HS
Harry Smith — 1940 US Census Record
Model Tree available1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Harry Smith across the 1920, 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1903), then head of a 5-person household.
Age 37
b. ~1903
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Smith |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo city |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Occupation | Quarry |
| Industry | Farm market |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 312 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Quarry |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1903 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harry | Age | Birth yr |
|---|---|---|---|---|
| Marguerite Smith | Daughter | — | 21 | ~1919 |
| Hildegard Smith | Daughter | — | 17 | ~1923 |
| Maggie Smith | Head | — | 53 | ~1887 |
| William Smith | Son | — | 23 | ~1917 |
| Harry Smith | Son | — | 37 | ~1903 |
Census Appearances
1920
Black Hawk, …
Son, age 17
Black Hawk, Iowa · implied b. ~1903 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Harry |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | laborer |
| Industry | garage |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Black Hawk, …
Son, age 28
Black Hawk, Iowa · implied b. ~1902 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Iowa |
| Age at First Marriage | 28 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Laborer |
| Industry | Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Son, age 37
Black-Hawk-County, Iowa · implied b. ~1903 — 5 household members
| Surname | Smith |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo city |
| 1935 Residence (County) | Black Hawk |
| Occupation | Quarry |
| Industry | Farm market |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 312 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| 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 Harry Smith across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Smith (~0.92 confidence) and father John Smith (~0.92 confidence) and mother Maggie Smith (~0.92 confidence) and mother Maggie Smith (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Smith
b. ~1863
Source father
● Household
· direct · ~0.92
Father
John Smith
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Maggie Smith
b. ~1873
Source mother
● Household
· direct · ~0.92
Mother
Maggie Smith
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harry Smith
Son · 1940 · age 37 · b. ~1903 · Iowa
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Sibling
Marguerite Smith
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Smith
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hildegard Smith
Sibling · 1940 · age 17
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 — 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-t0627-01140-00351)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marguerite Ladd | 54 | Wife | — | Minnesota |
| 2 | Donald Ladd | 16 | Son | — | North Dakota |
| 3 | Leslie Ladd | 15 | Son | — | North Dakota |
| 4 | Henry Nordman | 71 | Head | — | Germany |
| 5 | Ernestine Nordman | 63 | Wife | — | Iowa |
| 6 | John Bloes | 38 | Head | Molder | Minnesota |
| 7 | Jessie Bloes | 37 | Wife | — | Iowa |
| 8 | Kathryn Bloes | 14 | Daughter | — | Iowa |
| 9 | John Schutte | 50 | Lodger | Assembly | Iowa |
| 10 | George Cox | 21 | Head | Laborer | Iowa |
| 11 | Verna Cox | 18 | Wife | — | Iowa |
| 12 | Clifford Houtz | 34 | Head | Tool Man | Iowa |
| 13 | Josephine Houtz | 38 | Wife | — | Iowa |
| 14 | Jefferson Blocks | None | Street | — | — |
| 15 | Jay M. Maynard | 44 | Head | Shipping | Iowa |
| 16 | Jennie Maynard | 37 | Wife | — | Iowa |
| 17 | Charles Maynard | 20 | Son | — | Iowa |
| 18 | Arda Maynard | 16 | Daughter | — | Iowa |
| 19 | Arlyce Hazelhoff | 18 | Niece | House Work | Iowa |
| 20 | Leonard Gustafson | 36 | Head | Operator | Iowa |
| 21 | Bernice Gustafson | 34 | Wife | — | Iowa |
| 22 | Lois Gustafson | 15 | Daughter | — | Iowa |
| 23 | Joyce Gustafson | 7 | Daughter | — | Iowa |
| 24 | Leonard Gustafson | 5 | Son | — | Iowa |
| 25 | Eliza S. Duke | 72 | Head | — | Iowa |
| 26 | Robert H. Pashby | 51 | Son in l | Maintenance | Iowa |
| 27 | Jessie Mae Pashby | 42 | Daughter | — | Iowa |
| 28 | Maggie Smith | 53 | Head | — | Germany |
| 29 | Harry Smith THIS PERSON | 37 | Son | Quarry | Iowa |
| 30 | William Smith | 23 | Son | Messenger | Iowa |
| 31 | Marguerite Smith | 21 | Daughter | Waitress | Iowa |
| 32 | Hildegard Smith | 17 | Daughter | — | Iowa |
| 33 | Thorwald Peterson | 56 | Head | — | Iowa |
| 34 | Marlous Peterson | 16 | Daughter | — | Iowa |
| 35 | Waunita Peterson | 14 | Daughter | — | Iowa |
| 36 | Andrew P. King | 43 | Head | Assembly | Iowa |
| 37 | Irine King | 30 | Wife | — | Virginia |
| 38 | Charles L. King | 11 | Son | — | Iowa |
| 39 | Dirline King | 10 | Daughter | — | Iowa |
| 40 | Jerald King | 8 | Son | — | Iowa |
Pedigree Summary
Harry + 3 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)