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John Johnston — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lucas-County, Iowa
Our Model Tree links this John Johnston across the 1910, 1920, 1930 and 1940 US Censuses in Lucas-County, Iowa (XGBoost, ~Confirmed), with identified parents John & Louise — first a head (b.~1906), then head of a 3-person household.
Age 34
b. ~1906
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Lucas-County, Iowa |
| Surname | Johnston |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Lincoln Township |
| 1935 Residence (County) | Lucas |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Lincoln Township |
| Est. Birth Year | ~1906 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Johnston | Head | — | 34 | ~1906 |
| John Johnston | Son | — | 9 | ~1931 |
| Madge Johnston | Spouse | — | 29 | ~1911 |
Census Appearances
1910
Lucas, Iowa
Other, age 4
Lucas, Iowa · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | John D. |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Lucas, Iowa
Son, age 14
Lucas, Iowa · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | John L |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Lucas, Iowa
Son, age 24
Lucas, Iowa · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | John L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 24 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Iowa |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Lucas-County, Iowa
Head, age 34
Lucas-County, Iowa · implied b. ~1906 — 3 household members
| Surname | Johnston |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Lincoln Township |
| 1935 Residence (County) | Lucas |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 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 Johnston across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Johnston (~0.92 confidence) and mother Louise Johnston (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Johnston
b. ~1864
Source father
● Household
· direct · ~0.92
Mother
Louise Johnston
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Johnston
Head · 1940 · age 34 · b. ~1906 · 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 — Lucas-County, Iowa
Open full size
1940 US Federal Census — Lucas-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01178-00641)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Betty L. Shores | 5 | Daughter | — | Iowa |
| 42 | Orville Mason | 33 | Lodger | Farm Laborer | Iowa |
| 43 | Carl A. Mason | 57 | Head | Farmer | Iowa |
| 44 | Nellie M. Mason | 57 | Wife | — | Iowa |
| 45 | Mildred M. Mason | 18 | Daughter | — | Minnesota |
| 46 | Dorothy Mason | 16 | Daughter | New Worker | Minnesota |
| 47 | Thomas E. Mason | 13 | Son | — | Minnesota |
| 48 | Carl F. Erickson | 70 | Head | Farmer | Sweden |
| 49 | Wesley Moore | 70 | Head | Farmer | Iowa |
| 50 | Daisy Moore | 68 | Wife | — | Iowa |
| 51 | Daniel Bingaman | 69 | Head | Farmer | Iowa |
| 52 | Francis Bingaman | 53 | Wife | — | Iowa |
| 53 | Robert Roush | 39 | Lodger | Farm Laborer | Iowa |
| 54 | Daniel Myrick | 39 | Lodger | Farm Laborer | Iowa |
| 55 | John Amos | 38 | Head | Farmer | Iowa |
| 56 | Joan Amos | 10 | Daughter | — | Iowa |
| 57 | John W. Elder | 60 | Head | Farmer | Iowa |
| 58 | Bertha Elder | 54 | Wife | — | Iowa |
| 59 | Elmer B. Lafavre | 55 | Head | Farmer | Iowa |
| 60 | Emma E. Lafavre | 45 | Wife | — | Iowa |
| 61 | Orval O. Shore | 63 | Head | Farmer | Iowa |
| 62 | Lura E. Shore | 63 | Wife | — | Iowa |
| 63 | Clinton Morrison | 31 | Head | Farmer | Iowa |
| 64 | Nina I. Morrison | 31 | Wife | — | Iowa |
| 65 | Virginia Morrison | 10 | Daughter | — | Iowa |
| 66 | Geraldine Morrison | 6 | Daughter | — | Iowa |
| 67 | Louis Bishop | 41 | Head | Farm Laborer | Iowa |
| 68 | Clayton Oxenreider | 33 | Head | Farmer | Iowa |
| 69 | Mary C. Oxenreider | 24 | Wife | — | Iowa |
| 70 | Clyde W. Oxenreider | 5 | Son | — | Iowa |
| 71 | John A. Johnston | 76 | Head | — | Sweden |
| 72 | Louise Johnston | 68 | Wife | — | Iowa |
| 73 | Donald Johnston | 28 | Son | Farmer | Iowa |
| 74 | John L. Johnston THIS PERSON | 34 | Head | Farmer | Iowa |
| 75 | Madge E. Johnston | 29 | Wife | — | Iowa |
| 76 | John R. Johnston | 9 | Son | — | Iowa |
| 77 | Bruce C. Prior | 56 | Head | Farmer | Ohio |
| 78 | Florence Prior | 56 | Wife | — | Iowa |
| 79 | John Peterson | 58 | Lodger | Farm Laborer | Iowa |
| 80 | Matthew Johnston | 38 | Head | Farmer | Iowa |
Pedigree Summary
John
Gen 1 · 2 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)