JC
John Cowan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Missouri
Our Model Tree links this John Cowan across the 1930 and 1940 US Censuses in Polk-County, Missouri (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 6-person household.
Age 17
b. ~1923
Male
Son
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Missouri |
| Surname | Cowan |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Union Township |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | Union Township |
| Est. Birth Year | ~1923 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Margaret Cowan | Daughter | — | 15 | ~1925 |
| John Cowan | Son | — | 17 | ~1923 |
| Mary Cowan | Spouse | — | 53 | ~1887 |
| Albert Cowan | Son | — | 19 | ~1921 |
| Calvyn Cowan | Son | — | 12 | ~1928 |
| Albert Cowan | Head | — | 63 | ~1877 |
Census Appearances
1930
Polk, Missouri
Son, age 5
Polk, Missouri · implied b. ~1925 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cowan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
Polk-County, Missouri
Son, age 17
Polk-County, Missouri · implied b. ~1923 — 6 household members
| Surname | Cowan |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Union Township |
| 1935 Residence (County) | Polk |
| Class of Worker | 0 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 Cowan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cowan
Son · 1940 · age 17 · b. ~1923 · Missouri
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Sibling
Albert Cowan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Cowan
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Calvyn Cowan
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Polk-County, Missouri
Open full size
1940 US Federal Census — Polk-County, Missouri
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02141-00898)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frank F. Lyman | 12 | son | — | Missouri |
| 2 | Wanda Lyman | 9 | daughter | — | Missouri |
| 3 | Annie G. Owens | 22 | head | — | Missouri |
| 4 | Kimble Hawkins | 24 | son in law | Farming | Missouri |
| 5 | Opal D. Hawkins | 37 | daughter | — | Missouri |
| 6 | Clara Bell Hawkins | 4 | granddaughter | — | Missouri |
| 7 | Iley D. Rowan | 45 | head | Farming | Missouri |
| 8 | Mardie Rowan | 42 | wife | — | Missouri |
| 9 | Elden Rowan | 16 | son | — | Missouri |
| 10 | Graceanna Rowan | 12 | daughter | — | Missouri |
| 11 | Sam Davis | 53 | head | Farming | Missouri |
| 12 | Iory D. Davis | 51 | wife | — | Missouri |
| 13 | James C. Buchanan | 65 | head | Farming | Missouri |
| 14 | Emma R. Buchanan | 51 | wife | — | Missouri |
| 15 | Albert D. Shuler | 61 | head | Farming | Indiana |
| 16 | Ellie Shuler | 52 | wife | — | Missouri |
| 17 | Albert D. Cowan | 63 | head | Farming | Missouri |
| 18 | Mary E. Cowan | 53 | wife | — | Missouri |
| 19 | Albert G. Cowan | 19 | son | — | Missouri |
| 20 | John Cowan THIS PERSON | 17 | son | — | Missouri |
| 21 | Margaret Cowan | 15 | daughter | — | Missouri |
| 22 | Calvyn Cowan | 12 | son | — | Missouri |
| 23 | Billie D. Cowan | 60 | head | — | Missouri |
| 24 | Mattie S. Cowan | 62 | wife | — | Missouri |
| 25 | James R. Buck | 20 | son-in-law | Farming | Missouri |
| 26 | Billie Buck | 21 | daughter | Teaching | Missouri |
| 27 | Earl D. Sharp | 41 | head | Farming | Missouri |
| 28 | Dollie Sharp | 37 | wife | — | Missouri |
| 29 | Leonard Sharp | 12 | son | — | Missouri |
| 30 | Albert S. Dickerson | 67 | head | Farming | Missouri |
| 31 | Sarah C. Dickerson | 67 | wife | — | Missouri |
| 32 | Joseph G. Doffins | 36 | son-in-law | Farming | Missouri |
| 33 | Mary Doffins | 35 | daughter | — | Missouri |
| 34 | Marilyn Doffins | 4 | granddaughter | — | Missouri |
| 35 | Dean Tygart | 50 | head | Farming | Missouri |
| 36 | Madge Tygart | 45 | wife | — | Missouri |
| 37 | Norwood Tygart | 19 | son | Farming | Missouri |
| 38 | Ray D. Davis | 45 | head | Farming | Missouri |
| 39 | Joan Davis | 75 | mother | — | Missouri |
| 40 | Paul Davis | 34 | brother | Laborer | Missouri |
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)