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John Mayer — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Mayer across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1865), then head of a 2-person household.
Age 75
b. ~1865
Male
Head
Born: Kentucky
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | MAYER |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 75 |
| Marital Status | Widowed |
| Birthplace | Kentucky |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Township / Ward | Chicago |
| Est. Birth Year | ~1865 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mildred Mayer | Daughter | — | 38 | ~1902 |
| John Mayer | Head | — | 75 | ~1865 |
Census Appearances
1920
Cook, Illinois
Head, age 54
Cook, Illinois · implied b. ~1866 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mayer |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Kentucky |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Superintendent |
| Industry | Publishing House |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1930
Cook, Illinois
Head, age 64
Cook, Illinois · implied b. ~1866 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mayer |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 64 |
| Marital Status | Married |
| Birthplace | Kentucky |
| Age at First Marriage | 30 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Superintendent |
| Industry | Printing |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 14000 |
| Radio Set | R |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Cook-County, Illinois
Head, age 75
Cook-County, Illinois · implied b. ~1865 — 2 household members
| Surname | MAYER |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 75 |
| Marital Status | Widowed |
| Birthplace | Kentucky |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
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 Mayer 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 Mayer
Head · 1940 · age 75 · b. ~1865 · 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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01022-00200)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Carl B. Cronin | 25 | Son | Office Clerk | Illinois |
| 42 | Irene M. Cronin | 18 | Daughter | Telephone Oper. | Illinois |
| 43 | Jean M. Cronin | 15 | Daughter | — | Illinois |
| 44 | James F. Cronin | 9 | Son | — | Illinois |
| 45 | John H. Mayer THIS PERSON | 75 | Head | — | Kentucky |
| 46 | Mildred M. Mayer | 38 | Daughter | — | Illinois |
| 47 | F. Walter Anderson | 46 | Head | Statistician | Illinois |
| 48 | Anne L. Anderson | 42 | Wife | — | Illinois |
| 49 | Harry Ottesen | 47 | Brother-in-law | Food Dispenser | Illinois |
| 50 | Christine High | 45 | Lodger | Laboratory Technician | Illinois |
| 51 | Arthur R. Petrie | 36 | Head | Teacher | Illinois |
| 52 | Jean L. Petrie | 30 | Wife | — | Wisconsin |
| 53 | Arthepan Petrie | 8 | Daughter | — | Illinois |
| 54 | William H. Petrie | 5 | Son | — | Illinois |
| 55 | Edward L. Peters | 54 | Head | Proprietor | Illinois |
| 56 | Bernadette Peters | 44 | Wife | — | Illinois |
| 57 | Edward L. Peters | 17 | Son | — | Illinois |
| 58 | Delia Kinley | 64 | Head | — | Pennsylvania |
| 59 | Gertrude Bondane | 39 | Lodger | Housework | Pennsylvania |
| 60 | Mary Herd | 30 | Niece | — | Illinois |
| 61 | Charles F. Zipperle | 50 | Head | Iceman | Wisconsin |
| 62 | Angie Zipperle | 52 | Wife | — | Illinois |
| 63 | Gwendolyn Zipperle | 21 | Daughter | Telephone Oper. | Illinois |
| 64 | Norman H. Meyer | 46 | Lodger | Office Clerk | Illinois |
| 65 | Karl P. Ehr | 41 | Head | Assistant Manager | Illinois |
| 66 | Frieda Ehr | 38 | Wife | — | Illinois |
| 67 | Joann Ehr | 12 | Daughter | — | Illinois |
| 68 | Roman J. Melcher | 39 | Head | Operating Engineer | Wisconsin |
| 69 | Mary Elizabeth Melcher | 33 | Wife | — | Michigan |
| 70 | Donald Frederick Melcher | 6 | Son | — | Illinois |
| 71 | David Daniel Melcher | 3 | Son | — | Illinois |
| 72 | Richard Keith Melcher | 2 | Son | — | Illinois |
| 73 | Daniel E. Goodman | 76 | Father-in-law | — | New York |
| 74 | Nellie Goodman | 64 | Mother-in-law | Practical Nurse (24-Hr Duty) | Michigan |
| 75 | Loretta Leahy | 45 | Head | School Teacher | Illinois |
| 76 | Kathleen Leahy | 15 | Daughter | — | Illinois |
| 77 | Rose Ann Leahy | 10 | Daughter | — | Illinois |
| 78 | Gertrude M. Kelley | 31 | Niece | Office Clerk | Illinois |
| 79 | Bridget Mcchidy | 86 | Mother | — | New York |
| 80 | Isadore Borin | 70 | Head | — | Russia |
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)