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Mary Mahoney — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Olmsted-County, Minnesota
Our Model Tree links this Mary Mahoney across the 1920, 1930 and 1940 US Censuses in Olmsted-County, Minnesota (XGBoost, ~Confirmed) — first a head (b.~1856), then head of a 5-person household.
Age 84
b. ~1856
Female
Head
Born: Wisconsin
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Olmsted-County, Minnesota |
| Surname | Mahoney |
| Given Name | Mary D |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 84 |
| Marital Status | Widowed |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Rochester City |
| 1935 Residence (County) | Olmsted |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Township / Ward | Rochester City |
| Est. Birth Year | ~1856 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mahoney | Head | — | 84 | ~1856 |
| Stella Mullen | Other | — | 24 | ~1916 |
| Blanche Moss | Other | — | 27 | ~1913 |
| Frank Mcgovern | Other | — | 44 | ~1896 |
| Roger Mahoney | Son | — | 40 | ~1900 |
Census Appearances
1920
Olmsted, Minnesota
Other, age 64
Olmsted, Minnesota · implied b. ~1856 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | Mother |
| Sex | F |
| Color / Race | White |
| Age | 64 |
| Marital Status | Widowed |
| Birthplace | Wisconsin |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1930
Olmsted, Minnesota
Head, age 73
Olmsted, Minnesota · implied b. ~1857 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mary C. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 73 |
| Marital Status | Widowed |
| Birthplace | Wisconsin |
| Father's Birthplace | Ireland Free State |
| Mother's Birthplace | Ireland Free State |
| Occupation | Rooming House |
| Industry | Rooming House |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 7000 |
| Radio Set | R |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Olmsted-County, Minnesota
Head, age 84
Olmsted-County, Minnesota · implied b. ~1856 — 5 household members
| Surname | Mahoney |
| Given Name | Mary D |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 84 |
| Marital Status | Widowed |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Rochester City |
| 1935 Residence (County) | Olmsted |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
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.
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This person
Anchor record
Mary Mahoney
Head · 1940 · age 84 · b. ~1856 · Minnesota
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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 — Olmsted-County, Minnesota
Open full size
1940 US Federal Census — Olmsted-County, Minnesota
Page Contents
13 people indexed on this census page (nara:1940:m-t0627-01944-00559)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Reed S Clegg | 28 | Head | Medical Doctor | Utah |
| 2 | Alberta G Clegg | 28 | Wife | Music Teacher | Utah |
| 3 | Mary D Mahoney THIS PERSON | 84 | Head | — | Wisconsin |
| 4 | Roger T Mahoney | 40 | Son | Salesman | Wisconsin |
| 5 | Blanche C Moss | 27 | Roomer | Registered Nurse | Canada |
| 6 | Stella L Mullen | 24 | Roomer | Registered Nurse | Canada |
| 7 | Frank Mcgovern | 44 | Brother | Gardener | Minnesota |
| 8 | Louis N D Nolan | 29 | Head | Buyer | Iowa |
| 9 | Edyth L Nolan | 32 | Wife | Technician | Minnesota |
| 10 | Bessie G B Elliott | 39 | Head | Bookkeeper | Minnesota |
| 11 | Ella Elliott | 64 | Mother | — | Minnesota |
| 12 | Catherine Jaeger | 24 | Roomer | Registered Nurse | North Dakota |
| 13 | Perry L Williams | 1 | Son | — | Minnesota |
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)