MJ
Mary Jensen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cass-County, Iowa
Our Model Tree links this Mary Jensen across the 1930 and 1940 US Censuses in Cass-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 8-person household.
Age 14
b. ~1926
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cass-County, Iowa |
| Surname | Jensen |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Marne town |
| 1935 Residence (County) | Brighton |
| Additional Details | |
| Highest Grade | 7 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Marne Town |
| Est. Birth Year | ~1926 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Helen Jensen | Daughter | — | 17 | ~1923 |
| Margie Jensen | Daughter | — | 15 | ~1925 |
| Mary Jensen | Daughter | — | 14 | ~1926 |
| Catherine Jensen | Daughter | — | 2 | ~1938 |
| Warner Jensen | Head | — | 43 | ~1897 |
| Owen Jensen | Son | — | 11 | ~1929 |
| Elwin Jensen | Son | — | 3 | ~1937 |
| Ruth Jensen | Spouse | — | 41 | ~1899 |
Census Appearances
1930
Cass, Iowa
Daughter, age 4
Cass, Iowa · implied b. ~1926 — 50 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Cass-County, Iowa
Daughter, age 14
Cass-County, Iowa · implied b. ~1926 — 8 household members
| Surname | Jensen |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Marne town |
| 1935 Residence (County) | Brighton |
| Highest Grade | 7 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Mary Jensen across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Jensen
Daughter · 1940 · age 14 · b. ~1926 · Iowa
★ You are viewing this record
Sibling
Margie Jensen
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Jensen
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elwin Jensen
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Jensen
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Owen Jensen
Sibling · 1940 · age 11
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 — Cass-County, Iowa
Open full size
1940 US Federal Census — Cass-County, Iowa
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-01145-00224)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Darlene Manning | 13 | Daughter | — | Iowa |
| 42 | Leona Manning | 11 | Daughter | — | Iowa |
| 43 | Charles J Henderson | 61 | Head | Minister | Iowa |
| 44 | Meda Henderson | 58 | Wife | — | Iowa |
| 45 | Margit Henderson | 19 | Daughter | Housekeeping | Iowa |
| 46 | Murray Tailor | 63 | Head | Retired Farmer | Iowa |
| 47 | Clara Tailor | 58 | Wife | — | Illinois |
| 48 | Junior Hanson | 61 | Head | Mechanic | Denmark |
| 49 | Christine Hanson | 56 | Wife | — | Denmark |
| 50 | Lillian Hanson | 14 | Daughter | — | Iowa |
| 51 | Pearl Wheatley | 52 | Head | Clerk | Iowa |
| 52 | Warner Jensen | 43 | Head | Farming | Iowa |
| 53 | Ruth Jensen | 41 | Wife | — | Iowa |
| 54 | Helen Jensen | 17 | Daughter | — | Iowa |
| 55 | Margie Jensen | 15 | Daughter | — | Iowa |
| 56 | Mary Jensen THIS PERSON | 14 | Daughter | — | Iowa |
| 57 | Owen Jensen | 11 | Son | — | Iowa |
| 58 | Elwin Jensen | 3 | Son | — | Iowa |
| 59 | Catherine Jensen | 2 | Daughter | — | Iowa |
| 60 | Lester O Wheatley | 60 | Head | Operator | Wisconsin |
| 61 | Inez Renolds | 60 | Head | — | Iowa |
| 62 | Lola Renolds | 29 | Daughter | Housekeeping | Iowa |
| 63 | Frank Bannister | 42 | Head | Bridge Laborer | Illinois |
| 64 | Bertha Bannister | 40 | Wife | — | Illinois |
| 65 | Mervin Bannister | 18 | Son | Field Laborer | Iowa |
| 66 | Dorothy Bannister | 17 | Daughter | Housekeeping | Iowa |
| 67 | Ruby Jean Bannister | 15 | Daughter | — | Iowa |
| 68 | Orvill Bannister | 13 | Son | — | Iowa |
| 69 | Richard Bannister | 11 | Son | — | Iowa |
| 70 | Robert Bannister | 7 | Son | — | Iowa |
| 71 | Vernice Ann Bannister | 3 | Daughter | — | Iowa |
| 72 | Peter Larsen | 52 | Head | Farming | Iowa |
| 73 | Joe Peters | 47 | Head | Section Laborer | Illinois |
| 74 | Matilda Peters | 45 | Wife | — | Iowa |
| 75 | Joydean Peters | 15 | Daughter | — | Colorado |
| 76 | Harmonjane Peters | 13 | Daughter | — | Iowa |
| 77 | Janice Peters | 5 | Daughter | — | Iowa |
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)