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John Mahoney — 1930 US Census Record
Model Tree available1930 United States Federal Census · Suffolk, Massachusetts
Our Model Tree links this John Mahoney across the 1920, 1930 and 1940 US Censuses in Suffolk, Massachusetts (XGBoost, ~Confirmed), with identified parents Julia — first a son (b.~1895), then head of a 4-person household.
Age 35
b. ~1895
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Suffolk, Massachusetts |
| Surname | Mahoney |
| Given Name | John H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Occupation | Chauffeur |
| Industry | Transit Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Chauffeur |
| Township / Ward | Boston |
| Est. Birth Year | ~1895 |
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.
4 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Julia Mahoney | Head | — | 74 | ~1856 |
| Mary Bryan | Other | — | 70 | ~1860 |
| Nora Kelleher | Other | — | 77 | ~1853 |
| John Mahoney | Son | — | 35 | ~1895 |
Census Appearances
1920
Suffolk, Massachusetts
Other, age 25
Suffolk, Massachusetts · implied b. ~1895 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | John H |
| Relationship to Head | At Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| 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
Suffolk, Massachusetts
Son, age 35
Suffolk, Massachusetts · implied b. ~1895 — 4 household members
| Surname | Mahoney |
| Given Name | John H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Irish Free State |
| Occupation | Chauffeur |
| Industry | Transit Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Head, age 46
Suffolk-County, Massachusetts · implied b. ~1894 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahony |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | Janitor |
| Industry | Chemical Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1250 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Julia Mahoney (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Julia Mahoney
b. ~1856
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mahoney
Son · 1930 · age 35 · b. ~1895 · Massachusetts
★ You are viewing this record
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:massachusettscensus00reel948:0217)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Cornelius J Kelleher | 29 | Son | Shoe Worker | Massachusetts |
| 52 | Helen M Kelleher | 26 | Daughter | Supervisor | Massachusetts |
| 53 | Robert E Kelleher | 17 | Son | — | Massachusetts |
| 54 | Mary A Dwyer | 54 | Head | — | Massachusetts |
| 55 | Matthew John T Dwyer | 58 | Brother | Janitor | Massachusetts |
| 56 | Thomas E Dwyer | 56 | Brother | Piano Worker | Massachusetts |
| 57 | Frank J Dwyer | 52 | Brother | Janitor | Massachusetts |
| 58 | Patrick J Lally | 43 | Head | Laborer | Irish Free State |
| 59 | Nellie Lally | 40 | Wife | — | Irish Free State |
| 60 | William J Lally | 20 | Son | Clerk | Massachusetts |
| 61 | Patrick J Lally | 19 | Son | Clerk | Massachusetts |
| 62 | Helen Lally | 16 | Daughter | — | Massachusetts |
| 63 | Margaret Lally | 11 | Daughter | — | Massachusetts |
| 64 | Julia M C Mahoney | 74 | Head | — | Massachusetts |
| 65 | John H Mahoney THIS PERSON | 35 | Son | Chauffeur | Massachusetts |
| 66 | Mary E Bryan | 70 | Sister | — | Massachusetts |
| 67 | Nora J Kelleher | 77 | Lodger | — | Massachusetts |
| 68 | Richard Cushing | 41 | Head | Car Washer | Irish Free State |
| 69 | Catherine Cushing | 37 | Wife | — | Irish Free State |
| 70 | Mary Cushing | 14 | Daughter | — | Massachusetts |
| 71 | Helen Cushing | 13 | Daughter | — | Massachusetts |
| 72 | Rita P Cushing | 11 | Daughter | — | Massachusetts |
| 73 | Richard James Cushing | 8 | Son | — | Massachusetts |
| 74 | Robert J Cushing | 5 | Son | — | Massachusetts |
| 75 | Teresa R Cushing | 2 | Daughter | — | Massachusetts |
| 76 | Regina E Cushing | 1 | Daughter | — | Massachusetts |
| 77 | Jennie M Moriarty | 60 | Head | — | Canada English |
| 78 | Aurelius J Moriarty | 24 | Son | Presser | Massachusetts |
| 79 | James W Finnerty | 59 | Head | Painter | Massachusetts |
| 80 | Kathryn E Finnerty | 57 | Wife | — | Canada English |
| 81 | Marion E Finnerty | 35 | Daughter | Secretary | Massachusetts |
| 82 | Margaret H Finnerty | 26 | Daughter | Lawyer | Massachusetts |
| 83 | Margaret Clancy | 75 | Head | — | Northern Ireland |
| 84 | James J Clancy | 55 | Brother | Laborer | England |
| 85 | Maria Clancy | 45 | Sister | Laborer | Northern Ireland |
| 86 | John Clancy | 58 | Brother | Bookkeeper | Northern Ireland |
| 87 | John J Carmody | 50 | Head | Blacksmith | Massachusetts |
| 88 | Mary E Carmody | 48 | Wife | — | Massachusetts |
| 89 | Lillian E Carmody | 27 | Daughter | Bookkeeper | Massachusetts |
| 90 | Albert E Carmody | 18 | Son | — | Massachusetts |
| 91 | Madeline H Carmody | 12 | Daughter | — | Massachusetts |
| 92 | Joseph F O'Brien | 35 | Head | Shoemaker | Massachusetts |
| 93 | Catherine O'Brien | 35 | Wife | — | Irish Free State |
| 94 | Mary E O'Brien | 23 | Sister | Bookkeeper | Massachusetts |
| 95 | Catherine A O'Brien | 21 | Sister | Bookkeeper | Massachusetts |
| 96 | Charles A Cronin | 21 | Lodger | Conductor | Massachusetts |
| 97 | George E O'Connor | 50 | Head | Painter | Canada English |
| 98 | Alice L O'Connor | 62 | Wife | — | Canada English |
| 99 | Gafagan Gertrude | 64 | Head | — | Massachusetts |
| 100 | Katherine Gafagan | 67 | Sister | — | Massachusetts |
Pedigree Summary
John
Gen 1 · 1 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)