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James Byrne — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Mateo-County, California
Our Model Tree links this James Byrne across the 1930 and 1940 US Censuses in San-Mateo-County, California (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 9-person household.
Age 23
b. ~1917
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Mateo-County, California |
| Surname | Byrne |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Daly City |
| 1935 Residence (County) | San Mateo |
| Additional Details | |
| Occupation | Caddy |
| Industry | Golf course |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 624 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Caddy |
| Township / Ward | Daly City |
| Est. Birth Year | ~1917 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Thomas Byrne | Son | — | 22 | ~1918 |
| Catherine Byrne | Daughter | — | 20 | ~1920 |
| Robert Byrne | Son | — | 28 | ~1912 |
| George Byrne | Son | — | 18 | ~1922 |
| William Byrne | Son | — | 16 | ~1924 |
| Robert Byrne | Head | — | 51 | ~1889 |
| Irene Byrne | Daughter | — | 15 | ~1925 |
| James Byrne | Son | — | 23 | ~1917 |
| Elmer Byrne | Spouse | — | 50 | ~1890 |
Census Appearances
1930
San Francisco, …
Son, age 13
San Francisco, California · implied b. ~1917 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Byrne |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Mateo-County, California
Son, age 23
San-Mateo-County, California · implied b. ~1917 — 9 household members
| Surname | Byrne |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Daly City |
| 1935 Residence (County) | San Mateo |
| Occupation | Caddy |
| Industry | Golf course |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 624 |
| 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 James Byrne across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Byrne
Son · 1940 · age 23 · b. ~1917 · California
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Sibling
William Byrne
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Byrne
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Byrne
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Byrne
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Byrne
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Byrne
Sibling · 1940 · age 22
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-Mateo-County, California
Open full size
1940 US Federal Census — San-Mateo-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00329-00149)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Kenneth Foster | 35 | Head | Furnace | Utah |
| 42 | Rose Foster | 32 | Wife | — | Maryland |
| 43 | John Singer | 34 | Brother-in-law | Painter | Maryland |
| 44 | Earl Bradbury | 64 | Head | Painter | Denmark |
| 45 | Johanne Bradbury | 60 | Wife | — | Denmark |
| 46 | Lavena Barry | 74 | Head | — | Utah |
| 47 | Esther Lyman | 55 | Grandniece | Waitress | California |
| 48 | John Pitts | 71 | Head | — | Georgia |
| 49 | Elizabeth Vowel | 44 | Daughter | — | Kentucky |
| 50 | Lawrence Vowel | 20 | Grandson | Machinist | Illinois |
| 51 | John Sr. Mossman | 39 | Head | Clerk | Minnesota |
| 52 | Arthur Hoar | 66 | Father-in-law | Watchman | Ohio |
| 53 | Florence Hoar | 62 | Mother-in-law | — | Minnesota |
| 54 | Evelyn Mossman | 36 | Wife | — | Minnesota |
| 55 | John Jr. Mossman | 13 | Son | — | California |
| 56 | Marilyn Mossman | 11 | Daughter | — | California |
| 57 | Harold Mossman | 7 | Son | — | California |
| 58 | Fred Hauptli | 61 | Head | Truck Driver | California |
| 59 | Hazel Hauptli | 48 | Wife | — | California |
| 60 | Joseph Lunghi | 30 | Head | Rancher | Italy |
| 61 | Jean Lunghi | 28 | Wife | Rancher | Canada |
| 62 | Maria Lunghi | 60 | Mother | Rancher | Italy |
| 63 | Geraldine Lunghi | 2 | Daughter | — | California |
| 64 | Christian Poddig | 53 | Head | Janitor | Germany |
| 65 | Wilhelmina Poddig | 49 | Wife | Janitor | Germany |
| 66 | Gertrude Poddig | 18 | Daughter | Clerk | Germany |
| 67 | Herbert Poddig | 16 | Son | — | California |
| 68 | Stephen Handie | 48 | Head | Oiler | Scotland |
| 69 | Bessie Handie | 49 | Wife | — | Scotland |
| 70 | Beatrice Handie | 20 | Daughter | Cutter | Scotland |
| 71 | Stephen Handie | 18 | Son | — | California |
| 72 | Robert Byrne | 51 | Head | Shipping Clerk | California |
| 73 | Elmer Byrne | 50 | Wife | — | California |
| 74 | Robert Byrne | 28 | Son | Laborer | California |
| 75 | James Byrne THIS PERSON | 23 | Son | Caddy | California |
| 76 | Thomas Byrne | 22 | Son | News Vender | California |
| 77 | Catherine Byrne | 20 | Daughter | Counter Girl | California |
| 78 | George Byrne | 18 | Son | — | California |
| 79 | William Byrne | 16 | Son | — | California |
| 80 | Irene Byrne | 15 | Daughter | — | California |
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)