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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.~1912), then head of a 10-person household.
Age 18
b. ~1912
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Suffolk, Massachusetts |
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Age at First Marriage | 18 |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Bookbinder |
| Industry | Printing |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Bookbinder |
| Township / Ward | Boston City |
| Est. Birth Year | ~1912 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Loretta Mcmahon | Daughter | — | 15 | ~1915 |
| Annette Mcmahon | Daughter | — | 13 | ~1917 |
| Ruth Mcmahon | Daughter | — | 8 | ~1922 |
| Marie Mcmahon | Daughter | — | 10 | ~1920 |
| John Mcmahon | Head | — | 39 | ~1891 |
| Edward Mcmahon | Son | — | 16 | ~1914 |
| George Mcmahon | Son | — | 17 | ~1913 |
| James Mcmahon | Son | — | 18 | ~1912 |
| Philip Mcmahon | Son | — | 6 | ~1924 |
| Katherine Mcmahon | Spouse | — | 40 | ~1890 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 8
Suffolk, Massachusetts · implied b. ~1912 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James F. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 18
Suffolk, Massachusetts · implied b. ~1912 — 10 household members
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Age at First Marriage | 18 |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Bookbinder |
| Industry | Printing |
| Class of Worker | W |
| 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 18 · b. ~1912 · Massachusetts
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Sibling
Annette Mcmahon
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcmahon
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Loretta Mcmahon
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Mcmahon
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Philip Mcmahon
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Mcmahon
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Mcmahon
Sibling · 1930 · age 8
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
21 people indexed on this census page (ia:1930:massachusettscensus00reel948:0508)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | John Mcmahon | 39 | Head | Shipper | Massachusetts |
| 52 | Katherine Mcmahon | 40 | Wife | — | Massachusetts |
| 53 | James Mcmahon THIS PERSON | 18 | Son | Bookbinder | Massachusetts |
| 54 | George Mcmahon | 17 | Son | — | Massachusetts |
| 55 | Edward Mcmahon | 16 | Son | Bellboy | Massachusetts |
| 56 | Loretta Mcmahon | 15 | Daughter | — | Massachusetts |
| 57 | Annette Mcmahon | 13 | Daughter | — | Massachusetts |
| 58 | Marie Mcmahon | 10 | Daughter | — | Massachusetts |
| 59 | Ruth Mcmahon | 8 | Daughter | — | Massachusetts |
| 60 | Philip Mcmahon | 6 | Son | — | Massachusetts |
| 61 | Albert Burns | 45 | Head | Carpenter | Scotland |
| 62 | Margaret Burns | 41 | Wife | — | Canada English |
| 63 | Robert Burns | 19 | Son | Lathe Hand | Massachusetts |
| 64 | Winifred Burns | 11 | Daughter | — | Massachusetts |
| 65 | George Burns | 12 | Son | — | Massachusetts |
| 66 | Lillian Burns | 8 | Daughter | — | Massachusetts |
| 67 | Joseph Bailey | 46 | Head | Machinist | Vermont |
| 68 | Margaret Bailey | 42 | Wife | — | Irish Free State |
| 69 | Everett Bailey | 11 | Son | — | Massachusetts |
| 70 | Arthur Bailey | 8 | Son | — | Massachusetts |
| 71 | Mary Purking | 65 | Mother-in-law | — | 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)