TS
Theodore Smith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Theodore Smith across the 1920, 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1866), then head of a 4-person household.
Age 74
b. ~1866
Male
Head
Born: Denmark
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Smith |
| Given Name | Theodore |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 74 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Farmer |
| Industry | Own Farm |
| Class of Worker | OA |
| Hours Worked | 4 |
| Income (1939) | 0 |
| Highest Grade | G 8 |
| 1935 Residence | Same House |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
| Occupation | Farmer |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1866 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Theodore | Age | Birth yr |
|---|---|---|---|---|
| Violet Smith | Daughter | — | 20 | ~1920 |
| Myrtle Smith | Daughter | — | 28 | ~1912 |
| Theodore Smith | Head | — | 74 | ~1866 |
| Elizabeth Smith | Spouse | — | 63 | ~1877 |
Census Appearances
1920
Black Hawk, …
Head, age 53
Black Hawk, Iowa · implied b. ~1867 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Theodore |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Denmark |
| Naturalization Status | Un |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Carpenter |
| Industry | factory |
| Class of Worker | W |
| Can Read | No |
| Can Write | No |
| Speaks English | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1930
Black Hawk, …
Head, age 64
Black Hawk, Iowa · implied b. ~1866 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 64 |
| Marital Status | Married |
| Birthplace | Denmark |
| Naturalization Status | Naturalized |
| Year of Immigration | 1880 |
| Age at First Marriage | 42 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Cabinet Maker |
| Industry | Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | O |
| Home Value / Rent | 5000 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1940
Black-Hawk-County, Iowa
Head, age 74
Black-Hawk-County, Iowa · implied b. ~1866 — 4 household members
| Surname | Smith |
| Given Name | Theodore |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 74 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Naturalization Status | Naturalized |
| Occupation | Farmer |
| Industry | Own Farm |
| Class of Worker | OA |
| Hours Worked | 4 |
| Income (1939) | 0 |
| Highest Grade | G 8 |
| 1935 Residence | Same House |
| 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 Theodore Smith across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Theodore Smith
Head · 1940 · age 74 · b. ~1866 · 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-t0627-01139-00901)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Audrey Hardy | 9 | Daughter | — | Iowa |
| 2 | Otto J. Biesner | 54 | Head | Woodworker | Germany |
| 3 | Elva A. Biesner | 49 | Wife | — | Germany |
| 4 | Paul Biesner | 24 | Son | Cement Worker | Iowa |
| 5 | Esther Biesner | 18 | Daughter | — | Iowa |
| 6 | Lillian Biesner | 16 | Daughter | — | Iowa |
| 7 | Gerald Biesner | 13 | Son | — | Iowa |
| 8 | Dorothy Biesner | 8 | Daughter | — | Iowa |
| 9 | John Whitney | 56 | Head | Machinist | North Dakota |
| 10 | Isabel Whitney | 54 | Wife | — | Iowa |
| 11 | Lucy Elliott | 88 | Mother-in-law | — | Pennsylvania |
| 12 | Theodore Smith THIS PERSON | 74 | Head | Farmer | Denmark |
| 13 | Elizabeth Smith | 63 | Wife | — | Iowa |
| 14 | Myrtle E. Smith | 28 | Daughter | Waitress | Iowa |
| 15 | Violet C. Smith | 20 | Daughter | Bookkeeper | Iowa |
| 16 | James Costello | 32 | Head | Foundry | Iowa |
| 17 | Marjorie Costello | 33 | Wife | — | Iowa |
| 18 | Emmett Durham | 24 | Head | Inspector | Iowa |
| 19 | Mary A. Durham | 21 | Wife | — | Iowa |
| 20 | Marjorie Mccunniff | 18 | Sister-in-law | Waitress | Iowa |
| 21 | Clarence Martin | 39 | Head | Metal Worker | Iowa |
| 22 | Iona Martin | 34 | Wife | — | Iowa |
| 23 | Alasia Roberson | 48 | Head | Laundress | Michigan |
| 24 | Leslie Meyer | 38 | Head | Precision Machinist | Iowa |
| 25 | Louise Meyer | 36 | Wife | — | Iowa |
| 26 | Marilyn Meyer | 15 | Daughter | — | Iowa |
| 27 | Wilford Meyer | 13 | Son | — | Iowa |
| 28 | Gordon Meyer | 11 | Son | — | Iowa |
| 29 | Kenneth Meyer | 9 | Son | — | Iowa |
| 30 | Albert Lehner | 38 | Head | Millroom Worker | Iowa |
| 31 | Iona Lehner | 30 | Wife | — | Iowa |
| 32 | Verda M. Lehner | 11 | Daughter | — | Iowa |
| 33 | Ruth Lehner | 9 | Daughter | — | Iowa |
| 34 | Richard Lehner | 7 | Son | — | Iowa |
| 35 | Frances Lehner | 5 | Son | — | Iowa |
| 36 | Virgil Lehner | 3 | Son | — | Iowa |
| 37 | Alberta D. Lehner | 2 | Daughter | — | Iowa |
| 38 | George Wyman | 35 | Head | Elevator Operator | New York |
| 39 | Myrtle P. Wyman | 35 | Wife | — | Iowa |
| 40 | Elsie A. Wyman | 15 | 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)