WK
William Kerr — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Mateo-County, California
Our Model Tree links this William Kerr across the 1930 and 1940 US Censuses in San-Mateo-County, California (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 8-person household.
Age 20
b. ~1920
Male
Son
Born: Washington
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Mateo-County, California |
| Surname | Kerr |
| Given Name | William J. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | San Mateo City |
| 1935 Residence (County) | San Mateo |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | C 3 |
| 1935 Residence | Same Place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Township / Ward | San Mateo City |
| Est. Birth Year | ~1920 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Kerr | Head | — | 50 | ~1890 |
| Father Burdette | Other | — | — | |
| William Kerr | Son | — | 20 | ~1920 |
| Dorothy Kerr | Daughter | — | 17 | ~1923 |
| Mary Smith | Other | — | 59 | ~1881 |
| Farnham Kerr | Son | — | 14 | ~1926 |
| Dorothy Kerr | Spouse | — | 50 | ~1890 |
| Marjorie Kerr | Daughter | — | 18 | ~1922 |
Census Appearances
1930
San Mateo, …
Son, age 10
San Mateo, California · implied b. ~1920 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kerr |
| Given Name | William J Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
San-Mateo-County, California
Son, age 20
San-Mateo-County, California · implied b. ~1920 — 8 household members
| Surname | Kerr |
| Given Name | William J. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | San Mateo City |
| 1935 Residence (County) | San Mateo |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | C 3 |
| 1935 Residence | Same Place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
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 William Kerr across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Kerr
Son · 1940 · age 20 · b. ~1920 · California
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Sibling
Marjorie Kerr
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Kerr
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Farnham Kerr
Sibling · 1940 · age 14
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-t0627-00330-00320)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Herbert A. Magnuson | 42 | Head | General Manager | Washington |
| 2 | Doris K. Magnuson | 39 | Wife | — | Washington |
| 3 | Herbert A. Jr. Magnuson | 12 | Son | — | California |
| 4 | Richard A. Magnuson | 5 | Son | — | California |
| 5 | Esther M. Kurtz | 20 | Maid | Maid | Nebraska |
| 6 | Conrad A. Beck | 73 | Head | — | Pennsylvania |
| 7 | Bertha Beck | 72 | Wife | — | Switzerland |
| 8 | Carmen Mcconnell | 43 | Daughter | Salesclerk | New York |
| 9 | Frank Mcconnell | 15 | Grandson | — | New York |
| 10 | Anna J. Tikkanen | 50 | Head | Maid | Finland |
| 11 | Jung Wah | 27 | Cook | Cook | California |
| 12 | Franklin C. Wheeler | 46 | Head | Advertising Manager | Illinois |
| 13 | Alice T. Wheeler | 35 | Wife | — | Illinois |
| 14 | Constance Wheeler | 14 | Daughter | — | Illinois |
| 15 | Franklin C. Jr. Wheeler | 10 | Son | — | Illinois |
| 16 | Martha J. Wheeler | 3 | Daughter | — | California |
| 17 | Leonard J. Griffiths | 76 | Father | — | England |
| 18 | Mayme Bleu | 34 | Maid | Maid | Missouri |
| 19 | George Wrangin | 73 | Head | — | Yugoslavia |
| 20 | Bertha Wrangin | 67 | Wife | — | California |
| 21 | Marguerite V. Edwards | 45 | Daughter | — | California |
| 22 | Marilyn M. Edwards | 17 | Granddaughter | — | California |
| 23 | Agnes Sittel | 20 | Maid | Maid | California |
| 24 | William J. Kerr | 50 | Head | Physician | Iowa |
| 25 | Dorothy E. Kerr | 50 | Wife | — | Pennsylvania |
| 26 | William J. Jr. Kerr THIS PERSON | 20 | Son | — | Washington |
| 27 | Marjorie S. A. Kerr | 18 | Daughter | — | California |
| 28 | Dorothy E. Kerr | 17 | Daughter | — | California |
| 29 | Farnham W. Kerr | 14 | Son | — | California |
| 30 | Father Burdette | None | M | Farm | — |
| 31 | Mary G. Smith | 59 | Maid | Maid | Scotland |
| 32 | William C. Evans | 50 | Head | Grain Broker | Nebraska |
| 33 | Della B. Evans | 45 | Wife | — | Colorado |
| 34 | Mary J. Evans | 16 | Daughter | — | California |
| 35 | Margaret T. Evans | 15 | Daughter | — | California |
| 36 | Charles K. Melrose | 68 | Head | Executive | New Jersey |
| 37 | Dora Melrose | 67 | Wife | — | California |
| 38 | Helen Melrose | 35 | Daughter | — | California |
| 39 | Lydia Salmi | 48 | Maid | Maid | Finland |
| 40 | Sidney Lee | 33 | Head | Apartment House Manager | California |
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)