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James Jensen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this James Jensen across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1927), then head of a 8-person household.
Age 13
b. ~1927
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Jensen |
| Given Name | James J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1927 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Loretta Jensen | Spouse | — | 43 | ~1897 |
| James Jensen | Son | — | 13 | ~1927 |
| Kenneth Jensen | Son | — | 10 | ~1930 |
| Loretta Jensen | Daughter | — | 14 | ~1926 |
| Walter Jensen | Son | — | 18 | ~1922 |
| Margaret Jensen | Daughter | — | 17 | ~1923 |
| Marion Jensen | Daughter | — | 19 | ~1921 |
| Walter Jensen | Head | — | 46 | ~1894 |
Census Appearances
1930
Cook, Illinois
Son, age 3
Cook, Illinois · implied b. ~1927 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | James Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Indiana |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 13
Cook-County, Illinois · implied b. ~1927 — 8 household members
| Surname | Jensen |
| Given Name | James J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 James Jensen across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Jensen
Son · 1940 · age 13 · b. ~1927 · Illinois
★ You are viewing this record
Sibling
Marion Jensen
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Jensen
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kenneth Jensen
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Jensen
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Loretta 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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-00937-00266)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frank Haydock | 53 | Head | Vice Tackmaker | Illinois |
| 42 | Barbara Haydock | 57 | Wife | — | Illinois |
| 43 | Oliver J. Nolan | 69 | Head | — | Illinois |
| 44 | Oliver L. Nolan | 29 | Son | Flyer Signet | Illinois |
| 45 | Frank Michalski | 54 | Head | Foreman Milling | Illinois |
| 46 | Anne Michalski | 45 | Wife | — | Illinois |
| 47 | Robert Michalski | 25 | Son | — | Illinois |
| 48 | William J. Douglas | 54 | Head | Stationary Engineer | Indiana |
| 49 | Hattie A. Douglas | 52 | Wife | — | Illinois |
| 50 | Mary R. Douglas | 17 | Daughter | — | Illinois |
| 51 | Arthur Sim | 67 | Roomer | Granite Cutter | Scotland |
| 52 | Francis Sim | 37 | Roomer | Proprietor | Indiana |
| 53 | Bessie Lappie | 29 | Head | General Office | Illinois |
| 54 | William J. Hallow | 53 | Head | Department Clerk | Wisconsin |
| 55 | Richard C. Hallow | 25 | Son | Truck Driver | Illinois |
| 56 | Fred Wagoner | 24 | Head | Restaurant | Ohio |
| 57 | Lois Wagoner | 23 | Wife | — | Illinois |
| 58 | Gail Wagoner | 1 | Daughter | — | Illinois |
| 59 | Herbert Stevens | 23 | Head | Auto Dressing | Illinois |
| 60 | Marion Stevens | 21 | Wife | Presser | Illinois |
| 61 | William H. Bridge | 73 | Head | Janitor | England |
| 62 | Ann Bridge | 70 | Wife | — | England |
| 63 | Janet Bridge | 51 | Daughter | — | England |
| 64 | Nabor Ortiz | 56 | Head | Revenue Agent | Colorado |
| 65 | Pearl E. Ortiz | 53 | Wife | — | Indiana |
| 66 | June Ortiz | 18 | Daughter | Office Work | Illinois |
| 67 | Ruby Sigler | 27 | Head | Dressmaker | Montana |
| 68 | Jessie Sigler | 25 | Sister | Dressmaker | Montana |
| 69 | Joyce Sigler | 22 | Sister | Dressmaker | South Dakota |
| 70 | Walter T. Jensen | 46 | Head | Egg Inspector | Denmark |
| 71 | Loretta M. Jensen | 43 | Wife | — | Illinois |
| 72 | Marion R. Jensen | 19 | Daughter | Secretary | Illinois |
| 73 | Walter B. Jensen | 18 | Son | — | Illinois |
| 74 | Margaret T. Jensen | 17 | Daughter | — | Illinois |
| 75 | Loretta M. Jensen | 14 | Daughter | — | Illinois |
| 76 | James J. Jensen THIS PERSON | 13 | Son | — | Illinois |
| 77 | Kenneth D. Jensen | 10 | Son | — | Illinois |
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)