WJ
William Jensen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this William Jensen across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 10-person household.
Age 16
b. ~1924
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Jensen |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1924 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Richard Jensen | Son | — | 2 | ~1938 |
| Paul Jensen | Son | — | 6 | ~1934 |
| William Jensen | Son | — | 16 | ~1924 |
| John Jensen | Son | — | 10 | ~1930 |
| Helen Jensen | Daughter | — | 19 | ~1921 |
| Robert Jensen | Son | — | 14 | ~1926 |
| Alfred Jensen | Son | — | 21 | ~1919 |
| Ellen Jensen | Spouse | — | 41 | ~1899 |
| Alfred Jensen | Head | — | 51 | ~1889 |
| Harold Jensen | Son | — | 4 | ~1936 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 6
Suffolk, Massachusetts · implied b. ~1924 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | William H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Norway |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 16
Suffolk-County, Massachusetts · implied b. ~1924 — 10 household members
| Surname | Jensen |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Jensen across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Jensen
Son · 1940 · age 16 · b. ~1924 · Massachusetts
★ You are viewing this record
Sibling
Robert Jensen
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Jensen
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alfred Jensen
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Jensen
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Jensen
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Jensen
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Jensen
Sibling · 1940 · age 4
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01670-00316)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ann Muir | 19 | Daughter | Attendant | Massachusetts |
| 2 | Alice Muir | 18 | Daughter | Attendant | Massachusetts |
| 3 | Agnes M. Thomas | 49 | Head | — | Ireland |
| 4 | William Thomas | 19 | Son | Office Clerk | Massachusetts |
| 5 | Donald Thomas | 17 | Son | — | Massachusetts |
| 6 | Maurice Thomas | 15 | Son | — | Massachusetts |
| 7 | Isabelle Thomas | 14 | Daughter | — | Massachusetts |
| 8 | Annie Thomas | 11 | Daughter | — | Massachusetts |
| 9 | James D. Slater | 24 | Head | Cleaner | Massachusetts |
| 10 | Margaret Slater | 19 | Wife | — | Canada-Eng |
| 11 | Harry J. Prask | 34 | Head | Chauffeur | Massachusetts |
| 12 | Bertha M. Prask | 35 | Wife | — | Canada-Eng |
| 13 | Edith Prask | 4 | Daughter | — | Massachusetts |
| 14 | Harry Prask | 1 | Son | — | Massachusetts |
| 15 | Charlotte Prask | 6 | Daughter | — | Massachusetts |
| 16 | Charlotte Prask | 63 | Mother | — | Massachusetts |
| 17 | Alfred Prask | 30 | Brother | Operator | Massachusetts |
| 18 | Alfred Jensen | 51 | Head | Electrician | Massachusetts |
| 19 | Ellen G. (R) Jensen | 41 | Wife | — | Massachusetts |
| 20 | Alfred J. Jensen | 21 | Son | Elevator Boy | Massachusetts |
| 21 | Helen C. Jensen | 19 | Daughter | New Worker | Massachusetts |
| 22 | William J. Jensen THIS PERSON | 16 | Son | — | Massachusetts |
| 23 | Robert J. Jensen | 14 | Son | — | Massachusetts |
| 24 | John C. Jensen | 10 | Son | — | Massachusetts |
| 25 | Paul Jensen | 6 | Son | — | Massachusetts |
| 26 | Harold A. Jensen | 4 | Son | — | Massachusetts |
| 27 | Richard P. Jensen | 2 | Son | — | Massachusetts |
| 28 | Charlotte Black | 38 | Head | — | Massachusetts |
| 29 | Frank Black | 6 | Son | — | Massachusetts |
| 30 | Russell Black | 5 | Son | — | Massachusetts |
| 31 | Charles Deviny | 47 | Head | Janitor | Florida |
| 32 | Henrietta Deviny | 44 | Wife | — | Massachusetts |
| 33 | Frances Deviny | 22 | Daughter | New Worker | Massachusetts |
| 34 | Geraldine Deviny | 20 | Daughter | New Worker | Massachusetts |
| 35 | Lewis Sears | 42 | Head | Linen Man | Virginia |
| 36 | Pearl (R) Sears | 40 | Wife | — | Virginia |
| 37 | Gloria Sears | 10 | Daughter | — | New York |
| 38 | Joseph Mcsweeney | 52 | Lodger | Waiter | West Indies |
| 39 | Leslie Lewis | 30 | Lodger | Waitress | No. Carolina |
| 40 | Catherine Haggerty | 80 | Head | — | Irish Free State |
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)