LJ
Lawrence Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lucas-County, Iowa
Our Model Tree links this Lawrence Johnson across the 1910, 1920, 1930 and 1940 US Censuses in Lucas-County, Iowa (XGBoost, ~Confirmed), with identified parents Ellen & Ellen — first a son (b.~1903), then head of a 3-person household.
Age 37
b. ~1903
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lucas-County, Iowa |
| Surname | Johnson |
| Given Name | Lawrence L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | English Township |
| 1935 Residence (County) | Lucas County |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 70 |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | English Township |
| Est. Birth Year | ~1903 |
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 Lawrence | Age | Birth yr |
|---|---|---|---|---|
| Frank Johnson | Head | — | 66 | ~1874 |
| Lawrence Johnson | Son | — | 37 | ~1903 |
| Ellen Johnson | Spouse | — | 66 | ~1874 |
Census Appearances
1910
Lucas, Iowa
Son, age 7
Lucas, Iowa · implied b. ~1903 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Lawrence A |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Sweden |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Lucas, Iowa
Son, age 17
Lucas, Iowa · implied b. ~1903 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Lawrence A |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Sweden |
| Occupation | Farm labor |
| Industry | Home farm |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Lucas, Iowa
Son, age 27
Lucas, Iowa · implied b. ~1903 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Lawrence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Sweden |
| Occupation | Carpenter |
| Industry | Gen House Bldg |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Lucas-County, Iowa
Son, age 37
Lucas-County, Iowa · implied b. ~1903 — 3 household members
| Surname | Johnson |
| Given Name | Lawrence L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | English Township |
| 1935 Residence (County) | Lucas County |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 70 |
| Income (1939) | 0 |
| Highest Grade | No 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 Lawrence Johnson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Ellen Johnson (~0.92 confidence) and mother Ellen Johnson (~0.92 confidence) and father Frank Johnson (~0.92 confidence) and father Samuel Johnson (~0.92 confidence) and mother Ellen Johnson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Ellen Johnson
b. ~1872
Source mother
● Household
· direct · ~0.92
Mother
Ellen Johnson
b. ~1874
Source mother
● Household
· direct · ~0.92
Father
Frank Johnson
b. ~1874
Source father
● Household
· direct · ~0.92
Father
Samuel Johnson
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Ellen Johnson
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Lawrence Johnson
Son · 1940 · age 37 · b. ~1903 · 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-t0627-01178-00584)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Phyllis Johnson | 15 | Daughter | — | Iowa |
| 2 | Frank E. Johnson | 66 | Head | Farmer | Iowa |
| 3 | Ellen L. Johnson | 66 | Wife | — | Sweden |
| 4 | Lawrence L. Johnson THIS PERSON | 37 | Son | Farmer | Iowa |
| 5 | June H. Griffin | 58 | Head | Labor | Iowa |
| 6 | Cora M. Griffin | 58 | Wife | — | Iowa |
| 7 | Gerald G. Griffin | 27 | Son | Farm Hand | Iowa |
| 8 | Wilma G. Griffin | 20 | Daughter | Rural Teacher | Iowa |
| 9 | Albert L. Griffin | 17 | Son | — | Iowa |
| 10 | James H. Carey | 58 | Head | Farmer | Iowa |
| 11 | Mary Carey | 64 | Sister | — | Iowa |
| 12 | Oliver C. Young | 61 | Head | Farm Hand | Iowa |
| 13 | Teddy R. Wilson | 40 | Head | Farmer | Iowa |
| 14 | Artie M. Wilson | 39 | Wife | — | Iowa |
| 15 | Mildred M. Wilson | 15 | Daughter | — | Iowa |
| 16 | Raylene L. Wilson | 12 | Daughter | — | Iowa |
| 17 | George O. Coler | 46 | Head | Farmer | Iowa |
| 18 | Zora L. Coler | 47 | Wife | — | Iowa |
| 19 | Glen B. Coler | 21 | Son | Farmer | Iowa |
| 20 | Norma F. Coler | 16 | Daughter | — | Iowa |
| 21 | Helen P. Coler | 14 | Daughter | — | Iowa |
| 22 | Merrill Baxter | 25 | Head | Farmer | Iowa |
| 23 | Leona Baxter | 24 | Wife | — | Iowa |
| 24 | Remona Baxter | 7 | Daughter | — | Iowa |
| 25 | Barbara Baxter | 3 | Daughter | — | Iowa |
| 26 | R. Benjamin Baxter | 1 | Son | — | Iowa |
| 27 | Carl J. Johnson | 62 | Head | Farmer | Iowa |
| 28 | John W. Jones | 55 | Head | Farmer | Iowa |
| 29 | Dilla M. Jones | 51 | Wife | — | Iowa |
| 30 | Charles E. Mcafee | 67 | Head | Farmer | Iowa |
| 31 | Nellie B. Mcafee | 62 | Wife | — | Iowa |
| 32 | Arthur T. Karn | 28 | Head | Farmer | Iowa |
| 33 | Esther B. Karn | 29 | Wife | — | Iowa |
| 34 | Harold Swanson | 25 | Head | Farmer | Iowa |
| 35 | Wilbur F. Karn | 54 | Head | Farmer | Iowa |
| 36 | Charlotte Karn | 49 | Wife | — | Iowa |
| 37 | William Sumpler | 65 | Head | Farmer | Iowa |
| 38 | Gertrude L. Sumpler | 44 | Wife | — | Iowa |
| 39 | Earl T. Hopkins | 35 | Head | Engineer | Iowa |
| 40 | Verla Hopkins | 31 | Wife | — | Iowa |
Pedigree Summary
Lawrence
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)