JN
John Nash — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Diego-County, California
Our Model Tree links this John Nash across the 1930 and 1940 US Censuses in San-Diego-County, California (XGBoost, ~Confirmed) — first a son (b.~1919), then head of a 11-person household.
Age 21
b. ~1919
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Diego-County, California |
| Surname | Nash |
| Given Name | John F. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | San Diego City |
| 1935 Residence (County) | San Diego |
| Additional Details | |
| Occupation | surveyor |
| Industry | Soil Conservation |
| Class of Worker | GW |
| Hours Worked | 80 |
| Income (1939) | 400 |
| Highest Grade | C-2 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Surveyor |
| Township / Ward | San Diego City |
| Est. Birth Year | ~1919 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Elizabeth Brentwood | Daughter | — | 19 | ~1921 |
| John Nash | Son | — | 21 | ~1919 |
| Martha Nash | Daughter | — | 20 | ~1920 |
| Grace Nash | Spouse | — | 45 | ~1895 |
| Lowell Nash | Son | — | 4 | ~1936 |
| Mary Nash | Daughter | — | 11 | ~1929 |
| John Nash | Head | — | 49 | ~1891 |
| John Brentwood | Other | — | ~1940 | |
| Thomas Nash | Son | — | 15 | ~1925 |
| Robert Brentwood | Other | — | 20 | ~1920 |
| Myrtle Nash | Daughter | — | 14 | ~1926 |
Census Appearances
1930
San Diego, …
Son, age 11
San Diego, California · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nash |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Montana |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
San-Diego-County, California
Son, age 21
San-Diego-County, California · implied b. ~1919 — 11 household members
| Surname | Nash |
| Given Name | John F. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | San Diego City |
| 1935 Residence (County) | San Diego |
| Occupation | surveyor |
| Industry | Soil Conservation |
| Class of Worker | GW |
| Hours Worked | 80 |
| Income (1939) | 400 |
| Highest Grade | C-2 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Nash across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Nash
Son · 1940 · age 21 · b. ~1919 · California
★ You are viewing this record
Sibling
Martha Nash
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Nash
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Nash
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Myrtle Nash
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lowell Nash
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Brentwood
Sibling · 1940 · age 19
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-Diego-County, California
Open full size
1940 US Federal Census — San-Diego-County, California
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-00452-00990)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Howard L. Walker | 60 | Head | Customs Clerk | Massachusetts |
| 2 | Katherine A. Walker | 51 | Wife | — | Iowa |
| 3 | Howard L. Jr. Walker | 23 | Son | Customs Clerk | Oregon |
| 4 | John Czarmouski | 45 | Head | Machinist | Minnesota |
| 5 | Margaret Czarmouski | 44 | Wife | — | Kentucky |
| 6 | Frank D. Marco | 31 | Head | Metalsmith | Michigan |
| 7 | Marie Marco | 26 | Wife | — | California |
| 8 | Francine M. Marco | 1 | Daughter | — | California |
| 9 | Arthur R. Tibbitt | 37 | Head | Salesman | Colorado |
| 10 | Edna Tibbitt | 35 | Wife | — | Utah |
| 11 | Joyce M. Tibbitt | 16 | Daughter | — | California |
| 12 | Arthur R. Tibbitt | 12 | Son | — | California |
| 13 | Barbara Joan Tibbitt | 2 | Daughter | — | California |
| 15 | Orange G. Gregory | 62 | Head | Carpenter | Illinois |
| 16 | Maly B. Gregory | 46 | Wife | — | Missouri |
| 17 | John F. Nash | 49 | Head | Proprietor | Iowa |
| 18 | Grace D. Nash | 45 | Wife | — | Montana |
| 19 | John F. Jr. Nash THIS PERSON | 21 | Son | Surveyor | Iowa |
| 20 | Martha Nash | 20 | Daughter | Typist | Iowa |
| 21 | Thomas N. Nash | 15 | Son | — | Iowa |
| 22 | Myrtle L. Nash | 14 | Daughter | — | Iowa |
| 23 | Mary Nash | 11 | Daughter | — | California |
| 24 | Lowell Webster Nash | 4 | Son | — | California |
| 25 | Robert M. Brentwood | 20 | Son-in-law | Pharmacist | North Carolina |
| 26 | Elizabeth Anne Brentwood | 19 | Daughter | — | Iowa |
| 27 | John Marlin Brentwood | 0 | Granddaughter | — | California |
| 29 | Grace Louise Stuart | 60 | Head | — | California |
| 30 | Henry F. Ulrich | 37 | Head | Salesman | South Dakota |
| 31 | Pearl M. Ulrich | 37 | Wife | — | Minnesota |
| 32 | Henry F. Jr. Ulrich | 10 | Son | — | Ohio |
| 33 | Charles D. Ulrich | 4 | Son | — | Minnesota |
| 34 | Floyd Davidson | 44 | Head | Proprietor | Wisconsin |
| 35 | Lily Davidson | 34 | Wife | — | Idaho |
| 36 | Roger Davidson | 9 | Son | — | Idaho |
| 37 | Beverly Davidson | 6 | Daughter | — | Idaho |
| 38 | Richard Updegraff | 37 | Head | Contractor | California |
| 39 | Violet Updegraff | 29 | Wife | — | Nebraska |
| 40 | Sharron Lee Updegraff | 3 | Daughter | — | California |
Related Census Records
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)