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Margaret Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Saratoga-County, New York
Our Model Tree links this Margaret Mcmahon across the 1930 and 1940 US Censuses in Saratoga-County, New York (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 9-person household.
Age 12
b. ~1928
Female
Daughter
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Saratoga-County, New York |
| Surname | McMahon |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Saratoga Spgs |
| 1935 Residence (County) | Saratoga |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Township / Ward | Saratoga Spgs |
| Est. Birth Year | ~1928 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| John Mcmahon | Son | — | 11 | ~1929 |
| Edward Mcmahon | Son | — | 8 | ~1932 |
| Margaret Mcmahon | Daughter | — | 12 | ~1928 |
| Elizabeth Mcmahon | Daughter | — | 5 | ~1935 |
| Mary Mcmahon | Daughter | — | 15 | ~1925 |
| Carl Mcmahon | Head | — | 55 | ~1885 |
| Katherine Mcmahon | Daughter | — | 5 | ~1935 |
| Jeanne Mcmahon | Daughter | — | 17 | ~1923 |
| Mary Mcmahon | Spouse | — | 41 | ~1899 |
Census Appearances
1930
Saratoga, New …
Daughter, age 3
Saratoga, New York · implied b. ~1927 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Can Read/Write | No |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Saratoga-County, New …
Daughter, age 12
Saratoga-County, New York · implied b. ~1928 — 9 household members
| Surname | McMahon |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Saratoga Spgs |
| 1935 Residence (County) | Saratoga |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 Margaret Mcmahon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Margaret Mcmahon
Daughter · 1940 · age 12 · b. ~1928 · New York
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Sibling
Katherine Mcmahon
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcmahon
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcmahon
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcmahon
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jeanne Mcmahon
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Mcmahon
Sibling · 1940 · age 5
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 — Saratoga-County, New York
Open full size
1940 US Federal Census — Saratoga-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02773-00546)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Engle | 78 | Mother in law | — | New York |
| 2 | Henry Ryall | 70 | Head | Contractor | New York |
| 3 | Lottie Ryall | 58 | Wife | Housewife | New York |
| 4 | Ida O Williamson | 60 | Head | Hall Clerk | New York |
| 5 | Rene Packard | 71 | Lodger | Asst Cook | Canada French |
| 6 | Lodger Edmere | None | F | Home | — |
| 7 | Lodger Wendell | None | M | — | — |
| 8 | Frank J Keehan | 51 | Head | Engineer | New York |
| 9 | Katherine Keehan | 52 | Wife | Housewife | New York |
| 10 | Margaret Cox | 72 | Mother in law | — | Virginia |
| 11 | Frank J Keehan | 21 | Son | Student | New York |
| 12 | William Bryant | 31 | Head | Shipping Clk | New York |
| 13 | Katherine Bryant | 21 | Wife | Housewife | New York |
| 14 | Peggy Anne Bryant | 3 | Daughter | — | New York |
| 15 | Harry Bryant | 25 | Brother | Painter | New York |
| 16 | Benjamin Rumville | 68 | Head | — | New York |
| 17 | Louise Rumville | 67 | Wife | Housework | Nova Scotia |
| 18 | Adolf Hellwig | 63 | Head | Butcher | Conn |
| 19 | Viola Hellwig | 54 | Wife | Housewife | New York |
| 20 | Spencer Hellwig | 28 | Son | Butcher | Conn |
| 21 | Jessie Hellwig | 28 | Daughter in law | — | Tennessee |
| 22 | Spencer Jr Hellwig | 1 | Grandson | — | New York |
| 23 | Carl L Mcmahon | 55 | Head | Lawyer | New York |
| 24 | Mary Mcmahon | 41 | Wife | — | New York |
| 25 | Jeanne Mcmahon | 17 | Daughter | — | New York |
| 26 | Mary Mcmahon | 15 | Daughter | — | New York |
| 27 | Margaret Mcmahon THIS PERSON | 12 | Daughter | — | New York |
| 28 | John Mcmahon | 11 | Son | — | New York |
| 29 | Edward Mcmahon | 8 | Son | — | New York |
| 30 | Elizabeth Mcmahon | 5 | Daughter | — | New York |
| 31 | Katherine Mcmahon | 5 | Daughter | — | New York |
| 32 | Hacle Semple | 53 | Head | House Mother | New York |
| 33 | Carleton King | 36 | Head | Lawyer | New York |
| 34 | Constance King | 35 | Wife | Housewife | New York |
| 35 | Carleton Jr King | 2 | Son | — | New York |
| 36 | Constance King | 0 | Daughter | — | New York |
| 37 | Marjorie Robede | 24 | Maid | Maid | New York |
| 38 | John Proper | 67 | Head | Salesman | New York |
| 39 | Edna Proper | 67 | Wife | — | New York |
| 40 | Marilyn Swarthout | 10 | Granddaughter | — | New York |
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)