughter | Usherette | California |
| 23 | Louis Reimer | 45 | Head | — | Illinois |
| 24 | Donald Reimer | 14 | Son | — | Illinois |
| 25 | Richard Reimer | 7 | Son | — | Washington |
| 26 | Robert Shultz | 43 | Head | Salesman | Washington |
| 27 | Evelyn Shultz | 22 | Daughter | Baker | Illinois |
| 28 | Eva Davidson | 51 | Head | Nurse | Oregon |
| 29 | Thomas Davidson | 22 | Son | Cabinet Maker | California |
| 30 | Maxine Davidson | 15 | Daughter | — | California |
| 31 | James Kirby THIS PERSON | 32 | Head | Clerk | California |
| 32 | Matilda Kirby | 38 | Wife | — | California |
| 33 | Arthur Kirby | 4 | Son | — | California |
| 34 | Alfred Nielsen | 53 | Head | Contractor | Norway |
| 35 | Saga Nielsen | 49 | Wife | Presser | Norway |
| 36 | Norma Nielsen | 20 | Daughter | — | Oregon |
| 37 | Robert Hoyer | 26 | Head | Clerk | Oklahoma |
| 38 | Claire Hoyer | 26 | Wife | — | Louisiana |
| 39 | Richard Hoyer | 2 | Son | — | California |
| 40 | Herbert Skinner | 73 | Head | Bookkeeper | New York |
Pedigree Summary
James
Gen 1 · 3 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)