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Jean Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Mateo-County, California
Our Model Tree links this Jean Johnson across the 1930 and 1940 US Censuses in San-Mateo-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 6-person household.
Age 15
b. ~1925
Female
Daughter
Born: Idaho
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Mateo-County, California |
| Surname | Johnson |
| Given Name | Jean |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Idaho |
| 1935 Residence (City) | Daly City |
| 1935 Residence (County) | San Mateo |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-1 |
| 1935 Residence | California |
| Birth State | Idaho |
| Birth Country | United States |
| Birthplace (normalized) | idaho |
| Township / Ward | San Bruno |
| Est. Birth Year | ~1925 |
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 1940 census.
| Name | Relation to head | Relative to Jean | Age | Birth yr |
|---|---|---|---|---|
| Robert Johnson | Son | — | 8 | ~1932 |
| Florine Johnson | Daughter | — | 19 | ~1921 |
| Jean Johnson | Daughter | — | 15 | ~1925 |
| Emma Johnson | Spouse | — | 39 | ~1901 |
| Margie Johnson | Daughter | — | 18 | ~1922 |
| Albert Johnson | Head | — | 41 | ~1899 |
Census Appearances
1930
San Mateo, …
Daughter, age 5
San Mateo, California · implied b. ~1925 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Jean E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Idaho |
| Father's Birthplace | Idaho |
| Mother's Birthplace | Montana |
| Can Read/Write | Yes |
| Birth State | Idaho |
| Birth Country | United States |
| Birthplace (normalized) | idaho |
1940
San-Mateo-County, California
Daughter, age 15
San-Mateo-County, California · implied b. ~1925 — 6 household members
| Surname | Johnson |
| Given Name | Jean |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Idaho |
| 1935 Residence (City) | Daly City |
| 1935 Residence (County) | San Mateo |
| Income (1939) | 0 |
| Highest Grade | H-1 |
| 1935 Residence | California |
| Birth State | Idaho |
| Birth Country | United States |
| Birthplace (normalized) | idaho |
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 Jean Johnson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jean Johnson
Daughter · 1940 · age 15 · b. ~1925 · California
★ You are viewing this record
Sibling
Florine Johnson
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margie Johnson
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Johnson
Sibling · 1940 · age 8
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-t0627-00329-00365)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph Krosig | 39 | Head | Merchant | Nevada |
| 2 | Leda Krosig | 39 | Wife | — | California |
| 3 | Percy Kaduke | 40 | Head | Auto Mechanic | Washington |
| 4 | June Kaduke | 47 | Wife | — | California |
| 5 | Henry Trearman | 37 | Head | Baker | Germany |
| 6 | Catherine Trearman | 31 | Wife | — | Germany |
| 7 | Anna Trearman | 9 | Daughter | — | California |
| 8 | Henry Trearman | 8 | Son | — | California |
| 9 | Bernard Trearman | 2 | Son | — | California |
| 10 | Albert Johnson | 41 | Head | Butcher | Idaho |
| 11 | Emma Johnson | 39 | Wife | — | Montana |
| 12 | Florine Johnson | 19 | Daughter | — | Idaho |
| 13 | Margie Johnson | 18 | Daughter | — | Idaho |
| 14 | Jean Johnson THIS PERSON | 15 | Daughter | — | Idaho |
| 15 | Robert Johnson | 8 | Son | — | California |
| 16 | Joseph Firpo | 47 | Head | Pea Grower | Italy |
| 17 | Josephine Firpo | 47 | Wife | — | Italy |
| 18 | John Firpo | 15 | Son | — | California |
| 19 | Ried Firpo | 11 | Son | — | California |
| 20 | Arthur Frazier | 46 | Head | Salesman | Iowa |
| 21 | Nellie Frazier | 46 | Wife | — | Oklahoma |
| 22 | George Walden | 47 | Head | Carpenter | Missouri |
| 23 | Mabel Walden | 50 | Wife | — | Oregon |
| 24 | Victor Gschwend | 32 | Head | Checker | Switzerland |
| 25 | Catherine Gschwend | 20 | Wife | — | Illinois |
| 26 | Warren Boyd | 26 | Head | Roofer | California |
| 27 | Elizabeth Boyd | 20 | Wife | — | California |
| 28 | Joan Boyd | 1 | Daughter | — | California |
| 29 | William Welslauer | 28 | Head | Salesman | New Jersey |
| 30 | Sophie Welslauer | 25 | Wife | — | New Jersey |
| 31 | William Welslauer | 3 | Son | — | California |
| 32 | Robert Goldsbury | 39 | Head | Misc Salesman | Nebraska |
| 33 | Ellen Goldsbury | 39 | Wife | Office | Illinois |
| 34 | Leo Rello | 30 | Head | Checker | West Virginia |
| 35 | Florence Rello | 28 | Wife | Stenographer | Oregon |
| 36 | Janet Rello | 5 | Daughter | — | Washington D.C. |
| 37 | Mary Boettrick | 64 | Mother-in-law | — | Nebraska |
| 38 | — | None | — | — | — |
| 39 | William Bundy | 48 | Head | Odd Jobs | Kentucky |
| 40 | Beatrice Bundy | 54 | Wife | Real Estate | Ohio |
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)