HS
Herbert Smith — 1940 US Census Record
Model Tree available1940 United States Federal Census · Johnson-County, Iowa
Our Model Tree links this Herbert Smith across the 1920, 1930 and 1940 US Censuses in Johnson-County, Iowa (XGBoost, ~Confirmed), with identified parents Clara & Caleb — first a son (b.~1918), then head of a 4-person household.
Age 22
b. ~1918
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Johnson-County, Iowa |
| Surname | Smith |
| Given Name | Herbert B. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Iowa City |
| 1935 Residence (County) | Johnson |
| Additional Details | |
| Highest Grade | C-3 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Iowa City |
| Est. Birth Year | ~1918 |
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 Herbert | Age | Birth yr |
|---|---|---|---|---|
| Earle Smith | Head | — | 56 | ~1884 |
| Isabel Bonnewell | Other | — | 78 | ~1862 |
| Herbert Smith | Son | — | 22 | ~1918 |
| Clara Smith | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Johnson, Iowa
Son, age 1
Johnson, Iowa · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Herbert B. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Johnson, Iowa
Son, age 12
Johnson, Iowa · implied b. ~1918 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Herbert B. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Johnson-County, Iowa
Son, age 22
Johnson-County, Iowa · implied b. ~1918 — 4 household members
| Surname | Smith |
| Given Name | Herbert B. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Iowa City |
| 1935 Residence (County) | Johnson |
| Highest Grade | C-3 |
| 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 Herbert Smith across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Clara Smith (~0.92 confidence) and father Caleb Smith (~0.92 confidence) and father Earle Smith (~0.92 confidence) and mother Clara Smith (~0.92 confidence) and father Clyde Smith (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Clara Smith
b. ~1882
Source mother
● Household
· direct · ~0.92
Father
Caleb Smith
b. ~1884
Source father
● Household
· direct · ~0.92
Father
Earle Smith
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Clara Smith
b. ~1884
Source mother
● Household
· direct · ~0.92
Father
Clyde Smith
b. ~1885
Source father
● Household
· direct · ~0.92
This person
Anchor record
Herbert Smith
Son · 1940 · age 22 · b. ~1918 · 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 — Johnson-County, Iowa
Open full size
1940 US Federal Census — Johnson-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01171-00646)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Walter L. Slife | 44 | Head | Salesman | Iowa |
| 42 | Mabel G. Slife | 46 | Wife | — | Illinois |
| 43 | Ruth L. Slife | 20 | Daughter | — | California |
| 44 | Charlotte L. Slife | 16 | Daughter | — | Illinois |
| 45 | Forrest E. Hignett | 23 | Head | — | Iowa |
| 46 | Joy E. Hignett | 23 | Wife | Social Worker | Iowa |
| 47 | Gary E. Hignett | 0 | Son | — | Iowa |
| 48 | Ruth M. Hignett | 21 | Sister | Typist | Iowa |
| 49 | Eunice Radley | 64 | Mother-in-law | House Work | Iowa |
| 50 | Mabel H. Davis | 51 | Head | — | Iowa |
| 51 | Joseph Droczyk | 45 | Lodger | Upholsterer | Poland |
| 52 | Earle B. Smith | 56 | Head | Professor History | Illinois |
| 53 | Clara B. Smith | 58 | Wife | — | Iowa |
| 54 | Herbert B. Smith THIS PERSON | 22 | Son | — | Iowa |
| 55 | Isabel Bonnewell | 78 | Mother-in-law | — | North Carolina |
| 56 | Lincoln R. Reid | 58 | Head | Ambulance Driver | Iowa |
| 57 | Nellie Reid | 54 | Wife | — | Iowa |
| 58 | Inez Reid | 27 | Niece | Book Keeper | Iowa |
| 59 | Henry A. Moore | 58 | Head | Carpenter | Iowa |
| 60 | Agnes B. Moore | 57 | Wife | — | Iowa |
| 61 | Kenneth J. Kadlec | 26 | Head | Butcher Meat Cutter | Iowa |
| 62 | Margaret E. Kadlec | 18 | Wife | — | Iowa |
| 63 | Godske Kadlec | 30 | Lodger | Meat Cutter | Iowa |
| 64 | Catherine Kadlec | 27 | Wife | — | Iowa |
| 65 | Nella N. Pepler | 39 | Head | Technician | Iowa |
| 66 | Norma L. Pepler | 29 | Sister | Teacher | Iowa |
| 67 | Clara Pepler | 57 | Mother | — | Iowa |
| 68 | Hector F. Marceau | 55 | Head | Baker | Kansas |
| 69 | Evelyn E. Marceau | 49 | Wife | — | Illinois |
| 70 | Rita M. Marceau | 18 | Daughter | — | Iowa |
| 71 | William F. Bristel | 58 | Head | Assistant Professor | Indiana |
| 72 | Myrl L. Bristel | 48 | Wife | — | Indiana |
| 73 | Mary T. Newell | 35 | Roomer | Librarian | Iowa |
| 74 | Caroline Maybrook | 39 | Roomer | Manager | Iowa |
| 75 | James H. Weir | 63 | Head | Conductor | Iowa |
| 76 | Ellen A. Weir | 49 | Wife | — | Iowa |
| 77 | Mary S. Weir | 18 | Daughter | Operator | Iowa |
| 78 | Florence M. Tully | 49 | Head | Secretary | Iowa |
| 79 | Gene V. Tully | 44 | Sister | — | Iowa |
| 80 | Frank H. Mccabe | 29 | Head | Janitor | Iowa |
Pedigree Summary
Herbert
Gen 1 · 5 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)