JH
John Hardin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Hardin across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1916), then head of a 8-person household.
Age 24
b. ~1916
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Hardin |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Oak Park |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Typesetter |
| Industry | Printing Shop |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1300 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Typesetter |
| Township / Ward | Oak Park |
| Est. Birth Year | ~1916 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Robert Hardin | Son | — | 13 | ~1927 |
| Mary Hardin | Daughter | — | 8 | ~1932 |
| John Hardin | Head | — | 47 | ~1893 |
| John Hardin | Son | — | 24 | ~1916 |
| D Hardin | Daughter | — | 16 | ~1924 |
| Eugene Hardin | Son | — | 6 | ~1934 |
| G Hardin | Spouse | — | 43 | ~1897 |
| Gloria Hardin | Daughter | — | 10 | ~1930 |
Census Appearances
1930
Cook, Illinois
Other, age 14
Cook, Illinois · implied b. ~1916 — 50 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hardin |
| Given Name | John |
| Relationship to Head | Pupil |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Unknown |
| Mother's Birthplace | Unknown |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 24
Cook-County, Illinois · implied b. ~1916 — 8 household members
| Surname | Hardin |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Oak Park |
| 1935 Residence (County) | Cook |
| Occupation | Typesetter |
| Industry | Printing Shop |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1300 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| 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 Hardin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Hardin
Son · 1940 · age 24 · b. ~1916 · Illinois
★ You are viewing this record
Sibling
D Hardin
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene Hardin
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gloria Hardin
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Hardin
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Hardin
Sibling · 1940 · age 13
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00786-00073)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Francis A. Morse | 11 | Son | — | Illinois |
| 42 | Charles P. Morse | 9 | Son | — | Illinois |
| 43 | Nicholas Beringer | 66 | Lodger | — | Luxemburg |
| 44 | Anna Kelly | 62 | Head | — | Illinois |
| 45 | Edward E. Kelly | 35 | Son | Mechanic | Illinois |
| 46 | Arthur R. Kelly | 32 | Son | Messenger | Illinois |
| 47 | John F. Hardin | 47 | Head | Supervisor | Illinois |
| 48 | G. Jeannette Hardin | 43 | Wife | — | Illinois |
| 49 | John M. Hardin THIS PERSON | 24 | Son | Typesetter | Illinois |
| 50 | D. Patricia Hardin | 16 | Daughter | — | Illinois |
| 51 | Robert E. Hardin | 13 | Son | — | Illinois |
| 52 | Gloria T. Hardin | 10 | Daughter | — | Illinois |
| 53 | Mary H. Hardin | 8 | Daughter | — | Illinois |
| 54 | Eugene G. Hardin | 6 | Son | — | Illinois |
| 55 | Joseph H. Kenning | 41 | Head | Acetylene Welder | England |
| 56 | Opal Kenning | 40 | Wife | — | Illinois |
| 57 | Thomas D. Tighe | 26 | Son-in-law | Chauffeur | Illinois |
| 58 | Norma J. Tighe | 19 | Daughter | — | Illinois |
| 59 | Nancy J. Tighe | 0 | Granddaughter | — | Illinois |
| 60 | Arthur M. Sullivan | 51 | Head | Maintenance Mechanic | Illinois |
| 61 | Hazel E. Sullivan | 47 | Wife | — | Illinois |
| 62 | Arthur M. Jr. Sullivan | 21 | Son | — | Illinois |
| 63 | Dorothy H. Sullivan | 18 | Daughter | Filing Clerk | Illinois |
| 64 | Kenneth J. Sullivan | 15 | Son | — | Illinois |
| 65 | John Ziegler | 44 | Head | Traveling Salesman | Illinois |
| 66 | Dorothy L. Ziegler | 32 | Wife | — | Illinois |
| 67 | Shirley Ann Ziegler | 10 | Daughter | — | Illinois |
| 68 | Barbara J. Ziegler | 8 | Daughter | — | Illinois |
| 70 | Arville U. Ellen | 31 | Head | Maintenance Engineer | Illinois |
| 71 | Henrietta Ellen | 30 | Wife | — | Pennsylvania |
| 72 | Naoma G. Ellen | 4 | Daughter | — | Pennsylvania |
| 73 | Shirley A. Ellen | 1 | Daughter | — | Illinois |
| 74 | Theoduld J. Melancon | 25 | Lodger | Maintenance Engineer | Louisiana |
| 75 | Thomas J. Cordes | 45 | Head | Cashier | Illinois |
| 76 | Margaret M. Cordes | 44 | Wife | Sales Clerk | Illinois |
| 77 | Nathan Hoffman | 48 | Head | Maintenance Engineer | Illinois |
| 78 | Harriet Hoffman | 39 | Wife | — | Illinois |
| 79 | Norman Hoffman | 13 | Son | — | Illinois |
| 80 | Harold Hoffman | 11 | 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)