JC
John Campbell — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mclean-County, Illinois
Our Model Tree links this John Campbell across the 1920, 1930 and 1940 US Censuses in Mclean-County, Illinois (XGBoost, ~Confirmed), with identified parents Hugh & S — first a head (b.~1912), then head of a 5-person household.
Age 28
b. ~1912
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mclean-County, Illinois |
| Surname | Campbell |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Old Town Township |
| 1935 Residence (County) | McLean |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farmer |
| Township / Ward | Old Town Township |
| Est. Birth Year | ~1912 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Kay Campbell | Daughter | — | 1 | ~1939 |
| John Campbell | Head | — | 28 | ~1912 |
| Elton Smiley | Other | — | 19 | ~1921 |
| Keith Campbell | Son | — | 3 | ~1937 |
| Dorothy Campbell | Spouse | — | 26 | ~1914 |
Census Appearances
1920
Mclean, Illinois
Son, age 8
Mclean, Illinois · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Mclean, Illinois
Son, age 18
Mclean, Illinois · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Mclean-County, Illinois
Head, age 28
Mclean-County, Illinois · implied b. ~1912 — 5 household members
| Surname | Campbell |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Old Town Township |
| 1935 Residence (County) | McLean |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Campbell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Hugh Campbell (~0.92 confidence) and father S Campbell (~0.92 confidence) and mother Ella Campbell (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Hugh Campbell
b. ~1889
Source father
● Household
· direct · ~0.92
Father
S Campbell
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Ella Campbell
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Campbell
Head · 1940 · age 28 · b. ~1912 · Illinois
★ 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 — Mclean-County, Illinois
Open full size
1940 US Federal Census — Mclean-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00842-00862)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | George P. Frink | 73 | Head | Farmer | New York |
| 2 | Clara M. Frink | 75 | Wife | — | Ohio |
| 3 | Robert E. Ward | 66 | Head | Farm Laborer | Kentucky |
| 4 | Elliot Baylor | 67 | Head | Farmer | Illinois |
| 5 | Florence Baylor | 73 | Sister | — | Illinois |
| 6 | Ora Baylor | 64 | Sister | — | Illinois |
| 7 | Harold Dunlap | 23 | Head | Farm Laborer | Illinois |
| 8 | Lula Dunlap | 20 | Wife | — | Illinois |
| 9 | H. M. Scott | 64 | Head | Farm Labor | Virginia |
| 10 | John Campbell THIS PERSON | 28 | Head | Farmer | Illinois |
| 11 | Dorothy Campbell | 26 | Wife | — | Illinois |
| 12 | Keith Campbell | 3 | Son | — | Illinois |
| 13 | Kay Campbell | 1 | Daughter | — | Illinois |
| 14 | Elton Smiley | 19 | Cousin | Farm Laborer | Illinois |
| 15 | Vernon Hanover | 50 | Head | Farmer | Illinois |
| 16 | Margaret Hanover | 46 | Wife | — | Kentucky |
| 17 | Janet Hanover | 11 | Daughter | — | Illinois |
| 18 | John Howes | 47 | Head | Farmer | Illinois |
| 19 | Mildred Howes | 40 | Wife | — | Illinois |
| 20 | Earl Hanover | 31 | Head | Farmer And Laborer | Illinois |
| 21 | Elizabeth Hanover | 20 | Wife | — | Illinois |
| 22 | Delores Hanover | 2 | Daughter | — | Illinois |
| 23 | Howard Layton | 49 | Head | Farmer | Illinois |
| 24 | Dale Layton | 44 | Wife | — | Illinois |
| 25 | Glenn Layton | 21 | Son | Farmer | Illinois |
| 26 | Lee Layton | 15 | Son | — | Illinois |
| 27 | Frank Hanover | 55 | Head | Farmer | Illinois |
| 28 | Nannie Hanover | 55 | Wife | — | Illinois |
| 29 | Raymond Hanover | 26 | Son | Farmer | Illinois |
| 30 | Harry Howes | 60 | Head | Farmer | Illinois |
| 31 | Walter Howes | 31 | Son | Farmer | Illinois |
| 32 | Raymond Howes | 19 | Son | — | Illinois |
| 33 | Warren Howes | 18 | Son | — | Illinois |
| 34 | Dora Fleischer | 52 | Head | — | Tennessee |
| 35 | Carl Fleischer | 24 | Son | Farmer | Illinois |
| 36 | Emma Fleischer | 19 | Daughter | — | Illinois |
| 37 | Lloyd Fleischer | 16 | Son | — | Illinois |
| 38 | Floyd Fleischer | 15 | Son | — | Illinois |
| 39 | Charles A. Krieg | 44 | Head | Farm Laborer | Illinois |
| 40 | Elsa Krieg | 44 | Wife | — | W. Virginia |
Pedigree Summary
John
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)