WC
William Cochran — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Grundy-County, Illinois
Our Model Tree links this William Cochran across the 1930 and 1940 US Censuses in Grundy-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 8-person household.
Age 11
b. ~1929
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Grundy-County, Illinois |
| Surname | Cochran |
| Given Name | William E |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Morris city |
| 1935 Residence (County) | Grundy |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Morris City |
| Est. Birth Year | ~1929 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Marilyn Cochran | Daughter | — | 13 | ~1927 |
| Betty Cochran | Daughter | — | 7 | ~1933 |
| Edward Cochran | Head | — | 31 | ~1909 |
| Jack Cochran | Son | — | 9 | ~1931 |
| Harold Cochran | Son | — | 8 | ~1932 |
| William Cochran | Son | — | 11 | ~1929 |
| Gerald Cochran | Son | — | 6 | ~1934 |
| Lillian Cochran | Spouse | — | 30 | ~1910 |
Census Appearances
1930
Grundy, Illinois
Other, age
Grundy, Illinois · implied b. ~1930 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cochran |
| Given Name | William |
| Relationship to Head | grand-son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Grundy-County, Illinois
Son, age 11
Grundy-County, Illinois · implied b. ~1929 — 8 household members
| Surname | Cochran |
| Given Name | William E |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Morris city |
| 1935 Residence (County) | Grundy |
| Class of Worker | 0 |
| Highest Grade | No 4 |
| 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 William Cochran across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Cochran
Son · 1940 · age 11 · b. ~1929 · Illinois
★ You are viewing this record
Sibling
Betty Cochran
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jack Cochran
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marilyn Cochran
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gerald Cochran
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Cochran
Sibling · 1940 · age 8
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 — Grundy-County, Illinois
Open full size
1940 US Federal Census — Grundy-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00809-00423)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles Becca | 27 | head | Feeder | Illinois |
| 2 | Alma, M Becca | 24 | wife | — | Illinois |
| 3 | Anna, M Vacco | 42 | head | — | Illinois |
| 4 | Wilbert Vacco | 10 | son | — | Illinois |
| 5 | Morgan Charles Vacco | 56 | brother | — | England |
| 6 | Richard Bishop | 70 | head | — | England |
| 7 | Christen Detra | 44 | head | School Teacher | Illinois |
| 8 | Stella, L Detra | 42 | sister | Nurse | Illinois |
| 9 | Peter Hupke | 52 | head | Laborer | Russia Poland |
| 10 | Tresa Hupke | 49 | wife | — | Russia Poland |
| 11 | George R Hupke | 20 | son | Truck Driver | Illinois |
| 12 | Julia H Hupke | 17 | daughter | Waitress | Illinois |
| 13 | Constance, B Hupke | 16 | daughter | — | Illinois |
| 14 | Victor S Hupke | 14 | son | — | Illinois |
| 15 | Joseph, P Hupke | 12 | son | — | Illinois |
| 16 | Stanley E Hupke | 10 | son | — | Illinois |
| 17 | Marie Hupke | 8 | daughter | — | Illinois |
| 18 | John Hupke | 8 | son | — | Illinois |
| 19 | Rose Anne, D Hupke | 3 | daughter | — | Illinois |
| 20 | Ray J Matthews | 47 | head | Attendant | Illinois |
| 21 | Rachel Matthews | 45 | wife | — | Canada |
| 22 | Alma Matthews | 28 | daughter | — | Illinois |
| 23 | Reva Matthews | 26 | son | Attendant | Illinois |
| 24 | James Ray | 80 | head | Watchman | Illinois |
| 25 | William A Ray | 53 | son | — | Illinois |
| 26 | Bernal Peterson | 35 | head | Printer | Illinois |
| 27 | Margery J Peterson | 31 | wife | — | Illinois |
| 28 | Marilyn J Peterson | 11 | daughter | — | Illinois |
| 29 | Pierre L Peterson | 2 | son | — | Illinois |
| 30 | Margrett Hellman | 75 | head | — | Illinois |
| 31 | Arthur, H Hellman | 45 | son | Laborer | Illinois |
| 32 | Amada R Hellman | 44 | daughter | Domestic Work | Indiana |
| 33 | Edward R Cochran | 31 | head | Truck Driver | Missouri |
| 34 | Lillian, I Cochran | 30 | wife | — | Illinois |
| 35 | Marilyn S Cochran | 13 | daughter | — | Illinois |
| 36 | William E Cochran THIS PERSON | 11 | son | — | Illinois |
| 37 | Jack, R Cochran | 9 | son | — | Illinois |
| 38 | Harold G Cochran | 8 | son | — | Illinois |
| 39 | Betty J Cochran | 7 | daughter | — | Illinois |
| 40 | Gerald N Cochran | 6 | son | — | 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)