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John Maher — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Maher across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1910), then head of a 8-person household.
Age 30
b. ~1910
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Maher |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Salesman |
| Industry | Specialties |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2500 |
| Highest Grade | 8 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Salesman |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1910 |
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 |
|---|---|---|---|---|
| Honey Maher | Daughter | — | ~1940 | |
| James Maher | Son | — | 5 | ~1935 |
| John Maher | Son | — | 11 | ~1929 |
| Jerry Maher | Son | — | 3 | ~1937 |
| Julia Maher | Daughter | — | 7 | ~1933 |
| Julia Maher | Spouse | — | 28 | ~1912 |
| John Maher | Head | — | 30 | ~1910 |
| Donald Maher | Son | — | 8 | ~1932 |
Census Appearances
1930
Cook, Illinois
Son, age 20
Cook, Illinois · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Maher |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Irish Free State |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 30
Cook-County, Illinois · implied b. ~1910 — 8 household members
| Surname | Maher |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Salesman |
| Industry | Specialties |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2500 |
| Highest Grade | 8 |
| 1935 Residence | Illinois |
| 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 Maher across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Maher
Head · 1940 · age 30 · b. ~1910 · 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-t0627-00932-00336)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Alexander B. Anderson | 50 | Head | Draftsman | Illinois |
| 2 | Sarah Anderson | 53 | Wife | — | Virginia |
| 3 | Alexander B. Anderson | 25 | Son | — | Illinois |
| 4 | Donald Higgins | 25 | Head | Truck Driver | Kansas |
| 5 | Dorothy Higgins | 22 | Wife | — | Indiana |
| 6 | Betty Joann Higgins | 5 | Daughter | — | Illinois |
| 7 | Edward P. Kearns | 41 | Head | Lawyer | Illinois |
| 8 | Beatrice B. Kearns | 37 | Wife | — | Wisconsin |
| 9 | Eugene E. Kearns | 12 | Son | — | Illinois |
| 10 | John A. Kearns | 10 | Son | — | Illinois |
| 11 | Earl B. Higgins | 48 | Head | — | Iowa |
| 12 | Effie A. Higgins | 45 | Wife | — | Missouri |
| 13 | William V. Higgins | 16 | Son | — | Iowa |
| 14 | Patsy M. Higgins | 9 | Daughter | — | Kansas |
| 15 | George W. Herbert | 28 | Head | Butcher | Illinois |
| 16 | Grace E. Herbert | 24 | Wife | — | Illinois |
| 17 | Donald W. Leach | 4 | Step-son | — | Illinois |
| 18 | Robert J. Leach | 3 | Step-son | — | Illinois |
| 19 | John J. Maher THIS PERSON | 30 | Head | Salesman | Illinois |
| 20 | Julia C. Maher | 28 | Wife | — | Illinois |
| 21 | John B. Maher | 11 | Son | — | Illinois |
| 22 | Donald J. Maher | 8 | Son | — | Illinois |
| 23 | Julia A. Maher | 7 | Daughter | — | Illinois |
| 24 | James R. Maher | 5 | Son | — | Illinois |
| 25 | Jerry M. Maher | 3 | Son | — | Illinois |
| 26 | Honey M. Maher | 0 | Daughter | — | Illinois |
| 27 | James E. Stewart | 37 | Head | Crane Operator | Illinois |
| 28 | Greta A. Stewart | 35 | Wife | — | Illinois |
| 29 | Betty L. Stewart | 7 | Daughter | — | Illinois |
| 30 | Mary Ann Stewart | 3 | Daughter | — | Illinois |
| 31 | Thomas J. Mckee | 73 | Head | Office Clerk | Illinois |
| 32 | Margaret F. Mckee | 45 | Wife | — | Illinois |
| 33 | Rose Mary Mckee | 10 | Daughter | — | Illinois |
| 34 | Charles Noel | 78 | Head | — | England |
| 35 | Margaret Noel | 70 | Wife | — | Michigan |
| 36 | Walter Postrozny | 30 | Head | Baker | New York |
| 37 | Veronica Postrozny | 26 | Wife | Shirt Finisher | Illinois |
| 38 | Patricia Postrozny | 1 | Daughter | — | Illinois |
| 39 | Helen Peciak | 20 | Sister-in-law | — | Canada |
| 40 | William Bowen | 41 | Head | Janitor | Illinois |
Related Census Records
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)