JD
John Dugan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Marin, California
Our Model Tree links this John Dugan across the 1930 and 1940 US Censuses in Marin, California (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 9-person household.
Age 6
b. ~1924
Male
Son
Born: California
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Marin, California |
| Surname | Dugan |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Northern Ireland |
| Mother's Birthplace | Northern Ireland |
| Additional Details | |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Bolinas Township |
| Est. Birth Year | ~1924 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Dugan | Son | — | 6 | ~1924 |
| William Dugan | Head | — | 39 | ~1891 |
| Herbert Dugan | Son | — | 5 | ~1925 |
| William Dugan | Son | — | 1 | ~1929 |
| James Dugan | Son | — | 8 | ~1922 |
| Ethel Dugan | Daughter | — | 3 | ~1927 |
| Margaret Dugan | Spouse | — | 33 | ~1897 |
| Harold Dugan | Son | — | 5 | ~1925 |
| Robert Dugan | Son | — | 10 | ~1920 |
Census Appearances
1930
Marin, California
Son, age 6
Marin, California · implied b. ~1924 — 9 household members
| Surname | Dugan |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Northern Ireland |
| Mother's Birthplace | Northern Ireland |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Marin-County, California
Son, age 16
Marin-County, California · implied b. ~1924 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dougan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Geronimo |
| 1935 Residence (County) | Marin |
| Highest Grade | Hs 1 |
| 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 Dugan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Dugan
Son · 1930 · age 6 · b. ~1924 · California
★ You are viewing this record
Sibling
James Dugan
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Dugan
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Dugan
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ethel Dugan
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Dugan
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herbert Dugan
Sibling · 1930 · age 5
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 — Marin, California
Open full size
1930 US Federal Census — Marin, California
Page Contents
50 people indexed on this census page (ia:1930:californiacensus00reel177:0003)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles S. Blake | 55 | Head | — | California |
| 2 | Margaret Blake | 51 | Wife | — | Northern Ireland |
| 3 | William Dugan | 39 | Head | Farmer | Northern Ireland |
| 4 | Margaret N. Dugan | 33 | Wife | — | Northern Ireland |
| 5 | Robert Dugan | 10 | Son | — | California |
| 6 | James Dugan | 8 | Son | — | California |
| 7 | John A. Dugan THIS PERSON | 6 | Son | — | California |
| 8 | Harold Dugan | 5 | Son | — | California |
| 9 | Herbert Dugan | 5 | Son | — | California |
| 10 | Ethel G. Dugan | 3 | Daughter | — | California |
| 11 | William Jr. Dugan | 1 | Son | — | California |
| 12 | Arthur J. Healion | 44 | Head | Farmer | California |
| 13 | Caroline J. Healion | 52 | Wife | — | California |
| 14 | Norman A. Healion | 15 | Son | Laborer | California |
| 15 | Irene E. Healion | 11 | Daughter | — | California |
| 16 | William F. Healion | 63 | Brother | Laborer | California |
| 17 | John Alley | 47 | Head | Farmer | Afghanistan |
| 18 | Gertrude N. Alley | 44 | Wife | — | Minnesota |
| 19 | Willey Gilbert Alley | 14 | Boarder | — | Utah |
| 20 | June Alley | 9 | Boarder | — | Colorado |
| 21 | Anton Stallard | 27 | Lodger | Laborer | Norway |
| 22 | Alexander Mccreery | 72 | Lodger | Laborer | Northern Ireland |
| 23 | Joseph F. Teixeira | 47 | Head | Farmer | Portugal |
| 24 | Mary M. Teixeira | 30 | Wife | — | Portugal |
| 25 | Christina M. Teixeira | 9 | Daughter | — | California |
| 26 | Antone J. Teixeira | 8 | Son | — | California |
| 27 | Mary M. Teixeira | 7 | Daughter | — | California |
| 28 | Joseph F. Jr. Teixeira | 5 | Son | — | California |
| 29 | Irene M. Teixeira | 4 | Daughter | — | California |
| 30 | William F. Teixeira | 1 | Son | — | California |
| 31 | Albert Nicca | 20 | Lodger | Laborer | Switzerland |
| 32 | Ella M. Strain | 61 | Head-H | — | Northern Ireland |
| 33 | Peter E. Bourne | 54 | Head | Farmer | California |
| 34 | James Nesbitt | 35 | Son in law | Laborer | Northern Ireland |
| 35 | Bertha M. Nesbitt | 25 | Daughter | — | California |
| 36 | Ethel A. Johnson | 26 | Daughter | Housekeeper | California |
| 37 | Gentile Giannini | 44 | Head-H | — | Switzerland |
| 38 | Zelma J. Giannini | 17 | Daughter | — | California |
| 39 | Frederick W. Giannini | 14 | Son | — | California |
| 40 | Genevieve Giannini | 12 | Daughter | — | California |
| 41 | Sylvia Giannini | 11 | Daughter | — | California |
| 42 | Alice Giannini | 9 | Daughter | — | California |
| 43 | Joseph Giannini | 8 | Son | — | California |
| 44 | Charles Giannini | 6 | Son | — | California |
| 45 | Walter Regoli | 33 | Boarder | Laborer | Switzerland |
| 46 | Henry S. Cramer | 57 | Head | Carpenter | California |
| 47 | Zelda A. Cramer | 45 | Wife | — | California |
| 48 | James Cramer | 53 | Brother | Carpenter | California |
| 49 | Joseph Mendoza | 74 | Head | Laborer | Portugal |
| 50 | Frank Briones | 51 | Head | Laborer | California |
Related Census Records
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)