JH
John Harmon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mcdonough-County, Illinois
Our Model Tree links this John Harmon across the 1920, 1930 and 1940 US Censuses in Mcdonough-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1872), then head of a 3-person household.
Age 68
b. ~1872
Male
Head
Born: Illinois
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Mcdonough-County, Illinois |
| Surname | Harmon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 68 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| 1935 Residence (County) | McDonough |
| Additional Details | |
| Occupation | Farming |
| Industry | Agriculture |
| Class of Worker | OA |
| Hours Worked | 52 |
| Income (1939) | 0 |
| Highest Grade | G 8 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farming |
| Township / Ward | Macomb Township |
| Est. Birth Year | ~1872 |
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 Harmon | Head | — | 68 | ~1872 |
| George Henry | Other | — | 72 | ~1868 |
| Ray Harmon | Son | — | 39 | ~1901 |
Census Appearances
1920
Mcdonough, Illinois
Head, age 47
Mcdonough, Illinois · implied b. ~1873 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harmon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | Emp |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Mcdonough, Illinois
Other, age 59
Mcdonough, Illinois · implied b. ~1871 — 14 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harmon |
| Given Name | John H |
| Relationship to Head | O |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 22 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | O |
| Can Read/Write | Yes |
| Radio Set | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Mcdonough-County, Illinois
Head, age 68
Mcdonough-County, Illinois · implied b. ~1872 — 3 household members
| Surname | Harmon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 68 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| 1935 Residence (County) | McDonough |
| Occupation | Farming |
| Industry | Agriculture |
| Class of Worker | OA |
| Hours Worked | 52 |
| Income (1939) | 0 |
| Highest Grade | G 8 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Harmon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Harmon
Head · 1940 · age 68 · b. ~1872 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Mcdonough-County, Illinois
Open full size
1940 US Federal Census — Mcdonough-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00839-00363)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Donald Tomlinson | 13 | Son | — | Illinois |
| 2 | Richard Tomlinson | 9 | Son | — | Illinois |
| 3 | Rex Belshaw | 38 | Head | Farming | Illinois |
| 4 | Gertie Belshaw | 38 | Wife | — | Kentucky |
| 5 | Robert Belshaw | 7 | Son | — | Illinois |
| 6 | Dean Belshaw | 5 | Son | — | Illinois |
| 7 | Donel Belshaw | 5 | Son | — | Illinois |
| 8 | Maurice Hite | 24 | Hired man | Hired Man | Illinois |
| 9 | George W. Sadler | 53 | Head | Farming | Kentucky |
| 10 | Anna Sadler | 52 | Wife | — | Missouri |
| 11 | Charles A. Vingerich | 66 | Head | Farming | Pennsylvania |
| 12 | Mary D. Vingerich | 64 | Wife | — | Illinois |
| 13 | Clifford L. Crickett | 53 | Head | Farming | Kansas |
| 14 | Florence M. Crickett | 50 | Wife | — | Illinois |
| 15 | William B. Vonderbark | 54 | Head | Farming | Illinois |
| 16 | Clara Vonderbark | 57 | Wife | — | Illinois |
| 17 | Hattie J. Krabb | 70 | Head | — | Illinois |
| 18 | Chester A. Krabb | 35 | Son | Farming | Illinois |
| 19 | Eleanor Krabb | 32 | Daughter | — | Illinois |
| 20 | Joseph Randolph | 76 | Brother | — | Illinois |
| 21 | John Harmon THIS PERSON | 68 | Head | Farming | Illinois |
| 22 | Ray Harmon | 39 | Son | Farming | Illinois |
| 23 | George W. Henry | 72 | Lodger | Farming | Illinois |
| 24 | Oscar Danielson | 40 | Head | Farming | Illinois |
| 25 | Ola L. Danielson | 31 | Wife | — | Illinois |
| 26 | Roscoe Ellis | 42 | Head | Farming | Illinois |
| 27 | Lillian Ellis | 42 | Wife | — | Illinois |
| 28 | James R. Ellis | 14 | Son | — | Illinois |
| 29 | John W. Ellis | 14 | Son | — | Illinois |
| 30 | Arthur N. Gardner | 61 | Head | Farming | Illinois |
| 31 | Edna Gardner | 60 | Wife | — | Illinois |
| 32 | George L. Simms | 23 | Head | Hired Man | Illinois |
| 33 | Margaret Simms | 20 | Wife | — | Illinois |
| 34 | Sterling Simms | 1 | Son | — | Illinois |
| 35 | Joseph Button | 24 | Head | Carpenter | Illinois |
| 36 | Ruby Button | 25 | Wife | — | Kentucky |
| 37 | Bonnie Lee Button | 2 | Daughter | — | Illinois |
| 38 | Carol June Button | 0 | Daughter | — | Illinois |
| 39 | Fred Bailey | 58 | Head | Finisher | Illinois |
| 40 | Lucy Bailey | 53 | Wife | — | Illinois |
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)