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James Jensen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this James Jensen across the 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1883), then head of a 9-person household.
Age 57
b. ~1883
Male
Head
Born: Denmark
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Jensen |
| Given Name | James C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | farmer |
| Industry | farm |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 300 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
| Occupation | Farmer |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1883 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| James Jensen | Head | — | 57 | ~1883 |
| Wayne Jensen | Son | — | 16 | ~1924 |
| Joan Jensen | Daughter | — | 9 | ~1931 |
| Marion Jensen | Daughter | — | 23 | ~1917 |
| James Jensen | Son | — | 19 | ~1921 |
| Alice Jensen | Daughter | — | 14 | ~1926 |
| Milo Jensen | Son | — | 21 | ~1919 |
| Elsie Jensen | Spouse | — | 45 | ~1895 |
| Patricia Jensen | Daughter | — | 12 | ~1928 |
Census Appearances
1930
Black Hawk, …
Head, age 44
Black Hawk, Iowa · implied b. ~1886 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | James C |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Denmark |
| Naturalization Status | Naturalized |
| Year of Immigration | 1903 |
| Age at First Marriage | 22 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | R |
| Home Value / Rent | 18 |
| Veteran | No |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1940
Black-Hawk-County, Iowa
Head, age 57
Black-Hawk-County, Iowa · implied b. ~1883 — 9 household members
| Surname | Jensen |
| Given Name | James C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Naturalization Status | Naturalized |
| Occupation | farmer |
| Industry | farm |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 300 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
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
Head · 1940 · age 57 · b. ~1883 · Iowa
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Black-Hawk-County, Iowa
Open full size
1940 US Federal Census — Black-Hawk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01140-00049)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James C. Jensen THIS PERSON | 57 | Head | Farmer | Denmark |
| 42 | Elsie Jensen | 45 | Wife | Housewife | Denmark |
| 43 | Marion Jensen | 23 | Daughter | Seamstress | Iowa |
| 44 | Milo Jensen | 21 | Son | Shipper | Iowa |
| 45 | James Jensen | 19 | Son | — | Iowa |
| 46 | Wayne Jensen | 16 | Son | — | Iowa |
| 47 | Alice Jensen | 14 | Daughter | — | Iowa |
| 48 | Patricia Jensen | 12 | Daughter | — | Iowa |
| 49 | Joan Jensen | 9 | Daughter | — | Iowa |
| 50 | Alfred Jones | 30 | Head | Beef Man | Missouri |
| 51 | Dorothy Jones | 24 | Wife | Housewife | Iowa |
| 52 | Patricia Ann Jones | 3 | Daughter | — | Iowa |
| 53 | Eli Bruce | 40 | Head | Trucker | Iowa |
| 54 | Gladys Bruce | 34 | Wife | Housewife | Iowa |
| 55 | Madeline Bruce | 8 | Daughter | — | Iowa |
| 56 | Tyndall Mussins | 36 | Head | Machinist | Iowa |
| 57 | Ruby A. Mussins | 35 | Wife | Housewife | Indiana |
| 58 | James Higgins | 18 | Step son | — | Indiana |
| 59 | Jesse E. Ruby | 40 | Head | Housewife | Iowa |
| 60 | Hazel E. Ruby | 25 | Wife | — | Iowa |
| 61 | Delbert Ruby | 9 | Son | — | Iowa |
| 62 | Jesse Jr. Ruby | 7 | Son | — | Iowa |
| 63 | Betty J. Ruby | 5 | Daughter | — | Iowa |
| 64 | Billy E. Ruby | 4 | Son | — | Iowa |
| 65 | Elsa L. Ruby | 1 | Daughter | — | Iowa |
| 66 | Clarence Wilcox | 55 | Head | Toolmaker | Nebraska |
| 67 | Cecil Wilcox | 51 | Wife | Housewife | Iowa |
| 68 | Robert Wilcox | 9 | Son | — | Iowa |
| 69 | Max Turner | 42 | Head | Inspector | Iowa |
| 70 | Dorothy Turner | 29 | Wife | Housewife | Illinois |
| 71 | Ellen Turner | 6 | Daughter | — | Iowa |
| 72 | Richard G. Turner | 5 | Son | — | Iowa |
| 73 | Fred Clouse | 31 | Head | Machine Man | Iowa |
| 74 | Emma P. Clouse | 26 | Wife | Housewife | Indiana |
| 75 | Jerry Clouse | 6 | Son | — | Iowa |
| 76 | James Clouse | 2 | Son | — | Iowa |
| 77 | Carol Clouse | 0 | Daughter | — | Iowa |
| 78 | Leroy Featherman | 28 | Head | Grinder | Iowa |
| 79 | Ruby Featherman | 30 | Wife | Housewife | England |
| 80 | Marilyn Featherman | 7 | 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)