JG
John Griffin — 1930 US Census Record
Model Tree available1930 United States Federal Census · San Francisco, California
Our Model Tree links this John Griffin across the 1910, 1920, 1930 and 1940 US Censuses in San Francisco, California (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1908), then head of a 7-person household.
Age 22
b. ~1908
Male
Son
Born: California
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | San Francisco, California |
| Surname | Griffin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Salesman |
| Industry | Retail Clothing |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Salesman |
| Township / Ward | San Francisco City |
| 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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Griffin | Daughter | — | 21 | ~1909 |
| John Griffin | Head | — | 56 | ~1874 |
| Thomas Griffin | Son | — | 15 | ~1915 |
| George Griffin | Son | — | 13 | ~1917 |
| John Griffin | Son | — | 22 | ~1908 |
| James Griffin | Son | — | 23 | ~1907 |
| Alice Griffin | Spouse | — | 56 | ~1874 |
Census Appearances
1910
San Francisco, …
Son, age 3
San Francisco, California · implied b. ~1907 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1920
San Francisco, …
Son, age 12
San Francisco, California · implied b. ~1908 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffin |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| 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 — 7 household members
| Surname | Griffin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Salesman |
| Industry | Retail Clothing |
| Class of Worker | W |
| 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 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffone |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | S. F. |
| Occupation | Shipping Clerk |
| Industry | Fruit |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1120 |
| 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 John Griffin across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Griffin (~0.92 confidence) and father John Griffin (~0.92 confidence) and mother Alice Griffin (~0.92 confidence) and father John Griffin (~0.92 confidence) and mother Julia Griffin (~0.92 confidence) and mother Julia Griffin (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Griffin
b. ~1871
Source father
● Household
· direct · ~0.92
Father
John Griffin
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Alice Griffin
b. ~1874
Source mother
● Household
· direct · ~0.92
Father
John Griffin
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Julia Griffin
b. ~1879
Source mother
● Household
· direct · ~0.92
Mother
Julia Griffin
b. ~1882
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Griffin
Son · 1930 · age 22 · b. ~1908 · California
★ You are viewing this record
Sibling
James Griffin
Sibling · 1930 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Griffin
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Griffin
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Griffin
Sibling · 1930 · age 21
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
1930 US Federal Census — San Francisco, California
Open full size
1930 US Federal Census — San Francisco, California
Page Contents
47 people indexed on this census page (ia:1930:californiacensus00reel198:0912)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Patrick Rooney | 55 | Head | Civil Work | Unknown |
| 2 | Annie Rooney | 54 | Wife | Clerical Work | New York |
| 3 | Lucy Price | 71 | Boarder | Housekeeper | Massachusetts |
| 4 | Richard Darsey | 56 | Head | Musician | Germany |
| 5 | Katherine Darsey | 52 | Wife | None | France |
| 6 | Alice Harrigan | 27 | Daughter | Telegrapher | California |
| 7 | Marie Marie | 59 | Head | None | California |
| 8 | Howard Marie | 32 | Son | Newspaper Chauffeur | California |
| 9 | William Marie | 30 | Son | Salesman | California |
| 10 | William P. Doyle | 38 | Head | Machinist | California |
| 11 | Cecelia Doyle | 36 | Wife | — | California |
| 12 | William Doyle | 13 | Son | — | California |
| 13 | Edward Doyle | 11 | Son | — | California |
| 14 | Caroline Parton | 59 | Head | None | Germany |
| 15 | Chris Bare | 35 | Son | Motorman | California |
| 16 | Margaret Kelly | 58 | Head | None | England |
| 17 | Margaret Finney | 28 | Niece | Trained Nurse | New York |
| 18 | Amintore Annunziato | 42 | Head | Laborer | Italy |
| 19 | Antonia Annunziato | 41 | Wife | None | Italy |
| 20 | Luigi Annunziato | 13 | Son | — | Italy |
| 22 | John Ferraris | 37 | Head | Laborer | Italy |
| 23 | Guilia Ferraris | 37 | Wife | Seamstress | Italy |
| 24 | Lou Ferraris | 9 | Son | — | Italy |
| 25 | Albertina Ferraris | 8 | Daughter | — | California |
| 26 | Mally Quade | 64 | Mother-in-law | None | Italy |
| 27 | Nicholas Wimes | 55 | Head | Iron Worker | Minnesota |
| 28 | Clara Wimes | 55 | Wife | None | California |
| 29 | Donalda Wimes | 23 | Daughter | Milliner | California |
| 30 | Naomi Wimes | 17 | Daughter | — | California |
| 31 | Josephine Parr | 62 | Sister-in-law | None | California |
| 32 | Jesse H. Kim | 32 | Head | Meat Cutter | Louisiana |
| 33 | Lucy H. Kim | 28 | Wife | None | California |
| 34 | Sarah J. Kim | 1 | Son | None | California |
| 35 | Louis Pestono | 40 | Head | Foreman | Italy |
| 36 | Pestono | 34 | Wife | Presser | Italy |
| 37 | Thomas Pirotte | 30 | Cousin | None | Italy |
| 38 | John Griffin | 56 | Head | Laborer | Irish Free State |
| 39 | Alice Griffin | 56 | Wife | — | Irish Free State |
| 40 | James B. Griffin | 23 | Son | Bookkeeper | California |
| 41 | John Griffin THIS PERSON | 22 | Son | Salesman | California |
| 42 | Mary C. Griffin | 21 | Daughter | Stenographer | California |
| 43 | Thomas R. Griffin | 15 | Son | — | California |
| 44 | George M. Griffin | 13 | Son | — | Irish Free State |
| 45 | William Winn | 57 | Head | Real Estate | California |
| 46 | Winn | 47 | Wife | None | Germany |
| 47 | Joseph Ditto | 15 | Step-son | None | California |
| 48 | Clarence M. Olsen | 31 | Head | Stenographer | Washington |
Related Census Records
Pedigree Summary
John + 4 siblings
Gen 1 · 6 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)