TJ
Theodore Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mahaska-County, Iowa
Our Model Tree links this Theodore Johnson across the 1910, 1920, 1930 and 1940 US Censuses in Mahaska-County, Iowa (XGBoost, ~Confirmed), with identified parents Charles & S — 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 | Mahaska-County, Iowa |
| Surname | Johnson |
| Given Name | Theodore T. @ |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Jefferson Twp. |
| 1935 Residence (County) | Mahaska |
| Additional Details | |
| Occupation | Laborer |
| Industry | School Bus |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 500 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Laborer |
| Township / Ward | Jefferson Twp |
| 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 Theodore | Age | Birth yr |
|---|---|---|---|---|
| Donna Johnson | Daughter | — | 8 | ~1932 |
| Theodore Johnson | Head | — | 35 | ~1905 |
| Theodore Johnson | Son | — | 14 | ~1926 |
| Delbert Johnson | Son | — | 10 | ~1930 |
| Helen Johnson | Spouse | — | 34 | ~1906 |
Census Appearances
1910
Marion, Iowa
Son, age 5
Marion, Iowa · implied b. ~1905 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Theodore |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Colorado |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Marion, Iowa
Son, age 14
Marion, Iowa · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Theodore |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Colorado |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Marion, Iowa
Head, age 25
Marion, Iowa · implied b. ~1905 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Theodore J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 18 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Colorado |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Mahaska-County, Iowa
Head, age 35
Mahaska-County, Iowa · implied b. ~1905 — 5 household members
| Surname | Johnson |
| Given Name | Theodore T. @ |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Jefferson Twp. |
| 1935 Residence (County) | Mahaska |
| Occupation | Laborer |
| Industry | School Bus |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 500 |
| Highest Grade | Hs 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 Theodore Johnson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Charles Johnson (~0.92 confidence) and father S Johnson (~0.92 confidence) and mother Mabel Johnson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Johnson
b. ~1877
Source father
● Household
· direct · ~0.92
Father
S Johnson
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Mabel Johnson
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Theodore Johnson
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 — Mahaska-County, Iowa
Open full size
1940 US Federal Census — Mahaska-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01180-00179)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert E. Wingender | 4 | Son | — | — |
| 42 | William Wingender | 77 | Head | Retired | Indiana |
| 43 | Elizabeth O. Wingender | 65 | Wife | House Wife | Iowa |
| 44 | Howard C. Wingender | 42 | Son | Unable | Iowa |
| 45 | Theodore T. @ Johnson THIS PERSON | 35 | Head | Laborer | Iowa |
| 46 | Helen I. Johnson | 34 | Wife | House Wife | Iowa |
| 47 | Theodore E. Johnson | 14 | Son | — | Iowa |
| 48 | Delbert D. Johnson | 10 | Son | — | Iowa |
| 49 | Donna D. Johnson | 8 | Daughter | — | Iowa |
| 50 | Charley S. @ Lancaster | 38 | Head | Farmer | Iowa |
| 51 | Ethel Lancaster | 36 | Wife | House Wife | Iowa |
| 52 | Mervin L. Lancaster | 7 | Son | — | Iowa |
| 53 | Clarence C. Dykstra | 27 | Head | Farm Hand | Iowa |
| 54 | Georgia E. Dykstra | 25 | Wife | House Wife | Iowa |
| 55 | Richard E. Dykstra | 3 | Son | — | — |
| 56 | Guffy Johnson | 53 | Head | Farmer | Sweden |
| 57 | Gary Watkins | 40 | Head | Farmer | Iowa |
| 58 | Mildred M. Watkins | 40 | Wife | House Wife | Iowa |
| 59 | Harold E. Watkins | 20 | Son | Farmer | Missouri |
| 60 | Robert L. Watkins | 19 | Son | Farmer | Missouri |
| 61 | Merlin Roorda | 25 | Head | Farmer | Iowa |
| 62 | Josephine Roorda | 23 | Wife | House Wife | Iowa |
| 63 | Jeanne J. Roorda | 0 | Daughter | — | — |
| 64 | John Ver Ploeg | 53 | Head | Farmer | Iowa |
| 65 | Fern H. @ Ver Ploeg | 44 | Wife | House Wife | Iowa |
| 66 | Henry J. Ver Ploeg | 61 | Brother | Farmer | Iowa |
| 67 | Vera Miller | 19 | Lodger | School Teacher | Iowa |
| 68 | Cecil H. Ver Ploeg | 22 | Head | Farmer | Iowa |
| 69 | Mabel Ver Ploeg | 25 | Wife | House Wife | Iowa |
| 70 | John H. Eveland | 47 | Head | Farmer | Iowa |
| 71 | Ruth M. Eveland | 41 | Wife | House Wife | Iowa |
| 72 | John W. Eveland | 19 | Son | Farmer | Iowa |
| 73 | Alice M. Eveland | 17 | Daughter | End April 24 | Iowa |
| 74 | John Heegel | 29 | Head | Farmer | Iowa |
| 75 | Ellen Heegel | 64 | Mother | House Keeper | Iowa |
| 76 | Martha Heegel | 34 | Sister | House Work | Iowa |
| 77 | John Heegel | 26 | Brother | Farmer | Iowa |
| 78 | Raymond Heegel | 21 | Brother | Farmer | Iowa |
| 79 | P. J. Heegel | 18 | Brother | Farmer | Iowa |
| 80 | Elinor Heegel | 16 | Sister | House Work | Iowa |
Pedigree Summary
Theodore
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)