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James Mcmahon — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Suffolk, Massachusetts
Our Model Tree links this James Mcmahon across the 1920 and 1930 US Censuses in Suffolk, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1914), then head of a 9-person household.
Age 16
b. ~1914
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Suffolk, Massachusetts |
| Surname | McMahon |
| Given Name | James A. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1914 |
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 1930 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Lucille Mcmahon | Daughter | — | 12 | ~1918 |
| Winifred Mcmahon | Daughter | — | 17 | ~1913 |
| Alice Mcmahon | Daughter | — | 21 | ~1909 |
| Marguerite Mcmahon | Daughter | — | 8 | ~1922 |
| Dorothy Mcmahon | Daughter | — | 5 | ~1925 |
| James Mcmahon | Head | — | 48 | ~1882 |
| Winifred Mcmahon | Other | — | 43 | ~1887 |
| Harold Mcmahon | Son | — | 14 | ~1916 |
| James Mcmahon | Son | — | 16 | ~1914 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 5
Suffolk, Massachusetts · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 16
Suffolk, Massachusetts · implied b. ~1914 — 9 household members
| Surname | McMahon |
| Given Name | James A. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| 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 James Mcmahon across 2 US Census years (1920 and 1930) in Suffolk, Massachusetts, using XGBoost record linkage.
Show:
This person
Anchor record
James Mcmahon
Son · 1930 · age 16 · b. ~1914 · Massachusetts
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Sibling
Dorothy Mcmahon
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Mcmahon
Sibling · 1930 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marguerite Mcmahon
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Mcmahon
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Winifred Mcmahon
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucille Mcmahon
Sibling · 1930 · age 12
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 — Suffolk, Massachusetts
Open full size
1930 US Federal Census — Suffolk, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel955:1085)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Sarah Anderson | 64 | Head | None | Canada-English |
| 2 | John Anderson | 35 | son | Laborer | Massachusetts |
| 3 | Matilda Anderson | 29 | daughter | Operator | Massachusetts |
| 4 | Mildred Mary Anderson | 21 | daughter | None | Massachusetts |
| 5 | William J. Chamberlain | 58 | Head | Carpenter | Massachusetts |
| 6 | Nora M. Chamberlain | 52 | wife-H | None | Massachusetts |
| 7 | Joseph W. Chamberlain | 24 | son | None | Massachusetts |
| 8 | Katherine A. Chamberlain | 22 | daughter | Teacher | Massachusetts |
| 9 | Edward F. Chamberlain | 19 | son | Clerk | Massachusetts |
| 10 | James J. Chamberlain | 17 | son | Clerk | Massachusetts |
| 11 | Rita E. Chamberlain | 14 | daughter | None | Massachusetts |
| 12 | Hermisdas Benoit | 22 | Head | Clipper | Massachusetts |
| 13 | Eva A. Benoit | 19 | wife-H | Assembler | Massachusetts |
| 14 | John A. Mclean | 59 | Head | Foreman | Canada-English |
| 15 | Albert A. Mclean | 30 | son | Engineer | Massachusetts |
| 16 | Victor A. Mclean | 48 | Head | Painter | Canada-English |
| 17 | Elizabeth N. Mclean | 46 | wife-H | None | Canada-English |
| 18 | Clark A. Mclean | 21 | son | Chauffeur | Canada-English |
| 19 | John W. Mclean | 12 | son | None | Canada-English |
| 20 | Neil Mckeller | 50 | Head | Laborer | Scotland |
| 21 | Sarah Mckeller | 49 | wife-H | Laundress | Massachusetts |
| 22 | Dorothy Mckeller | 22 | daughter | Feeder | Massachusetts |
| 23 | Donald Mckeller | 14 | son | None | Massachusetts |
| 24 | James A. Mcmahon | 48 | Head | Tool Maker | Massachusetts |
| 25 | Winifred Mcmahon | 43 | wife-H | None | Massachusetts |
| 26 | Alice Mcmahon | 21 | daughter | Bookkeeper | Massachusetts |
| 27 | Winifred V. Mcmahon | 17 | daughter | Bookkeeper | Massachusetts |
| 28 | James A. Mcmahon THIS PERSON | 16 | son | None | Massachusetts |
| 29 | Harold J. Mcmahon | 14 | son | None | Massachusetts |
| 30 | Lucille M. Mcmahon | 12 | daughter | None | Massachusetts |
| 31 | Marguerite Mcmahon | 8 | daughter | None | Massachusetts |
| 32 | Dorothy J. Mcmahon | 5 | daughter | None | Massachusetts |
| 33 | Mary J. Cronan | 67 | Head | None | Irish Free State |
| 34 | Donald R. Meister | 25 | roomer | Painter | Canada-English |
| 35 | Joseph J. Sweeney | 35 | roomer | Counter-Man | Maine |
| 36 | Luke E. Mcguiness | 58 | Head | Attorney | Massachusetts |
| 37 | Annie E. Mcguiness | 54 | wife-H | None | Massachusetts |
| 38 | Gertrude L. Mcguiness | 25 | daughter | None | Massachusetts |
| 39 | Alice E. Mcguiness | 22 | daughter | Stenographer | Massachusetts |
| 40 | John T. Mcguiness | 55 | brother | Iron Worker | Massachusetts |
| 41 | James A. Moore | 32 | Head | Electrician | Massachusetts |
| 42 | George F. Moore | 28 | brother | Worker | Massachusetts |
| 43 | Charles W. Moore | 28 | brother | Clerk | Massachusetts |
| 44 | Elizabeth J. Moore | 23 | sister | Stenographer | Massachusetts |
| 45 | Annie Moore | 62 | mother | None | Northern Ireland |
| 46 | Margaret M. Daly | 86 | Head | None | Massachusetts |
| 47 | Mary P. Daly | 42 | daughter | Stenographer | Massachusetts |
| 48 | Helen G. Daly | 37 | daughter | Stenographer | Massachusetts |
| 49 | George A. Murphy | 41 | Head | Dealer | Massachusetts |
| 50 | Theresa R. Murphy | 41 | wife-H | None | Massachusetts |
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)