JK
John Kirby — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this John Kirby across the 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 8-person household.
Age 19
b. ~1921
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Kirby |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Occupation | New worker |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | New Worker |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1921 |
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 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Joseph Kirby | Son | — | 28 | ~1912 |
| Edward Toomey | Other | — | 20 | ~1920 |
| Margaret Kirby | Spouse | — | 53 | ~1887 |
| Mary Toomey | Daughter | — | 21 | ~1919 |
| William Kirby | Son | — | 25 | ~1915 |
| John Kirby | Son | — | 19 | ~1921 |
| David Kirby | Son | — | 16 | ~1924 |
| Patrick Kirby | Head | — | 58 | ~1882 |
Census Appearances
1930
San Francisco, …
Son, age 9
San Francisco, California · implied b. ~1921 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kirby |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Irish F.S. |
| Mother's Birthplace | Colorado |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Son, age 19
San-Francisco-County, California · implied b. ~1921 — 8 household members
| Surname | Kirby |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Occupation | New worker |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 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 John Kirby across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kirby
Son · 1940 · age 19 · b. ~1921 · California
★ You are viewing this record
Sibling
David Kirby
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Kirby
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Toomey
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Kirby
Sibling · 1940 · age 25
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 — 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-t0627-00312-00203)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Margaret Goldman | 60 | Wife | Housewife | California |
| 42 | Harold Goldman | 35 | Daughter | Bookkeeper | California |
| 43 | Gordon Goldman | 31 | Son | — | California |
| 44 | George F. Feusiery|Feusiere | 50 | Head | Marine Engineer | California |
| 45 | Angie Feusiery|Feusiere | 45 | Wife | Housewife | California |
| 46 | Stella Apperley|Apperly | 70 | Head | Housewife | Pennsylvania |
| 47 | Stella A. Apperley|Apperly | 47 | Daughter | Telephone Operator | Illinois |
| 48 | Thomas Rice | 52 | Son | Conductor | Texas |
| 49 | Ethel Rice | 49 | Daughter | Bookkeeper | Pennsylvania |
| 50 | Augustus R. Booth | 47 | Head | Salesman | Pennsylvania |
| 51 | Alice L. Booth | 47 | Wife | Housewife | Illinois |
| 52 | Alice L. Booth | 20 | Daughter | Clerical Assistant | California |
| 53 | Augustus R. Jr. Booth | 17 | Son | Baker | California |
| 54 | William C. Rice | 60 | Head | Mfg Agent | California |
| 55 | Virginia Rice | 60 | Wife | Housewife | Virginia |
| 56 | Extra Line | None | — | — | — |
| 57 | Wilmer G. Hubbard | 58 | Head | Wood-Worker | Indiana |
| 58 | Lulu Hubbard | 54 | Wife | Housewife | California |
| 59 | Mary F. Hubbard | 21 | Daughter | Stenographer | California |
| 60 | Josephine Mcnulty | 22 | Roomer | Stenographer | California |
| 61 | Nellie F. Peterson | 50 | Head | Teacher | California |
| 62 | Gunhilde Forsberg | 82 | Mother | — | Norway |
| 63 | Patrick Kirby | 58 | Head | Cable Splicer | Irish Free State |
| 64 | Margaret Kirby | 53 | Wife | Housewife | Colorado |
| 65 | Joseph Kirby | 28 | Son | Janitor | Colorado |
| 66 | William Kirby | 25 | Son | Warehouseman | So. Dakota |
| 67 | Edward Toomey | 20 | Son-in-law | News Worker | California |
| 68 | Mary Toomey | 21 | Daughter | Housewife | Arizona |
| 69 | John Kirby THIS PERSON | 19 | Son | New Worker | California |
| 70 | David Kirby | 16 | Son | — | California |
| 71 | William Williams | 78 | Head | — | Illinois |
| 72 | Matilda Ernest | 72 | Roomer | Masseuse | Nebraska |
| 73 | Minnie Vogelschutz | 63 | Lodger | — | Missouri |
| 74 | Walter Neill | 37 | Head | Druggist | California |
| 75 | Margaret Neill | 36 | Wife | Housewife | California |
| 76 | Marian Neill | 13 | Daughter | — | California |
| 77 | Walter Neill | 12 | Son | — | California |
| 78 | William Neill | 10 | Son | — | California |
| 79 | Joseph J. Silva | 58 | Head | Manager | Rhode Island |
| 80 | Lola Silva | 60 | Wife | Housewife | Iowa |
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)