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John Mcnamara — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this John Mcnamara across the 1910, 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1907), then head of a 12-person household.
Age 23
b. ~1907
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | McNamara |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Maine |
| Additional Details | |
| Occupation | Inspector |
| Industry | Rubber Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Inspector |
| Township / Ward | Waltham City |
| Est. Birth Year | ~1907 |
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.
12 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Helen Mcnamara | Daughter | — | 20 | ~1910 |
| Margaret Mcnamara | Daughter | — | 12 | ~1918 |
| John Mcnamara | Head | — | 56 | ~1874 |
| Bertha Mcnamara | Other | — | 47 | ~1883 |
| Lincoln Mccullough | Other | — | 32 | ~1898 |
| Dorothy Mccullough | Other | — | 26 | ~1904 |
| Lawrence Mcnamara | Son | — | 18 | ~1912 |
| Francis Mcnamara | Son | — | 22 | ~1908 |
| John Mcnamara | Son | — | 23 | ~1907 |
| Gerald Mcnamara | Son | — | 8 | ~1922 |
| Richard Mcnamara | Son | — | 10 | ~1920 |
| Henry Mcnamara | Son | — | 17 | ~1913 |
Census Appearances
1910
Middlesex, Massachusetts
Son, age 3
Middlesex, Massachusetts · implied b. ~1907 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McNamara |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Maine |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Middlesex, Massachusetts
Son, age 13
Middlesex, Massachusetts · implied b. ~1907 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McNamara |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Maine |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 23
Middlesex, Massachusetts · implied b. ~1907 — 12 household members
| Surname | McNamara |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Maine |
| Occupation | Inspector |
| Industry | Rubber Factory |
| 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 John Mcnamara across 3 US Census years (1910, 1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage. Identified parents: father John Mcnamara (~0.92 confidence) and father John Mcnamara (~0.92 confidence) and mother Bertha Mcnamara (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Mcnamara
b. ~1873
Source father
● Household
· direct · ~0.92
Father
John Mcnamara
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Bertha Mcnamara
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mcnamara
Son · 1930 · age 23 · b. ~1907 · Massachusetts
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Sibling
Lawrence Mcnamara
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henry Mcnamara
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gerald Mcnamara
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Mcnamara
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mcnamara
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Mcnamara
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Mcnamara
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 — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel930:0367)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Arthur Power | 10 | Son | — | Massachusetts |
| 52 | Katherine Power | 7 | Daughter | — | Massachusetts |
| 53 | Patricia Power | 5 | Daughter | — | Massachusetts |
| 54 | William Power | 2 | Son | — | Massachusetts |
| 55 | John W. Lally | 74 | Head | Watch Maker | Massachusetts |
| 56 | Winifred Lally | 64 | Wife-H | — | Massachusetts |
| 57 | Lucille Lally | 32 | Daughter | Asst. Book-Keeper | Massachusetts |
| 58 | Frank J. Lally | 40 | Son | Watch Maker | Massachusetts |
| 59 | Gertrude St. George | 46 | Daughter | Dressmaker | Massachusetts |
| 60 | Ottoson Ottoson | 32 | Boarder | Manager | Massachusetts |
| 61 | Earl Ottoson | 5 | Boarder | — | Massachusetts |
| 62 | John Mcnamara | 56 | Head | Watch Maker | Massachusetts |
| 63 | Bertha Mcnamara | 47 | Wife-H | — | Maine |
| 64 | John Mcnamara THIS PERSON | 23 | Son | Inspector | Massachusetts |
| 65 | Francis Mcnamara | 22 | Son | Clerk | Massachusetts |
| 66 | Helen Mcnamara | 20 | Daughter | Inspector | Massachusetts |
| 67 | Lawrence Mcnamara | 18 | Son | Time Keeper | Massachusetts |
| 68 | Henry Mcnamara | 17 | Son | — | Massachusetts |
| 69 | Margaret Mcnamara | 12 | Daughter | — | Massachusetts |
| 70 | Richard Mcnamara | 10 | Son | — | Massachusetts |
| 71 | Gerald Mcnamara | 8 | Son | — | Massachusetts |
| 72 | Lincoln Mccullough | 32 | Lodger | Entertainer | Massachusetts |
| 73 | Dorothy Mccullough | 26 | Lodger | Entertainer | Massachusetts |
| 74 | John Moyse | 46 | Head | Laborer | Russia |
| 75 | Idelia Moyse | 43 | Wife-H | — | Massachusetts |
| 76 | John Moyse | 2 | Son | — | Massachusetts |
| 77 | Harriett Moyse | 7 | Daughter | — | Massachusetts |
| 78 | Catherine Moyse | 15 | Daughter | — | Massachusetts |
| 79 | William Powers | 55 | Head | Finisher | Massachusetts |
| 80 | Margaret Powers | 55 | Wife-H | — | Massachusetts |
| 81 | Catherine Gordon | 52 | Sister-in-law | — | Massachusetts |
| 82 | James Costello | 67 | Cousin | — | Massachusetts |
| 83 | Joanna Clifford | 69 | Head-H | — | Massachusetts |
| 84 | Augustus Nicho | 65 | Head | Carpenter | Canada French |
| 85 | Celina Nicho | 60 | Wife-H | — | New York State |
| 86 | Joseph Nicho | 33 | Son | — | Massachusetts |
| 87 | William Thompson | 75 | Head | Laborer | Canada English |
| 88 | Mary Thompson | 65 | Wife-H | — | Canada English |
| 89 | Robert Thompson | 44 | Son | — | Massachusetts |
| 90 | John Thompson | 42 | Son | Helper | Massachusetts |
| 91 | Katherine Thompson | 36 | Daughter | Stenographer | Massachusetts |
| 92 | William Thompson | 34 | Son | Laborer | Massachusetts |
| 93 | James Thompson | 32 | Son | Laborer | Massachusetts |
| 94 | George Thompson | 28 | Son | Laborer | Massachusetts |
| 95 | Eva Wolfe | 43 | Head-H | — | Russia |
| 96 | Arthur Wolfe | 20 | Son | — | Massachusetts |
| 97 | Jeanette Wolfe | 12 | Daughter | — | Massachusetts |
| 98 | James B. Delaney | 62 | Head | Mason | Irish Free State |
| 99 | Margaret Delaney | 64 | Wife-H | — | Irish Free State |
| 100 | James Delaney | 35 | Son | Milkman | Massachusetts |
Related Census Records
Pedigree Summary
John + 7 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)