JM
John Mahoney — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this John Mahoney across the 1910, 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1910), then head of a 10-person household.
Age 20
b. ~1910
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Mahoney |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Plasterer |
| Industry | Building |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Plasterer |
| Township / Ward | Waltham City |
| Est. Birth Year | ~1910 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Abigail Mahoney | Daughter | — | 11 | ~1919 |
| Grace Mahoney | Daughter | — | 8 | ~1922 |
| Humphrey Mahoney | Daughter | — | 17 | ~1913 |
| Catherine Mahoney | Daughter | — | 3 | ~1927 |
| John Mahoney | Head | — | 54 | ~1876 |
| Joshua Mahoney | Son | — | 15 | ~1915 |
| Edward Mahoney | Son | — | 19 | ~1911 |
| John Mahoney | Son | — | 20 | ~1910 |
| Paul Mahoney | Son | — | 12 | ~1918 |
| Humphrey Mahoney | Spouse | — | 46 | ~1884 |
Census Appearances
1910
Middlesex, Massachusetts
Son, age
Middlesex, Massachusetts · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Middlesex, Massachusetts
Son, age 10
Middlesex, Massachusetts · implied b. ~1910 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 20
Middlesex, Massachusetts · implied b. ~1910 — 10 household members
| Surname | Mahoney |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Plasterer |
| Industry | Building |
| 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 John Mahoney across 3 US Census years (1910, 1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage. Identified parents: father John Mahoney (~0.92 confidence) and father John Mahoney (~0.92 confidence) and mother Humphrey Mahoney (~0.92 confidence) and mother Winifred Mahoney (~0.92 confidence) and mother Mary Mahoney (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Mahoney
b. ~1876
Source father
● Household
· direct · ~0.92
Father
John Mahoney
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Humphrey Mahoney
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Winifred Mahoney
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Mary Mahoney
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mahoney
Son · 1930 · age 20 · b. ~1910 · Massachusetts
★ You are viewing this record
Sibling
Abigail Mahoney
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Humphrey Mahoney
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Mahoney
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Grace Mahoney
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joshua Mahoney
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Mahoney
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mahoney
Sibling · 1930 · age 19
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
50 people indexed on this census page (ia:1930:massachusettscensus00reel930:0326)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Henry Henry | 23 | Son | — | Canada-French |
| 2 | Mabel Henry | 30 | Daughter | Bookkeeper | Massachusetts |
| 3 | Agnes Henry | 28 | Daughter | — | Massachusetts |
| 4 | Sally Henry | 27 | Daughter | Clerical | Massachusetts |
| 5 | Alice Henry | 23 | Daughter | Clerical | Massachusetts |
| 6 | Marie Henry | 22 | Daughter | Stenographer | Massachusetts |
| 7 | George Henry | 20 | Son | Shipper | Massachusetts |
| 8 | John Carney | 50 | Head | — | Massachusetts |
| 9 | Ella Carney | 33 | Wife | — | Massachusetts |
| 10 | Jeanne Carney | 11 | Daughter | — | Massachusetts |
| 11 | John Carney | 9 | Son | — | Massachusetts |
| 12 | Barbara Carney | 2 | Daughter | — | Massachusetts |
| 13 | Nellie Nystrom | 62 | Mother-in-law | — | Sweden |
| 14 | William Hirschberg | 39 | Head | Manager | New York |
| 15 | Mary Hirschberg | 39 | Wife | — | New York |
| 16 | Theodore Hirschberg | 8 | Son | — | New York |
| 17 | Jeanette Hirschberg | 2 | Daughter | — | Massachusetts |
| 18 | Irene Hirschberg | 0 | Son | — | Massachusetts |
| 19 | Anna Cahill | 25 | Maid | General Maid | Massachusetts |
| 20 | John Mahoney | 54 | Head | Watchmaker | Massachusetts |
| 21 | Humphrey Mahoney | 46 | Wife | — | Massachusetts |
| 22 | John A. Mahoney THIS PERSON | 20 | Son | Plasterer | Massachusetts |
| 23 | Edward Mahoney | 19 | Son | Plasterer | Massachusetts |
| 24 | Humphrey Mahoney | 17 | Daughter | — | Massachusetts |
| 25 | Joshua Mahoney | 15 | Son | — | Massachusetts |
| 26 | Paul Mahoney | 12 | Son | — | Massachusetts |
| 27 | Abigail Mahoney | 11 | Daughter | — | Massachusetts |
| 28 | Grace Mahoney | 8 | Daughter | — | Massachusetts |
| 29 | Catherine Mahoney | 3 | Daughter | — | Massachusetts |
| 30 | Herbert Calnan | 28 | Head | Salesman | Massachusetts |
| 31 | Anna Calnan | 26 | Wife | — | Massachusetts |
| 32 | Michael Shea | 60 | Father-in-law | Custodian | Massachusetts |
| 33 | Arthur Davidson | 50 | Head | Foreman | Canada-English |
| 34 | Mildred Davidson | 37 | Wife | Watch Polisher | Canada-English |
| 35 | John Connolly | 28 | Head | Photographer | Massachusetts |
| 36 | Beatrice Connolly | 22 | Wife | — | New Hampshire |
| 37 | Walter Rennie | 30 | Head | Iceman | Massachusetts |
| 38 | Mary Rennie | 25 | Wife | Secretary | Massachusetts |
| 39 | Roland Jacques | 27 | Head | Clerk | New Hampshire |
| 40 | Julia Jacques | 25 | Wife | — | New Hampshire |
| 41 | Ellen Jacques | 4 | Daughter | — | New Hampshire |
| 42 | Roland Jr. Jacques | 2 | Son | — | New Hampshire |
| 43 | Carl Svendsen | 25 | Head | Florist | Massachusetts |
| 44 | Ruth Svendsen | 23 | Wife | Clerk | Massachusetts |
| 45 | John Cruickshank | 37 | Head | Car Operator | Canada-English |
| 46 | Vesta Cruickshank | 33 | Wife | — | Canada-English |
| 47 | Dixon Cruickshank | 15 | Son | — | Canada-English |
| 48 | William F. West | 58 | Head | Polisher | Massachusetts |
| 49 | Elizabeth West | 59 | Wife | — | Irish Free State |
| 50 | Anthony West | 25 | Son | Watchmaker | Massachusetts |
Pedigree Summary
John + 7 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
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)