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Joseph Costa — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Mateo-County, California
Our Model Tree links this Joseph Costa across the 1910, 1920, 1930 and 1940 US Censuses in San-Mateo-County, California (XGBoost, ~Confirmed) — first a head (b.~1870), then head of a 2-person household.
Age 70
b. ~1870
Male
Head
Born: Portugal
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Mateo-County, California |
| Surname | Costa |
| Given Name | Joseph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 70 |
| Marital Status | Widowed |
| Birthplace | Portugal |
| 1935 Residence (City) | San Mateo City |
| 1935 Residence (County) | San Mateo |
| Naturalization Status | Alien |
| Additional Details | |
| Occupation | Gardner |
| Class of Worker | OA |
| Income (1939) | 0 |
| Highest Grade | 5 |
| 1935 Residence | Same place |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
| Occupation | Gardner |
| Township / Ward | San Mateo City |
| Est. Birth Year | ~1870 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Joseph | Age | Birth yr |
|---|---|---|---|---|
| Toney Costa | Son | — | 23 | ~1917 |
| Joseph Costa | Head | — | 70 | ~1870 |
Census Appearances
1910
Alameda, California
Head, age 40
Alameda, California · implied b. ~1870 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costa |
| Given Name | Joe |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Portugal |
| Years Married | 3 |
| Year of Immigration | 1890 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Portugal |
| Mother's Birthplace | Portugal |
| Occupation | Farmer |
| Industry | General Farm |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
1920
Alameda, California
Head, age 50
Alameda, California · implied b. ~1870 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costa |
| Given Name | Joe |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Portugal |
| Year of Immigration | 1883 |
| Naturalization Status | Alien |
| Father's Birthplace | Portugal |
| Mother's Birthplace | Portugal |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Portuguese |
| Home Owned/Rented | R |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
1930
San Mateo, …
Head, age 60
San Mateo, California · implied b. ~1870 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costa |
| Given Name | Joe |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Portugal |
| Naturalization Status | Naturalized |
| Year of Immigration | 1897 |
| Age at First Marriage | 30 |
| Father's Birthplace | Portugal |
| Mother's Birthplace | Portugal |
| Occupation | Gardener |
| Industry | Odd Jobs |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Portuguese |
| Home Owned/Rented | O |
| Home Value / Rent | 3000 |
| Veteran | No |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
1940
San-Mateo-County, California
Head, age 70
San-Mateo-County, California · implied b. ~1870 — 2 household members
| Surname | Costa |
| Given Name | Joseph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 70 |
| Marital Status | Widowed |
| Birthplace | Portugal |
| 1935 Residence (City) | San Mateo City |
| 1935 Residence (County) | San Mateo |
| Naturalization Status | Alien |
| Occupation | Gardner |
| Class of Worker | OA |
| Income (1939) | 0 |
| Highest Grade | 5 |
| 1935 Residence | Same place |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
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 Joseph Costa across 4 US Census years (1910, 1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Joseph Costa
Head · 1940 · age 70 · b. ~1870 · California
★ You are viewing this record
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-t0627-00330-00241)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | George E Allen | 12 | Son | — | California |
| 42 | James M Allen | 39 | Head | Baker | Wyoming |
| 43 | Margaret Allen | 39 | Wife | — | Colorado |
| 44 | James Jr. Allen | 14 | Son | — | Colorado |
| 45 | Gene Allen | 13 | Son | — | Colorado |
| 46 | Louis Allen | 10 | Son | — | California |
| 47 | Yvonne Allen | 6 | Daughter | — | California |
| 48 | Glen Allen | 28 | Brother | Baker'S Helper | Colorado |
| 49 | John Ribeiro | 36 | Head | Laborer | Portugal |
| 50 | Margaret Ribeiro | 32 | Wife | House Work | Portugal |
| 51 | Alice M. Ribeiro | 12 | Daughter | — | California |
| 52 | Fred L. Ribeiro | 11 | Son | — | California |
| 53 | Joseph Costa THIS PERSON | 70 | Head | Gardner | Portugal |
| 54 | Toney Costa | 23 | Son | Truck Driver | California |
| 55 | Mary Carli | 50 | Head | — | Italy |
| 56 | John Carli | 70 | Husband | — | Italy |
| 57 | Lena Carli | 31 | Daughter | — | Italy |
| 58 | Angelo Brieda | 37 | Son-in-law | Gardner | Italy |
| 59 | Rose Brieda | 29 | Daughter | — | Alaska |
| 60 | Catherine Brieda | 9 | Granddaughter | — | California |
| 61 | Victor Turchet | 35 | Head | Truck Driver | Italy |
| 62 | Alice Turchet | 30 | Wife | — | California |
| 63 | Joanne Turchet | 2 | Daughter | — | California |
| 64 | Arthur Carli | 26 | Son | Printer | Alaska |
| 65 | James Cant | 57 | Head | Gardner | Scotland |
| 66 | Louilla F. Cant | 56 | Wife | Cook | Scotland |
| 67 | Flora Cant | 17 | Daughter | — | California |
| 68 | Isabelle Cant | 16 | Daughter | — | California |
| 69 | Carl H. Carlson | 47 | Head | Plasterer | Sweden |
| 70 | Elsie T. Carlson | 34 | Wife | — | Sweden |
| 71 | Jack N. Carlson | 13 | Son | — | California |
| 72 | William De Giovani | 24 | Head | Milk Driver | California |
| 73 | Lillian L. De Giovani | 25 | Wife | — | Wisconsin |
| 74 | Beverly A. De Giovani | 6 | Daughter | — | California |
| 75 | Sharon L. De Giovani | 2 | Daughter | — | California |
| 76 | Carol M. De Giovani | 0 | Daughter | — | California |
| 77 | Louis J. Szapkay | 52 | Head | Plumber | California |
| 78 | Attilia L. Szapkay | 52 | Wife | — | California |
| 79 | Joseph C. Szapkay | 25 | Son | Sheet Metal Worker | California |
| 80 | Alex Schneider | 76 | Father-in-law | — | Germany |
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)