MJ
Martha Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Wapello-County, Iowa
Our Model Tree links this Martha Johnson across the 1920, 1930 and 1940 US Censuses in Wapello-County, Iowa (XGBoost, ~Confirmed), with identified parents Herbert & Edward — first a daughter (b.~1919), then head of a 6-person household.
Age 21
b. ~1919
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Wapello-County, Iowa |
| Surname | Johnson |
| Given Name | Martha |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Ottumwa |
| 1935 Residence (County) | Wapello County |
| Additional Details | |
| Occupation | Office Work |
| Industry | Garage |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 480 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Office Work |
| Township / Ward | Ottumwa |
| Est. Birth Year | ~1919 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Martha | Age | Birth yr |
|---|---|---|---|---|
| Patty Johnson | Daughter | — | 3 | ~1937 |
| Martha Johnson | Daughter | — | 21 | ~1919 |
| Edward Johnson | Head | — | 54 | ~1886 |
| Arthur Johnson | Son | — | 27 | ~1913 |
| Robert Johnson | Son | — | 15 | ~1925 |
| Ester Johnson | Spouse | — | 53 | ~1887 |
Census Appearances
1920
Wapello, Iowa
Daughter, age 1
Wapello, Iowa · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Martha |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | England |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Wapello, Iowa
Daughter, age 11
Wapello, Iowa · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Martha A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | England |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Wapello-County, Iowa
Daughter, age 21
Wapello-County, Iowa · implied b. ~1919 — 6 household members
| Surname | Johnson |
| Given Name | Martha |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Ottumwa |
| 1935 Residence (County) | Wapello County |
| Occupation | Office Work |
| Industry | Garage |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 480 |
| Highest Grade | H-4 |
| 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 Martha Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Herbert Johnson (~0.92 confidence) and father Edward Johnson (~0.92 confidence) and mother Ester Johnson (~0.92 confidence) and mother Esther Johnson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Herbert Johnson
b. ~1886
Source father
● Household
· direct · ~0.92
Father
Edward Johnson
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Ester Johnson
b. ~1887
Source mother
● Household
· direct · ~0.92
Mother
Esther Johnson
b. ~1898
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Martha Johnson
Daughter · 1940 · age 21 · b. ~1919 · Iowa
★ You are viewing this record
Sibling
Patty Johnson
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Johnson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Johnson
Sibling · 1940 · age 27
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 — Wapello-County, Iowa
Open full size
1940 US Federal Census — Wapello-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01209-00832)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Leona Clewell | 32 | Wife | — | Iowa |
| 42 | Dwight Runnells | 11 | Son | — | Illinois |
| 43 | Richard Ekwall | 5 | Son | — | Iowa |
| 44 | William Nehmeyer | 41 | Head | Manager | Missouri |
| 45 | Doris Nehmeyer | 39 | Wife | — | Illinois |
| 46 | William Nehmeyer | 15 | Son | — | Iowa |
| 47 | James Nehmeyer | 12 | Son | — | Iowa |
| 48 | Marcella Franklin | 19 | Lodger | New Worker | Illinois |
| 49 | Gerald Loerke | 39 | Head | Doctor | Nebraska |
| 50 | Betty Loerke | 40 | Wife | — | Iowa |
| 51 | Betty Jean Loerke | 14 | Daughter | — | Iowa |
| 52 | Robert Loerke | 13 | Son | — | Iowa |
| 53 | Shirley Loerke | 6 | Daughter | — | Iowa |
| 54 | Max Allen | 30 | Head | Clerk | Iowa |
| 55 | Mary Helen Allen | 26 | Wife | — | Missouri |
| 56 | Lora Galey | 53 | Head | Teacher | Iowa |
| 57 | Hugh Galey | 88 | Father | — | Indiana |
| 58 | Grover Galey | 55 | Brother | Fireman | Iowa |
| 59 | Madeline Shank | 19 | Lodger | 3 | Iowa |
| 60 | Robert Fulton | 33 | Head | 40 | Iowa |
| 61 | Jeannette Fulton | 26 | Wife | — | Iowa |
| 62 | Martin Johnson | 60 | Head | Baggageman | Illinois |
| 63 | Gary Johnson | 57 | Wife | — | Iowa |
| 64 | Ada Johnson | 26 | Daughter | Teacher | Iowa |
| 65 | James Johnson | 18 | Son | Delivery Boy | Iowa |
| 66 | Edward Johnson | 54 | Head | Laborer | Iowa |
| 67 | Ester Johnson | 53 | Wife | — | England |
| 68 | Martha Johnson THIS PERSON | 21 | Daughter | Office Work | Iowa |
| 69 | Robert Johnson | 15 | Son | — | Iowa |
| 70 | Arthur Johnson | 27 | Son | Office Work | Iowa |
| 71 | Patty Johnson | 3 | Daughter | — | Iowa |
| 72 | Arthur Doyle | 54 | Head | Switchman | Kansas |
| 73 | Eva Doyle | 58 | Wife | — | Iowa |
| 74 | Lars L. Hunter | 59 | Head | Salesman | Iowa |
| 75 | Austa Hunter | 61 | Wife | — | Iowa |
| 76 | Thelma Hunter | 35 | Daughter | Teacher | Iowa |
| 77 | Rosella Owen | 80 | Aunt | — | Iowa |
| 78 | Ruth Preister | 27 | Head | — | Iowa |
| 79 | Robert Preister | 7 | Son | — | Iowa |
| 80 | Richard Preister | 5 | Son | — | Iowa |
Pedigree Summary
Martha + 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)