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John Blackburn — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Alameda, California
Our Model Tree links this John Blackburn across the 1910, 1920 and 1930 US Censuses in Alameda, California (XGBoost, ~Confirmed) — first a head (b.~1881), then head of a 6-person household.
Age 49
b. ~1881
Male
Head
Born: Louisiana
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Alameda, California |
| Surname | Blackburn |
| Given Name | John C |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Louisiana |
| Age at First Marriage | 24 |
| Father's Birthplace | Louisiana |
| Mother's Birthplace | United States |
| Additional Details | |
| Occupation | Porter |
| Industry | R.R. Station |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 2500 |
| Radio Set | R |
| Veteran | No |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
| Occupation | Porter |
| Township / Ward | Oakland City Part |
| Est. Birth Year | ~1881 |
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.
6 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Florence Blackburn | Spouse | — | 47 | ~1883 |
| Maxine Blackburn | Other | — | 21 | ~1909 |
| Gretchen Blackburn | Other | — | 16 | ~1914 |
| John Blackburn | Head | — | 49 | ~1881 |
| Sydney Blackburn | Son | — | 18 | ~1912 |
| Roy Blackburn | Son | — | 18 | ~1912 |
Census Appearances
1910
Alameda, California
Head, age 31
Alameda, California · implied b. ~1879 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackburn |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Louisiana |
| Years Married | 6 |
| Father's Birthplace | Louisiana |
| Mother's Birthplace | Louisiana |
| Occupation | Diner Porter |
| Industry | Rail Road |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
1920
Alameda, California
Head, age 41
Alameda, California · implied b. ~1879 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackburn |
| Given Name | John T. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Louisiana |
| Father's Birthplace | Louisiana |
| Mother's Birthplace | Louisiana |
| Occupation | Porter |
| Industry | Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
1930
Alameda, California
Head, age 49
Alameda, California · implied b. ~1881 — 6 household members
| Surname | Blackburn |
| Given Name | John C |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Louisiana |
| Age at First Marriage | 24 |
| Father's Birthplace | Louisiana |
| Mother's Birthplace | United States |
| Occupation | Porter |
| Industry | R.R. Station |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 2500 |
| Radio Set | R |
| Veteran | No |
| Birth State | Louisiana |
| Birth Country | United States |
| Birthplace (normalized) | louisiana |
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 Blackburn across 3 US Census years (1910, 1920 and 1930) in Alameda, California, using XGBoost record linkage.
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This person
Anchor record
John Blackburn
Head · 1930 · age 49 · b. ~1881 · California
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Alameda, California
Open full size
1930 US Federal Census — Alameda, California
Page Contents
50 people indexed on this census page (ia:1930:15thcensuspopula102unit:0044)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lucy A. Carlsen | 60 | Head | — | Iowa |
| 2 | Carl Adams | 54 | Boarder | Watchman | Maine |
| 3 | John C Blackburn THIS PERSON | 49 | Head | Porter | Louisiana |
| 4 | Florence E Blackburn | 47 | Wife | — | Louisiana |
| 5 | Maxine A Blackburn | 21 | Dau | — | California |
| 6 | Sydney A Blackburn | 18 | Son | — | California |
| 7 | Roy C Blackburn | 18 | Son | — | California |
| 8 | Gretchen A Blackburn | 16 | Dau | — | California |
| 9 | Ernest S Thomas | 32 | Head | Underwriter | Mississippi |
| 10 | Laura E Thomas | 70 | Mother | — | Mississippi |
| 11 | Camelia B Thomas | 21 | Sister-H | — | Mississippi |
| 12 | Mary E Smell | 50 | Sister | — | Mississippi |
| 13 | Milton W Lovett | 17 | Nephew | — | Mississippi |
| 14 | George E Lovett | 13 | Nephew | — | Mississippi |
| 15 | Elijah W Ab. Ford | 37 | Head | Cook | Louisiana |
| 16 | Cora E Ford | 60 | Mother-H | — | Louisiana |
| 17 | Robert L Martin | 24 | Boarder | Helper | Tennessee |
| 18 | Marie Martin | 23 | Boarder | Operator | Louisiana |
| 19 | Virginia La Madrid | 35 | Head | — | Spain |
| 20 | Albert La Madrid | 20 | Son | Shipper | California |
| 21 | Josephine La Madrid | 17 | Dau | — | California |
| 22 | Elvera La Madrid | 10 | Dau | — | California |
| 23 | Andrew Zales | 42 | Boarder | Carpenter | Pennsylvania |
| 24 | Everett Boyd | 36 | Boarder | Electrician | Mississippi |
| 25 | Daniel J Murphy | 44 | Head | Engineer | California |
| 26 | Mary Murphy | 70 | Mother-H | — | Irish Free State |
| 27 | Margaret Voile | 53 | Head-H | — | California |
| 28 | Charles R Voile | 23 | Son | Adjuster | California |
| 29 | Marie L A. Voile | 19 | Dau | — | California |
| 30 | Jeanette Voile | 16 | Dau | — | California |
| 31 | Abraham Mazurit | 53 | Head | Tailor | Poland |
| 32 | Gus Mazurit | 18 | Son | Asst Adjuster | Illinois |
| 33 | Cornelius J O'Grady | 65 | Head | Laborer | Irish Free State |
| 34 | Elizabeth O'Grady | 62 | Wife-H | — | England |
| 35 | Charles R Weidlich | 25 | Head | Mechanic | Illinois |
| 36 | Mildred C Weidlich | 25 | Wife-H | — | California |
| 37 | Robert C Weidlich | 1 | Son | — | California |
| 38 | Martin O'Toole | 45 | Head | Cement Worker | Irish Free State |
| 39 | Norah O'Toole | 43 | Wife-H | — | Irish Free State |
| 40 | George O'Toole | 16 | Son | — | California |
| 41 | Mary O'Toole | 13 | Dau | — | California |
| 42 | Margaret O'Toole | 11 | Dau | — | California |
| 43 | Martin Jr O'Toole | 7 | Son | — | California |
| 44 | Edward O'Toole | 1 | Son | — | California |
| 45 | Norah Erwin | 71 | Mother-in-law | — | Irish Free State |
| 46 | Lawrence H Fisher | 34 | Head | Tie Loader | Texas |
| 47 | Christina Fisher | 33 | Wife-H | — | Texas |
| 48 | Minneola Fisher | 18 | Dau | — | Texas |
| 49 | Kenneth Fisher | 17 | Son | — | Texas |
| 50 | Jack Fisher | 15 | Son | — | Louisiana |
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)