JC
John Carson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this John Carson across the 1920, 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed), with identified parents George & Harry — first a head (b.~1905), then head of a 5-person household.
Age 35
b. ~1905
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Carson |
| Given Name | John B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Steam Railway |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1700 |
| Highest Grade | C 3 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Stenographer |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1905 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| John Carson | Head | — | 35 | ~1905 |
| Kent Carson | Son | — | 2 | ~1938 |
| Evelyn Cavanaugh | Other | — | 15 | ~1925 |
| Kay Carson | Daughter | — | 5 | ~1935 |
| Marjorie Carson | Spouse | — | 28 | ~1912 |
Census Appearances
1920
Black Hawk, …
Son, age 15
Black Hawk, Iowa · implied b. ~1905 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Corson |
| Given Name | John B |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Black Hawk, …
Son, age 25
Black Hawk, Iowa · implied b. ~1905 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Corson |
| Given Name | John B. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Iowa |
| Age at First Marriage | Nev |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Clerk |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Head, age 35
Black-Hawk-County, Iowa · implied b. ~1905 — 5 household members
| Surname | Carson |
| Given Name | John B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Occupation | Stenographer |
| Industry | Steam Railway |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1700 |
| Highest Grade | C 3 |
| 1935 Residence | Same house |
| 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 John Carson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father George Corson (~0.92 confidence) and father Harry Corson (~0.92 confidence) and mother Myrtle Corson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
George Corson
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Harry Corson
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Myrtle Corson
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Carson
Head · 1940 · age 35 · b. ~1905 · 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
39 people indexed on this census page (nara:1940:m-t0627-01139-00845)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ona Allgood | 20 | Daughter | Saleslady | Minnesota |
| 42 | John Allgood | 16 | Son | — | Iowa |
| 43 | Larry Allgood | 1 | Son | — | Iowa |
| 44 | Ivan Wiegand | 44 | Head | Office Manager | Illinois |
| 45 | Helen Wiegand | 44 | Wife | — | Iowa |
| 46 | Elaine Wiegand | 21 | Daughter | — | Iowa |
| 47 | Theodore A. Genn | 51 | Head | Salesman | Iowa |
| 48 | Marion Genn | 45 | Wife | — | Iowa |
| 49 | Loyd Shepherd | 39 | Head | Supervisor | Iowa |
| 50 | Adele Shepherd | 35 | Wife | — | Iowa |
| 51 | Maxwell Shepherd | 20 | Son | Machine Shop | Iowa |
| 52 | Robert Shepherd | 18 | Son | — | Iowa |
| 53 | Esther Shepherd | 16 | Daughter | — | Iowa |
| 54 | Ernest Mixdorf | 47 | Lodger | Barber | Iowa |
| 55 | John B. Carson THIS PERSON | 35 | Head | Stenographer | Iowa |
| 56 | Marjorie Carson | 28 | Wife | — | Iowa |
| 57 | Kay Carson | 5 | Daughter | — | Iowa |
| 58 | Kent Carson | 2 | Son | — | Iowa |
| 59 | Evelyn Cavanaugh | 15 | Lodger | — | Iowa |
| 60 | John S. Hershberger | 80 | Head | — | Iowa |
| 61 | Lucy Hershberger | 45 | Wife | — | Iowa |
| 62 | Marlon Cunningham | 36 | Head | Department Manager | Iowa |
| 63 | Helen Cunningham | 28 | Wife | — | Iowa |
| 64 | Larry Cunningham | 5 | Son | — | Iowa |
| 65 | Henry S. Yount | 55 | Head | Assistant Inspector | Iowa |
| 66 | Amy M. Yount | 46 | Wife | — | Iowa |
| 67 | Richard Yount | 19 | Son | — | Iowa |
| 68 | Dorothy Yount | 16 | Daughter | — | Iowa |
| 69 | Ralph S. Winterbottom | 46 | Head | Sales Manager | Nebraska |
| 70 | Mary Winterbottom | 47 | Wife | — | Iowa |
| 71 | Rod Winterbottom | 22 | Son | — | Iowa |
| 72 | Ralph Winterbottom | 16 | Son | — | Iowa |
| 73 | Joan Winterbottom | 14 | Daughter | — | Iowa |
| 75 | Willis Hammerling | 64 | Head | — | Iowa |
| 76 | Lillian Hammerling | 60 | Wife | — | Iowa |
| 77 | Edward N. Allan | 52 | Head | Salesman | Illinois |
| 78 | Beulah L. Allan | 46 | Wife | — | Iowa |
| 79 | Opha C. Thomas | 72 | Mother-in-law | — | Iowa |
| 80 | Edward D. Stevens | 32 | Head | Branch Manager | Iowa |
Pedigree Summary
John
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)