MM
Mary Mahoney — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Bay-County, Michigan
Our Model Tree links this Mary Mahoney across the 1920, 1930 and 1940 US Censuses in Bay-County, Michigan (XGBoost, ~Confirmed) — first a spouse (b.~1880), then head of a 6-person household.
Age 60
b. ~1880
Female
Spouse
Born: Michigan
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Bay-County, Michigan |
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | Bay City |
| 1935 Residence (County) | Bay |
| Additional Details | |
| Industry | H |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Township / Ward | Bay City |
| Est. Birth Year | ~1880 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Lenore Mahoney | Daughter | — | 30 | ~1910 |
| Agatha Mahoney | Daughter | — | 24 | ~1916 |
| Peter Mahoney | Head | — | 60 | ~1880 |
| Cornelius Mahoney | Son | — | 32 | ~1908 |
| Charles Mahoney | Son | — | 23 | ~1917 |
| Mary Mahoney | Spouse | — | 60 | ~1880 |
Census Appearances
1920
Bay, Michigan
Spouse, age 39
Bay, Michigan · implied b. ~1881 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mamie |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Michigan |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1930
Bay, Michigan
Other, age 50
Bay, Michigan · implied b. ~1880 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mamie |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Michigan |
| Age at First Marriage | 27 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Ohio |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Bay-County, Michigan
Spouse, age 60
Bay-County, Michigan · implied b. ~1880 — 6 household members
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | Bay City |
| 1935 Residence (County) | Bay |
| Industry | H |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 Mary Mahoney across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mahoney
Spouse · 1940 · age 60 · b. ~1880 · Michigan
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Bay-County, Michigan
Open full size
1940 US Federal Census — Bay-County, Michigan
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01728-00700)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Raymond J. Steff | 37 | Head | Foreman | Michigan |
| 2 | Laura Steff | 36 | Wife | — | Michigan |
| 3 | Geraldine Steff | 16 | Daughter | — | Michigan |
| 4 | Raymond Steff | 5 | Son | — | Michigan |
| 5 | Clifford Steff | 4 | Son | — | Michigan |
| 6 | William S. Adrian | 71 | Head | Railroad Worker | Ohio |
| 7 | Carrie K. Adrian | 35 | Wife | — | Michigan |
| 8 | Robert W. Adrian | 12 | Son | — | Michigan |
| 10 | Peter S. Mahoney | 60 | Head | Conductor | Canada |
| 11 | Mary Mahoney THIS PERSON | 60 | Wife | — | Michigan |
| 12 | Cornelius J. Mahoney | 32 | Son | Lineman | Michigan |
| 13 | Lenore Mahoney | 30 | Daughter | — | Michigan |
| 14 | Agatha Marie Mahoney | 24 | Daughter | Attendance Officer | Michigan |
| 15 | Charles Mahoney | 23 | Son | Welder Machinist | Michigan |
| 16 | Mary J. Sullivan | 64 | Head | — | Canada |
| 17 | Daniel M. Sullivan | 29 | Son | Machinist | Michigan |
| 18 | John J. Sullivan | 22 | Son | Chemist | Michigan |
| 19 | James C. Gallagher | 65 | Head | — | Ohio |
| 20 | John P. Urban | 50 | Head | Supt. Creamery Co. | Michigan |
| 21 | Lillian Urban | 24 | Daughter | — | Michigan |
| 22 | Helen Urban | 16 | Daughter | — | Michigan |
| 23 | Edward Redmond | 30 | Head | Office Clerk | Michigan |
| 24 | Bernetta L. Redmond | 27 | Wife | — | Michigan |
| 25 | Jean Redmond | 5 | Daughter | — | Michigan |
| 26 | Patrick Redmond | 4 | Son | — | Michigan |
| 27 | Louis A. Grove | 52 | Head | Inspector Of Cars | Michigan |
| 28 | Stella Grove | 45 | Wife | — | Michigan |
| 29 | Dorothy Grove | 15 | Daughter | — | Michigan |
| 30 | Donald Grove | 14 | Son | — | Michigan |
| 31 | Myron Atherton | 42 | Head | Railroad Switchman | Michigan |
| 32 | Stella Atherton | 38 | Wife | — | Ohio |
| 33 | Blanch Atherton | 15 | Daughter | — | Michigan |
| 34 | Audrey Atherton | 6 | Daughter | — | Michigan |
| 35 | Arthur Downey | 41 | Head | Auto Assembler | Michigan |
| 36 | Anna Downey | 32 | Wife | — | Ohio |
| 37 | Gerald Downey | 5 | Son | — | Michigan |
| 38 | Joann Downey | 4 | Daughter | — | Michigan |
| 39 | Thomas Hurdvold | 58 | Head | Bridge Carpenter | Ohio |
| 40 | Mable Hurdvold | 51 | Wife | — | Ohio |
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)