WM
William Mahoney — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this William Mahoney across the 1910, 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents Mary & Thomas — first a son (b.~1899), then head of a 6-person household.
Age 31
b. ~1899
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Mahoney |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Switch Repair |
| Industry | Telephone |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Switch Repair |
| Township / Ward | Cambridge City |
| Est. Birth Year | ~1899 |
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.
6 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Mary Mahoney | Daughter | — | 39 | ~1891 |
| George Mahoney | Son | — | 42 | ~1888 |
| Mary Mahoney | Spouse | — | 69 | ~1861 |
| Margaret Mahoney | Daughter | — | 33 | ~1897 |
| William Mahoney | Son | — | 31 | ~1899 |
| Thomas Mahoney | Head | — | 70 | ~1860 |
Census Appearances
1910
Middlesex, Massachusetts
Son, age 11
Middlesex, Massachusetts · implied b. ~1899 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Middlesex, Massachusetts
Son, age 21
Middlesex, Massachusetts · implied b. ~1899 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Clerk |
| Industry | Office |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 31
Middlesex, Massachusetts · implied b. ~1899 — 6 household members
| Surname | Mahoney |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Switch Repair |
| Industry | Telephone |
| 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 William Mahoney across 3 US Census years (1910, 1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage. Identified parents: mother Mary Mahoney (~0.92 confidence) and father Thomas Mahoney (~0.92 confidence) and mother Mary Mahoney (~0.92 confidence) and father Daniel Mahoney (~0.92 confidence) and mother Annie Mahoney (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Mahoney
b. ~1861
Source mother
● Household
· direct · ~0.92
Father
Thomas Mahoney
b. ~1861
Source father
● Household
· direct · ~0.92
Mother
Mary Mahoney
b. ~1863
Source mother
● Household
· direct · ~0.92
Father
Daniel Mahoney
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Annie Mahoney
b. ~1876
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Mahoney
Son · 1930 · age 31 · b. ~1899 · Massachusetts
★ You are viewing this record
Sibling
George Mahoney
Sibling · 1930 · age 42
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mahoney
Sibling · 1930 · age 39
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mahoney
Sibling · 1930 · age 33
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:massachusettscensus00reel915:0808)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Edgar P. Wiedenhoefer | 24 | Roomer | — | Michigan |
| 52 | William G. Reilly | 58 | Head | Fireman Capt | Canada English |
| 53 | Elsie A. Reilly | 51 | Wife | — | Massachusetts |
| 54 | Paul A. Burke | 80 | Head | — | Maine |
| 55 | Elizabeth Burke | 70 | Wife | — | Canada English |
| 56 | Fred H. Burke | 40 | Son | City Clerk | Maine |
| 57 | John Allen | 58 | Head | Dept. Of Military | Irish Free State |
| 58 | Florence M. Lyons | 33 | Daughter | Library Clerk | Massachusetts |
| 59 | Margaret V. Lyons | 3 | Granddaughter | — | Massachusetts |
| 60 | Rose O'Neil | 42 | Servant | Servant | Massachusetts |
| 61 | Katharine Dunn | 63 | Head | — | Canada English |
| 62 | Mary E. Dunn | 30 | Daughter | Secretary | Massachusetts |
| 63 | Richard J. Dunn | 26 | Son | Salesman | Massachusetts |
| 64 | Katharine Dunn | 23 | Daughter | Stenographer | Massachusetts |
| 65 | Martha Regan | 40 | Roomer | Collector | Irish Free State |
| 66 | Thomas H. Mahoney | 70 | Head | Bracer Maker | Massachusetts |
| 67 | Mary F. Mahoney | 69 | Wife | — | Massachusetts |
| 68 | George F. Mahoney | 42 | Son | Agent | Massachusetts |
| 69 | Mary A. Mahoney | 39 | Daughter | Office Work | Massachusetts |
| 70 | Margaret G. Mahoney | 33 | Daughter | Operator | Massachusetts |
| 71 | William J. Mahoney THIS PERSON | 31 | Son | Switch Repair | Massachusetts |
| 72 | Michael Norman | 57 | Head | Agent | Irish Free State |
| 73 | Nellie J. Norman | 54 | Wife | — | Irish Free State |
| 74 | Barry F. Norman | 26 | Son | Typographer | Massachusetts |
| 75 | Alice J. Norman | 24 | Daughter | Compositor | Massachusetts |
| 76 | Carroll J. Norman | 23 | Son | Clerk-Office | Massachusetts |
| 77 | Julie D. Norman | 21 | Daughter | Operator | Massachusetts |
| 78 | Eleanor B. Norman | 19 | Daughter | Stenographer | Massachusetts |
| 79 | Michael J. Norman | 17 | Son | — | Massachusetts |
| 80 | Mary Murphy | 45 | Roomer | — | Irish Free State |
| 81 | Edward J. Conighan | 35 | Head | Sheet Metal Worker | Pennsylvania |
| 82 | Loretta E. Conighan | 33 | Wife | — | Massachusetts |
| 83 | Max Doctoroff | 53 | Head | Tailor | Russia |
| 84 | Esther Doctoroff | 52 | Wife | — | Russia |
| 85 | Isadore Doctoroff | 24 | Son | Manager | Massachusetts |
| 86 | Samuel Doctoroff | 22 | Son | Fireman | Massachusetts |
| 87 | Rebecca Cooper | 79 | Mother-in-law | — | Russia |
| 88 | Thomas J. Maloney | 32 | Head | Fireman | Massachusetts |
| 89 | Georgia Maloney | 35 | Wife | — | Massachusetts |
| 90 | Thomas J. Jr. Maloney | 10 | Son | — | Massachusetts |
| 91 | William J. Wilson | 45 | Head | Carpenter | Canada English |
| 92 | Ellen A. Wilson | 50 | Wife | — | Massachusetts |
| 93 | William J. Wilson | 22 | Son | Shipper | Massachusetts |
| 94 | Thomas F. Wilson | 21 | Son | Chauffeur | Massachusetts |
| 95 | Robert P. Wilson | 17 | Son | — | Massachusetts |
| 96 | Thomas J. Prior | 71 | Father-in-law | — | Massachusetts |
| 97 | James Mccellen | 40 | Head | Waitress | Irish Free State |
| 98 | Rose Mccellen | 44 | Sister | Cook | Irish Free State |
| 99 | Mary Mccellen | 42 | Sister | Stenographer | Irish Free State |
| 100 | Ellen Mccellen | 30 | Sister | Cook | Irish Free State |
Pedigree Summary
William + 3 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)