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Mary Mcdermott — 1930 US Census Record
Model Tree available1930 United States Federal Census · Suffolk, Massachusetts
Our Model Tree links this Mary Mcdermott across the 1920, 1930 and 1940 US Censuses in Suffolk, Massachusetts (XGBoost, ~Confirmed), with identified parents Thomas & John — first a daughter (b.~1918), then head of a 8-person household.
Age 12
b. ~1918
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Suffolk, Massachusetts |
| Surname | McDermott |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | City Of Boston |
| Est. Birth Year | ~1918 |
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.
8 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcdermott | Daughter | — | 12 | ~1918 |
| Catherine Mcdermott | Daughter | — | 2 | ~1928 |
| Helen Mcdermott | Daughter | — | 6 | ~1924 |
| Annie Mcdermott | Daughter | — | 8 | ~1922 |
| John Mcdermott | Head | — | 43 | ~1887 |
| Annie Mcdermott | Other | — | 42 | ~1888 |
| Thomas Mcdermott | Son | — | 4 | ~1926 |
| John Mcdermott | Son | — | 10 | ~1920 |
Census Appearances
1920
Suffolk, Massachusetts
Daughter, age 1
Suffolk, Massachusetts · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Daughter, age 12
Suffolk, Massachusetts · implied b. ~1918 — 8 household members
| Surname | McDermott |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Spouse, age 23
Suffolk-County, Massachusetts · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Martha |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 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 Mary Mcdermott across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Thomas Mcdermott (~0.92 confidence) and father John Mcdermott (~0.92 confidence) and mother Annie Mcdermott (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Mcdermott
b. ~1864
Source father
● Household
· direct · ~0.92
Father
John Mcdermott
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Annie Mcdermott
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Mcdermott
Daughter · 1930 · age 12 · b. ~1918 · Massachusetts
★ You are viewing this record
Sibling
Catherine Mcdermott
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mcdermott
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Annie Mcdermott
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Mcdermott
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcdermott
Sibling · 1930 · age 10
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
50 people indexed on this census page (ia:1930:massachusettscensus00reel955:0198)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Harry G. Swan | 53 | Head | Mechanical Engineer | Massachusetts |
| 52 | Gertrude Swan | 53 | Wife-H | — | New Hampshire |
| 53 | George F. Carey | 37 | Head | Traffic Officer | Massachusetts |
| 54 | Alice M. Carey | 39 | Wife-H | — | Massachusetts |
| 55 | George F. Carey | 9 | Son | — | Massachusetts |
| 56 | Robert Carey | 7 | Son | — | Massachusetts |
| 57 | Richard Carey | 5 | Son | — | Massachusetts |
| 58 | Mary A. Eaton | 79 | Mother-in-law | — | Massachusetts |
| 59 | James C. Thomas | 31 | Head | Yard Foreman | Scotland |
| 60 | Lillian E. Thomas | 36 | Wife-H | — | Massachusetts |
| 61 | Wilfred Mutch | 37 | Head | Maintenance | Canada English |
| 62 | Elizabeth E. Mutch | 38 | Wife-H | — | Vermont |
| 63 | Catherine R. Mutch | 9 | Daughter | — | Massachusetts |
| 64 | Catherine A. Campbell | 44 | Sister-in-law | Bookkeeper | Vermont |
| 65 | Stanley Mackinnon | 40 | Brother-in-law | Baker'S Helper | Canada English |
| 66 | Milton J. Moser | 65 | Head | Letter Carrier | Massachusetts |
| 67 | Mary E. Moser | 59 | Wife-H | — | Massachusetts |
| 68 | Vincent A. Bolger | 44 | Head | Plumber | Massachusetts |
| 69 | Genevieve R. Bolger | 41 | Wife-H | — | Massachusetts |
| 70 | Vincent A. Bolger | 13 | Son | — | Massachusetts |
| 71 | Daniel F. Rume | 66 | Head | Retired | Massachusetts |
| 72 | Catherine F. Rume | 51 | Wife-H | — | Massachusetts |
| 73 | Agnes M. Rume | 22 | Daughter | Librarian | Massachusetts |
| 74 | John R. Rume | 19 | Son | Clerk | Massachusetts |
| 75 | Eleanor M. Rume | 12 | Daughter | — | Massachusetts |
| 76 | Scott W. Miles | 54 | Head | Painter | Massachusetts |
| 77 | Emily L. Miles | 54 | Wife-H | — | Massachusetts |
| 78 | Ruth B. Miles | 28 | Daughter | — | Massachusetts |
| 79 | Almira P. Mason | 89 | Head | — | Canada English |
| 80 | John J. Mcdermott | 43 | Head | Laborer | Ireland |
| 81 | Annie A. Mcdermott | 42 | Wife-H | — | Ireland |
| 82 | Mary A. Mcdermott THIS PERSON | 12 | Daughter | — | Massachusetts |
| 83 | John J. Mcdermott | 10 | Son | — | Massachusetts |
| 84 | Annie M. Mcdermott | 8 | Daughter | — | Massachusetts |
| 85 | Helen P. Mcdermott | 6 | Daughter | — | Massachusetts |
| 86 | Thomas P. Mcdermott | 4 | Son | — | Massachusetts |
| 87 | Catherine R. Mcdermott | 2 | Daughter | — | Massachusetts |
| 88 | Grace G. Conway | 40 | Head | Cook | Maine |
| 89 | James J. Conway | 9 | Son | — | Massachusetts |
| 90 | Edward Coleman | 59 | Mother-in-law | — | Canada English |
| 91 | Michael Gillis | 45 | Head | Laborer | Irish Free State |
| 92 | Mary Gillis | 45 | Wife-H | — | Irish Free State |
| 93 | Patrick Hines | 34 | Brother-in-law | Caretaker | Irish Free State |
| 94 | Abbie J. Constable | 65 | Head | — | Canada English |
| 95 | George H. Gould | 52 | Head | Chocolate Maker | At Sea |
| 96 | Marion D. Gould | 47 | Wife-H | — | Massachusetts |
| 97 | Margaret Hines | 31 | Sister-in-law | Houseworker | Irish Free State |
| 98 | Carl Freid | 44 | Head | — | Massachusetts |
| 99 | Freid | 44 | Wife-H | — | Massachusetts |
| 100 | Freid | 44 | Wife-H | — | Massachusetts |
Pedigree Summary
Mary + 5 siblings
Gen 1 · 3 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)