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Mary Mcnamara — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Mcnamara across the 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1915), then head of a 10-person household.
Age 15
b. ~1915
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | McNamara |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Arlington Town |
| Est. Birth Year | ~1915 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Helen Mcnamara | Daughter | — | 13 | ~1917 |
| Mary Mcnamara | Daughter | — | 15 | ~1915 |
| Margaret Mcnamara | Daughter | — | 7 | ~1923 |
| Catherine Mcnamara | Daughter | — | 6 | ~1924 |
| Joseph Mcnamara | Head | — | 40 | ~1890 |
| Eleanor Mcnamara | Other | — | 43 | ~1887 |
| John Mcnamara | Son | — | 9 | ~1921 |
| George Mcnamara | Son | — | 17 | ~1913 |
| Joseph Mcnamara | Son | — | 3 | ~1927 |
| Margaret Mcnamara | Spouse | — | 34 | ~1896 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 5
Middlesex, Massachusetts · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McNamara |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 15
Middlesex, Massachusetts · implied b. ~1915 — 10 household members
| Surname | McNamara |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| 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 Mary Mcnamara across 2 US Census years (1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcnamara
Daughter · 1930 · age 15 · b. ~1915 · Massachusetts
★ You are viewing this record
Sibling
Joseph Mcnamara
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Mcnamara
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Mcnamara
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Mcnamara
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mcnamara
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcnamara
Sibling · 1930 · age 9
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:massachusettscensus00reel913:0901)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jean M Forbes | 45 | Wife | — | Canada |
| 2 | George Forbes | 14 | Son | — | Massachusetts |
| 3 | Thomas F Clifford | 31 | Head | Truck Driver | Massachusetts |
| 4 | Esther Clifford | 29 | Wife | — | Massachusetts |
| 5 | Thomas F Jr Clifford | 5 | Son | — | Massachusetts |
| 6 | William E Clifford | 3 | Son | — | Massachusetts |
| 7 | Stephen C Hatch | 33 | Head | Manager | Maine |
| 8 | Mary Hatch | 32 | Wife | — | Massachusetts |
| 9 | Stephen Hatch | 8 | Son | — | Massachusetts |
| 10 | Dorothy Hatch | 22 | Sister | Clerk | Maine |
| 11 | Thomas Mcgovern | 32 | Head | Clerk | Massachusetts |
| 12 | Mary Mcgovern | 30 | Wife | Operator | Massachusetts |
| 13 | M Arthur Monks | 32 | Head | Office Manager | Massachusetts |
| 14 | Dorothy Monks | 33 | Wife | — | Massachusetts |
| 15 | Arthur Monks | 8 | Son | — | Massachusetts |
| 16 | Benjamin Monks | 6 | Son | — | Massachusetts |
| 17 | Edward H Lynch | 35 | Head | Mechanic | Massachusetts |
| 18 | Madeline Lynch | 35 | Wife | — | Massachusetts |
| 19 | Edward H Lynch | 5 | Son | — | Massachusetts |
| 20 | John C Younker | 52 | Father-in-law | Salesman | Canada |
| 21 | Mary M Younker | 47 | Mother-in-law | — | Massachusetts |
| 22 | Edmund Younker | 21 | Brother-in-law | Shipper | Massachusetts |
| 23 | William Duty | 67 | Head | Machinist | Scotland |
| 24 | Elsie Duty | 66 | Wife | — | Scotland |
| 25 | Thomas Welch | 60 | Father-in-law | Salesman | Scotland |
| 26 | Joseph Mcnamara | 40 | Head | Salesman | Massachusetts |
| 27 | Margaret E Mcnamara | 34 | Wife | — | Massachusetts |
| 28 | George Mcnamara | 17 | Son | — | Massachusetts |
| 29 | Mary Mcnamara THIS PERSON | 15 | Daughter | — | Massachusetts |
| 30 | Helen Mcnamara | 13 | Daughter | — | Massachusetts |
| 31 | John Mcnamara | 9 | Son | — | Massachusetts |
| 32 | Margaret Mcnamara | 7 | Daughter | — | Massachusetts |
| 33 | Catherine Mcnamara | 6 | Daughter | — | Massachusetts |
| 34 | Joseph Mcnamara | 3 | Son | — | Massachusetts |
| 35 | Eleanor H Mcnamara | 43 | Sister | Cashier | Massachusetts |
| 36 | Louis E Lowe | 56 | Head | Stationary Engineer | Massachusetts |
| 37 | Minnetta Lowe | 54 | Wife | — | New York |
| 38 | Tyler E Lowe | 16 | Son | — | Massachusetts |
| 39 | Thomas Masone | 55 | Head | — | Italy |
| 40 | Anna Masone | 52 | Wife | — | Italy |
| 41 | Thomas Masone | 18 | Son | Barber | Massachusetts |
| 42 | Mary Masone | 27 | Daughter | Shoe Worker | Italy |
| 43 | Albert Masone | 10 | Son | — | Massachusetts |
| 44 | Mary J Louth | 61 | Head | — | Canada |
| 45 | Lucy F Louth | 36 | Daughter | — | Canada |
| 46 | George H Louth | 30 | Son | Mechanic | Canada |
| 47 | Wallace Louth | 25 | Son | Carpenter | Canada |
| 48 | Frances Louth | 22 | Daughter | Clerk | Canada |
| 49 | Alex Young | 41 | Roomer | — | Massachusetts |
| 50 | Gertrude Dunnell | 50 | Head | — | England |
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)