WM
William Mcmahon — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this William Mcmahon across the 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1916), then head of a 10-person household.
Age 14
b. ~1916
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Framingham Town |
| Est. Birth Year | ~1916 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Alice Mcmahon | Daughter | — | 17 | ~1913 |
| Mildred Mcmahon | Son | — | 6 | ~1924 |
| Robert Mcmahon | Son | — | 1 | ~1929 |
| Sadie Mcmahon | Other | — | 40 | ~1890 |
| William Mcmahon | Head | — | 40 | ~1890 |
| Rita Mcmahon | Daughter | — | 12 | ~1918 |
| Margaret Mcmahon | Daughter | — | 4 | ~1926 |
| Francis Mcmahon | Son | — | 20 | ~1910 |
| George Mcmahon | Son | — | 8 | ~1922 |
| William Mcmahon | Son | — | 14 | ~1916 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 4
Middlesex, Massachusetts · implied b. ~1916 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | William Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 14
Middlesex, Massachusetts · implied b. ~1916 — 10 household members
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 William Mcmahon across 2 US Census years (1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage.
Show:
This person
Anchor record
William Mcmahon
Son · 1930 · age 14 · b. ~1916 · Massachusetts
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Sibling
Alice Mcmahon
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mcmahon
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mcmahon
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Mcmahon
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Mcmahon
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Mcmahon
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mildred Mcmahon
Sibling · 1930 · age 6
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
1930 US Federal Census — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
49 people indexed on this census page (ia:1930:15thcensuspopula917unit:0294)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Austin P. Tierney | 31 | Head | Truck Driver | Massachusetts |
| 2 | Catherine A. Tierney | 30 | Wife-H | — | Irish Free State |
| 3 | Thomas Hannon | 39 | Head | Superintendent | England |
| 4 | Esther Hannon | 44 | Wife-H | Operator | Germany |
| 5 | Ethel G. Hannon | 13 | Daughter | — | Massachusetts |
| 6 | Ruth G. Hannon | 11 | Daughter | — | Massachusetts |
| 7 | Harry G. Hannon | 10 | Son | — | Massachusetts |
| 8 | Hazel G. Hannon | 7 | Daughter | — | Massachusetts |
| 9 | John T. Hannon | 5 | Son | — | Massachusetts |
| 10 | William T. Hannon | 3 | Son | — | Massachusetts |
| 11 | William Mcmahon | 40 | Head | Foreman | Massachusetts |
| 12 | Sadie Mcmahon | 40 | Wife-H | — | Massachusetts |
| 13 | Francis Mcmahon | 20 | Son | Operator | Massachusetts |
| 14 | Alice Mcmahon | 17 | Daughter | — | Massachusetts |
| 15 | William Mcmahon THIS PERSON | 14 | Son | — | Massachusetts |
| 16 | Rita Mcmahon | 12 | Daughter | — | Massachusetts |
| 17 | George Mcmahon | 8 | Son | — | Massachusetts |
| 18 | Mildred Mcmahon | 6 | Son | — | Massachusetts |
| 19 | Margaret Mcmahon | 4 | Daughter | — | Massachusetts |
| 20 | Robert Mcmahon | 1 | Son | — | Massachusetts |
| 21 | Joseph M. Ray | 31 | Head | Plumber | Massachusetts |
| 22 | Helen Ray | 32 | Wife-H | — | Massachusetts |
| 23 | Florence M. Ray | 12 | Daughter | — | Massachusetts |
| 24 | Virginia M. Ray | 10 | Daughter | — | Massachusetts |
| 25 | Joseph M. Ray | 5 | Son | — | Massachusetts |
| 26 | Isabelle T. Ray | 2 | Daughter | — | Massachusetts |
| 27 | Dominick Bontone | 42 | Head | Barber | Italy |
| 28 | Josephine Bontone | 37 | Wife-H | — | Italy |
| 29 | Anthony Bontone | 15 | Son | — | Massachusetts |
| 30 | John Bontone | 13 | Son | — | Massachusetts |
| 31 | Vincent Bontone | 12 | Son | — | Massachusetts |
| 32 | Dominick Bontone | 11 | Son | — | Massachusetts |
| 33 | Mary Bontone | 10 | Daughter | — | Massachusetts |
| 34 | Joseph Bontone | 6 | Son | — | Massachusetts |
| 35 | John Zofanti | 39 | Head | Chauffeur | Italy |
| 36 | Rose Zofanti | 39 | Wife-H | — | Italy |
| 37 | Philomena Zofanti | 18 | Daughter | — | Massachusetts |
| 38 | Mildred Zofanti | 16 | Daughter | — | Massachusetts |
| 39 | Alfreda Zofanti | 14 | Daughter | — | Massachusetts |
| 40 | Angela Zofanti | 11 | Daughter | — | Massachusetts |
| 41 | Carlo Speranza | 36 | Head | Laborer | Italy |
| 42 | Rose Speranza | 34 | Wife-H | — | Italy |
| 43 | Libert Speranza | 10 | Son | — | Massachusetts |
| 44 | Josephine Speranza | 7 | Daughter | — | Massachusetts |
| 45 | Thelma Speranza | 5 | Daughter | — | Massachusetts |
| 46 | Benjamin Speranza | 3 | Son | — | Massachusetts |
| 47 | Rose Speranza | 1 | Daughter | — | Massachusetts |
| 48 | Amelio Galdone | 37 | Head | Operator | Italy |
| 49 | Gaetana Galdone | 35 | Wife-H | — | Italy |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)