JL
James Leonard — 1940 US Census Record
Model Tree available1940 United States Federal Census · Jasper-County, Iowa
Our Model Tree links this James Leonard across the 1920, 1930 and 1940 US Censuses in Jasper-County, Iowa (XGBoost, ~Confirmed), with identified parents Mary & Thomas — first a head (b.~1914), then head of a 3-person household.
Age 26
b. ~1914
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Jasper-County, Iowa |
| Surname | Leonard |
| Given Name | James O |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Newton Township |
| 1935 Residence (County) | Jasper |
| Additional Details | |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 70 |
| Income (1939) | 480 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Laborer |
| Township / Ward | Newton Township |
| Est. Birth Year | ~1914 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| James Leonard | Head | — | 26 | ~1914 |
| Melvin Leonard | Son | — | ~1940 | |
| Lela Leonard | Spouse | — | 22 | ~1918 |
Census Appearances
1920
Jasper, Iowa
Son, age 6
Jasper, Iowa · implied b. ~1914 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Jasper, Iowa
Son, age 16
Jasper, Iowa · implied b. ~1914 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | James O. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Farm Laborer |
| Industry | Gen. Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Jasper-County, Iowa
Head, age 26
Jasper-County, Iowa · implied b. ~1914 — 3 household members
| Surname | Leonard |
| Given Name | James O |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Newton Township |
| 1935 Residence (County) | Jasper |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 70 |
| Income (1939) | 480 |
| Highest Grade | H 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 James Leonard across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Leonard (~0.92 confidence) and father Thomas Leonard (~0.92 confidence) and father Thomas Leonard (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Leonard
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
Thomas Leonard
b. ~1889
Source father
● Household
· direct · ~0.92
Father
Thomas Leonard
b. ~1889
Source father
● Household
· direct · ~0.92
This person
Anchor record
James Leonard
Head · 1940 · age 26 · b. ~1914 · 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 — Jasper-County, Iowa
Open full size
1940 US Federal Census — Jasper-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01169-00741)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Darwin R Black | 66 | Head | Salesman | Kentucky |
| 2 | Julia A Black | 66 | Wife | — | Iowa |
| 3 | Elliott P Taylor | 34 | Son-in-law | — | Illinois |
| 4 | James O Leonard THIS PERSON | 26 | Head | Laborer | Iowa |
| 5 | Lela M Leonard | 22 | Wife | — | Iowa |
| 6 | Melvin L Leonard | 0 | Son | — | Iowa |
| 7 | Charles A Smith | 49 | Head | Laborer | Iowa |
| 8 | Agnes Smith | 37 | Wife | — | Iowa |
| 9 | C Wayne Smith | 18 | Son | Laborer | Iowa |
| 10 | Lawrence R Smith | 17 | Son | Laborer | Iowa |
| 11 | Helen M Smith | 16 | Daughter | Maid | Iowa |
| 12 | Iris I Smith | 14 | Daughter | — | Iowa |
| 13 | Hugh T Smith | 12 | Son | — | Iowa |
| 14 | William T Smith | 10 | Son | — | Iowa |
| 15 | Chris E Smith | 7 | Son | — | Iowa |
| 16 | Denis D Smith | 5 | Son | — | Iowa |
| 17 | James A Smith | 2 | Son | — | Iowa |
| 18 | Russel J Jackson | 40 | Head | Assembler | Iowa |
| 19 | Louise Jackson | 33 | Wife | — | Iowa |
| 20 | Clifford R Jackson | 12 | Son | — | Iowa |
| 21 | Lucille L Jackson | 7 | Daughter | — | Iowa |
| 22 | Loren F Altemeier | 33 | Head | Farmer | Iowa |
| 23 | Eleanor Altemeier | 27 | Wife | — | Iowa |
| 24 | Marjorie L Altemeier | 3 | Daughter | — | Iowa |
| 25 | Richard D Altemeier | 1 | Son | — | Iowa |
| 26 | Fred Tiedje | 61 | Head | Farmer | Iowa |
| 27 | Maggie Tiedje | 61 | Wife | — | Iowa |
| 28 | Emerson E Morgan | 41 | Head | Farmer | Iowa |
| 29 | Vera E Morgan | 40 | Wife | — | Iowa |
| 30 | Louise J Morgan | 17 | Daughter | — | Iowa |
| 31 | Raymond O Morgan | 15 | Son | — | Iowa |
| 32 | Hollis L Morgan | 13 | Son | — | Iowa |
| 33 | Shirley L Morgan | 11 | Daughter | — | Iowa |
| 34 | Ed Wehrman | 69 | Head | Farmer | Iowa |
| 35 | Sophia Wehrman | 60 | Wife | — | Iowa |
| 36 | Maud Lake | 50 | Head | — | Iowa |
| 37 | Mary E Robertson | 80 | Mother | — | Iowa |
| 38 | Howard Gunsalus | 28 | Head | Grinder | Iowa |
| 39 | Martha Gunsalus | 27 | Wife | — | Iowa |
| 40 | John H Gunsalus | 5 | Son | — | Iowa |
Pedigree Summary
James
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)