RS
Roger Smith — 1940 US Census Record
Model Tree available1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Roger Smith across the 1920, 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed), with identified parents H & Pearl — first a son (b.~1916), then head of a 2-person household.
Age 24
b. ~1916
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Smith |
| Given Name | Roger |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | City of Waterloo |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Occupation | Fireman |
| Industry | City Fire Dept. |
| Class of Worker | GW |
| Hours Worked | 84 |
| Income (1939) | 740 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Fireman |
| Township / Ward | City Of Waterloo |
| Est. Birth Year | ~1916 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Roger | Age | Birth yr |
|---|---|---|---|---|
| Pearl Smith | Head | — | 52 | ~1888 |
| Roger Smith | Son | — | 24 | ~1916 |
Census Appearances
1920
Blackhawk, Iowa
Son, age 4
Blackhawk, Iowa · implied b. ~1916 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Roger |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Black Hawk, …
Son, age 14
Black Hawk, Iowa · implied b. ~1916 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Roger H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Son, age 24
Black-Hawk-County, Iowa · implied b. ~1916 — 2 household members
| Surname | Smith |
| Given Name | Roger |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | City of Waterloo |
| 1935 Residence (County) | Black Hawk |
| Occupation | Fireman |
| Industry | City Fire Dept. |
| Class of Worker | GW |
| Hours Worked | 84 |
| Income (1939) | 740 |
| Highest Grade | H-4 |
| 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 Roger Smith across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father H Smith (~0.92 confidence) and mother Pearl Smith (~0.92 confidence) and mother Pearl Smith (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
H Smith
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Pearl Smith
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Pearl Smith
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Roger Smith
Son · 1940 · age 24 · b. ~1916 · Iowa
★ You are viewing this record
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-t0627-01140-00594)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Kenneth Cole | 23 | Son | Production Man | Iowa |
| 42 | Celine Cole | 20 | Daughter-in-law | — | Iowa |
| 43 | Archie Mckinney | 40 | Head | Fire Inspector | Missouri |
| 44 | Virgie Mckinney | 32 | Wife | — | Iowa |
| 45 | Donald Mckinney | 11 | Son | — | Iowa |
| 46 | Joyce Mckinney | 5 | Daughter | — | Iowa |
| 47 | Edwin Carnes | 29 | Head | Meter Operator | Iowa |
| 48 | Lorraine Carnes | 24 | Wife | Casing | Missouri |
| 49 | Jack Carnes | 4 | Son | — | Iowa |
| 50 | Pearl Smith | 52 | Head | — | Iowa |
| 51 | Roger Smith THIS PERSON | 24 | Son | Fireman | Iowa |
| 52 | George T. Booth | 39 | Head | Fresh Meat | Iowa |
| 53 | Ethel B. Booth | 30 | Wife | — | Iowa |
| 54 | Leonard Booth | 10 | Son | — | Iowa |
| 55 | Roger Booth | 8 | Son | — | Iowa |
| 56 | Richard Booth | 5 | Son | — | Iowa |
| 57 | Robert Booth | 2 | Son | — | Iowa |
| 58 | Clyde Edwards | 54 | Head | Remaster Leader | Iowa |
| 59 | Erma Edwards | 49 | Wife | — | Iowa |
| 60 | Gerald Edwards | 23 | Son | Plasterer | Iowa |
| 61 | Lela Edwards | 16 | Daughter | — | Iowa |
| 62 | Darla Edwards | 15 | Daughter | — | Iowa |
| 63 | Arline Stalford | 23 | Lodger | Smoked Meat | Iowa |
| 64 | Thelma Billington | 20 | Lodger | Specialty | Missouri |
| 65 | Theodore Black | 76 | Lodger | — | Pennsylvania |
| 66 | Nellie Black | 68 | Lodger | — | Illinois |
| 67 | Steve Balabon | 46 | Head | Hide Cellar | Russia |
| 68 | Nellie Balabon | 38 | Wife | — | Russia |
| 69 | Tom Balabon | 21 | Son | Trimming | Montana |
| 70 | Mary Paulsen | 19 | Daughter | — | Montana |
| 71 | Kenneth Balabon | 31 | Son-in-law | Loading | Minnesota |
| 72 | Helen Balabon | 15 | Daughter | — | Michigan |
| 73 | Lloyd Olson | 29 | Lodger | Laborer | Montana |
| 74 | Nick Toneff | 52 | Lodger | Laborer | Bulgaria |
| 75 | Herman Markley | 59 | Head | Janitor | Germany |
| 76 | Erma Markley | 60 | Wife | — | Iowa |
| 77 | John Eastman | 52 | Lodger | Machinist | Iowa |
| 78 | Vera Randall | 37 | Head | — | Iowa |
| 79 | Virgil Mattson | 21 | Son | Clerks | Iowa |
| 80 | Bernard Galey | 33 | Lodger | Salt Cellar | Iowa |
Pedigree Summary
Roger
Gen 1 · 3 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)