MD
Mary Duffy — 1930 US Census Record
Model Tree available1930 United States Federal Census · Union, New Jersey
Our Model Tree links this Mary Duffy across the 1920, 1930 and 1940 US Censuses in Union, New Jersey (XGBoost, ~Confirmed), with identified parents Nellie & Mary — first a daughter (b.~1908), then head of a 7-person household.
Age 22
b. ~1908
Female
Daughter
Born: New Jersey
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Union, New Jersey |
| Surname | Duffy |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New York |
| Mother's Birthplace | New York State |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | City Of Elizabeth |
| Est. Birth Year | ~1908 |
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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Margaret Duffy | Daughter | — | 26 | ~1904 |
| Mary Duffy | Daughter | — | 22 | ~1908 |
| Eleanor Duffy | Daughter | — | 19 | ~1911 |
| Mary Duffy | Head | — | 57 | ~1873 |
| Ellen Duffy | Other | — | 54 | ~1876 |
| Joseph Dolan | Other | — | 24 | ~1906 |
| Frank Duffy | Son | — | 24 | ~1906 |
Census Appearances
1920
Union, New …
Daughter, age 12
Union, New Jersey · implied b. ~1908 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New York |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Union, New …
Daughter, age 22
Union, New Jersey · implied b. ~1908 — 7 household members
| Surname | Duffy |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New York |
| Mother's Birthplace | New York State |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
Daughter, age 33
Union-County, New Jersey · implied b. ~1907 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Margaret E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Elizabeth City |
| Occupation | File Clerk |
| Industry | Bank |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1620 |
| Highest Grade | H-4 |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 Mary Duffy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Nellie Duffy (~0.92 confidence) and mother Mary Duffy (~0.92 confidence) and father George Duffy (~0.92 confidence) and father George Duffy (~0.92 confidence) and mother Ellen Duffy (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Nellie Duffy
b. ~1872
Source mother
● Household
· direct · ~0.92
Mother
Mary Duffy
b. ~1873
Source mother
● Household
· direct · ~0.92
Father
George Duffy
b. ~1876
Source father
● Household
· direct · ~0.92
Father
George Duffy
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Ellen Duffy
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Duffy
Daughter · 1930 · age 22 · b. ~1908 · New Jersey
★ You are viewing this record
Sibling
Eleanor Duffy
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Duffy
Sibling · 1930 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Duffy
Sibling · 1930 · age 24
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 — Union, New Jersey
Open full size
1930 US Federal Census — Union, New Jersey
Page Contents
50 people indexed on this census page (ia:1930:newjerseycensus00reel1387:0160)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Annie B Pearson | 70 | Wife | — | New Jersey |
| 52 | Emma Stephens | 72 | Head | Lodging House Keeper | Connecticut |
| 53 | Henry Mitchell | 68 | Boarder | Watchman | East India |
| 54 | Martha P. Smith | 55 | Head | Teacher | New Jersey |
| 55 | Alice C. Rogers | 47 | Head | — | New Jersey |
| 56 | Stella F. Rogers | 54 | Wife-H | Saleswoman | New York |
| 57 | Robert J. Jr. Vance | 11 | Step-son | — | New Jersey |
| 58 | Gordon R. Vance | 5 | Step-son | — | New Jersey |
| 59 | David Wilson | 40 | Head | Carpenter | Scotland |
| 60 | Grace Wilson | 40 | Wife-H | — | Pennsylvania |
| 61 | Ivan Wilson | 18 | Son | — | Pennsylvania |
| 62 | Wallace Wilson | 8 | Son | — | New Jersey |
| 63 | Concheta Scoda | 42 | Head-H | — | Italy |
| 64 | Angelina Scoda | 18 | Niece | — | New Jersey |
| 65 | Mary F. Duffy | 57 | Head | Dressmaker | New York |
| 66 | Ellen Duffy | 54 | Sister | Bookkeeper | New York State |
| 67 | Margaret Duffy | 26 | Daughter | — | New Jersey |
| 68 | Frank Duffy | 24 | Son | Bond Trading Clerk | New Jersey |
| 69 | Mary L. Duffy THIS PERSON | 22 | Daughter | — | New Jersey |
| 70 | Eleanor Duffy | 19 | Daughter | Bond Clerk | New Jersey |
| 71 | Joseph Dolan | 24 | Lodger | Training Service | New York State |
| 72 | William H. Keelen | 56 | Head | Carpenter | New York |
| 73 | Kate Keelen | 55 | Wife-H | Dressmaker | New York |
| 74 | Arthur W. Keelen | 24 | Son | — | New York |
| 75 | Gertrude Keelen | 24 | Daughter | Dressmaker | New York |
| 76 | Edwin Keelen | 21 | Son | Stenographer | New York |
| 77 | Melvin Keelen | 18 | Son | Architect | New Jersey |
| 78 | James F. Hunter | 38 | Head | Assembler | New Jersey |
| 79 | Agnes Hunter | 41 | Wife-H | Electrician | New Jersey |
| 80 | Mary Hunter | 16 | Daughter | — | New Jersey |
| 81 | Margaret Hunter | 15 | Daughter | Stenographer | New Jersey |
| 82 | Ruth Hunter | 13 | Daughter | — | New Jersey |
| 83 | James Jr. Hunter | 10 | Son | — | New Jersey |
| 84 | Theodore Hunter | 9 | Son | — | New Jersey |
| 85 | John Hunter | 7 | Son | — | New Jersey |
| 86 | Julia Kelley | 40 | Head-H | Lodging House Keeper | Ireland-Cork |
| 87 | Grace Kelley | 7 | Daughter | — | New Jersey |
| 88 | Margaret M. Kelley | 5 | Daughter | — | New Jersey |
| 89 | Paul Bauer | 26 | Lodger | Engineer | Germany |
| 90 | Philip Bauer | 23 | Lodger | Engineer | Germany |
| 91 | Joseph Boyle | 36 | Head | Laborer | Scotland |
| 92 | Charles A. Rhodes | 37 | Head | Machinist | New York |
| 93 | Gladys E. Rhodes | 37 | Wife-H | — | New York |
| 94 | Hilda F. Rhodes | 7 | Daughter | — | Pennsylvania |
| 95 | James French | 51 | Head | Clerk-Billing | New Jersey |
| 96 | Gertrude French | 47 | Wife-H | — | New York State |
| 97 | Gertrude French | 20 | Daughter | Clerk-Typist | New Jersey |
| 98 | George J. Fink | 47 | Head | Manager | New Jersey |
| 99 | Martha Fink | 44 | Wife-H | — | Germany |
| 100 | George Jr. Fink | 14 | Son | — | New Jersey |
Related Census Records
Pedigree Summary
Mary + 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)