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.~1921), then head of a 8-person household.
Age 19
b. ~1921
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Jensen |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | New Worker |
| Income (1939) | 0 |
| Highest Grade | No 9 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | New Worker |
| Township / Ward | Boston |
| Est. Birth Year | ~1921 |
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 |
|---|---|---|---|---|
| Rose Jensen | Daughter | — | 12 | ~1928 |
| Frances Jensen | Daughter | — | 12 | ~1928 |
| William Jensen | Son | — | 19 | ~1921 |
| Esther Jensen | Daughter | — | 14 | ~1926 |
| William Jensen | Head | — | 50 | ~1890 |
| Barbara Jensen | Daughter | — | 10 | ~1930 |
| Maria Jensen | Spouse | — | 48 | ~1892 |
| Anne Jensen | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 9
Suffolk, Massachusetts · implied b. ~1921 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jenson |
| Given Name | William M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 19
Suffolk-County, Massachusetts · implied b. ~1921 — 8 household members
| Surname | Jensen |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | New Worker |
| Income (1939) | 0 |
| Highest Grade | No 9 |
| 1935 Residence | Same place |
| 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 19 · b. ~1921 · Massachusetts
★ You are viewing this record
Sibling
Rose Jensen
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Jensen
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Jensen
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anne Jensen
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Esther Jensen
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 — 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-t0627-01676-00232)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Clarissa Clark | 81 | Mother-in-law | — | Massachusetts |
| 2 | William Tobin | 34 | Head | Teacher | Massachusetts |
| 3 | Mary R. Tobin | 34 | Wife | — | Canada-English |
| 4 | William Tobin | 5 | Son | — | Massachusetts |
| 5 | Gladys Kozlowski | 22 | Servant | Servant | Massachusetts |
| 6 | Michael Manning | 30 | Head | Machine Operato | Massachusetts |
| 7 | Mary Manning | 31 | Sister | Supervisor | Massachusetts |
| 8 | Mary Driscoll | 24 | Lodger | Stenographer | Massachusetts |
| 9 | Herbert Campbell | 39 | Head | Electrician | Massachusetts |
| 10 | Mildred Campbell | 37 | Wife | — | Massachusetts |
| 11 | William Campbell | 11 | Son | — | Massachusetts |
| 12 | Carol Campbell | 4 | Daughter | — | Massachusetts |
| 13 | Judith Campbell | 1 | Daughter | — | Massachusetts |
| 14 | Ruth Miller | 46 | Sister-in-law | Seamstress | Massachusetts |
| 15 | Marilyn Miller | 16 | Niece | — | Massachusetts |
| 16 | Lawrence Carter | 41 | Head | Paper Ruler | Massachusetts |
| 17 | Lillian Carter | 40 | Wife | — | Massachusetts |
| 18 | Mary Ball | 65 | Mother-in-law | — | Canada-Eng |
| 19 | Joseph Ball | 32 | Brother-in-law | Salesman | Massachusetts |
| 20 | Lewis R. Matz | 52 | Head | Retailer Apparel | Lithuania |
| 21 | Sena Matz | 51 | Wife | — | Poland |
| 22 | Bertram Matz | 30 | Son | Attorney | Massachusetts |
| 23 | William Jensen | 50 | Head | Carpenter | Denmark |
| 24 | Maria R. Jensen | 48 | Wife | — | Massachusetts |
| 25 | Anne Jensen | 20 | Daughter | File Clerk | Massachusetts |
| 26 | William Jensen THIS PERSON | 19 | Son | New Worker | Massachusetts |
| 27 | Esther Jensen | 14 | Daughter | — | Massachusetts |
| 28 | Rose Jensen | 12 | Daughter | — | Massachusetts |
| 29 | Frances Jensen | 12 | Daughter | — | Massachusetts |
| 30 | Barbara Jensen | 10 | Daughter | — | Massachusetts |
| 31 | Kenneth Bottomley | 31 | Head | Superintendent | Massachusetts |
| 32 | Elizabeth Flanagan | 60 | Aunt | Registered Nurse | Vermont |
| 33 | John Hallett | 80 | Lodger | — | Massachusetts |
| 34 | John Farrell | 71 | Lodger | — | Massachusetts |
| 35 | Thomas Haskin | 86 | Lodger | — | Massachusetts |
| 36 | Hugh Fox | 87 | Lodger | — | Maine |
| 37 | Penelope Mcguire | 72 | Lodger | — | Eire |
| 38 | Margaret Foley | 20 | Lodger | — | Massachusetts |
| 39 | Delia Jordan | 63 | Lodger | — | Eire |
| 40 | Hettie Ingerson | 78 | Lodger | — | New York |
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)