JC
John Connolly — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Suffolk, Massachusetts
Our Model Tree links this John Connolly across the 1930 and 1940 US Censuses in Suffolk, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 12-person household.
Age 15
b. ~1915
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Suffolk, Massachusetts |
| Surname | Connolly |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City Of |
| 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.
12 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Connolly | Daughter | — | 23 | ~1907 |
| Agnes Connolly | Daughter | — | 13 | ~1917 |
| Joseph Connolly | Son | — | 16 | ~1914 |
| Annie Connolly | Other | — | 42 | ~1888 |
| Helen Connolly | Daughter | — | 6 | ~1924 |
| John Connolly | Son | — | 15 | ~1915 |
| William Connolly | Son | — | 8 | ~1922 |
| Annie Connolly | Daughter | — | 22 | ~1908 |
| Catherine Connolly | Daughter | — | 11 | ~1919 |
| Patrick Connolly | Head | — | 45 | ~1885 |
| Agnes Connolly | Daughter | — | 4 | ~1926 |
| Claire Connolly | Daughter | — | ~1930 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 15
Suffolk, Massachusetts · implied b. ~1915 — 12 household members
| Surname | Connolly |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Other, age 26
Suffolk-County, Massachusetts · implied b. ~1914 — 40 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connelly |
| Given Name | John |
| Relationship to Head | Lodger |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| Occupation | Salesman |
| Industry | Wholesale Jewelry |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 1700 |
| Highest Grade | H-1 |
| 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 John Connolly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Connolly
Son · 1930 · age 15 · b. ~1915 · Massachusetts
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Sibling
Agnes Connolly
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Claire Connolly
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Connolly
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Connolly
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Connolly
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Annie Connolly
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Agnes Connolly
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Connolly
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Connolly
Sibling · 1930 · age 23
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:massachusettscensus00reel946:0665)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Claire M. Roche | 27 | Daughter | None | Massachusetts |
| 52 | Doris M. Roche | 17 | Daughter | None | Massachusetts |
| 53 | Raymond Macdonald | 23 | Boarder | Laborer | Canada English |
| 54 | Thomas J. Ryan | 36 | Head | Chauffeur | Massachusetts |
| 55 | Catherine V. Ryan | 32 | Wife-H | None | Massachusetts |
| 56 | Joseph J. Ryan | 9 | Son | — | Massachusetts |
| 57 | Thomas J. Ryan | 7 | Son | None | Massachusetts |
| 58 | Mary C. Ryan | 0 | Daughter | None | Massachusetts |
| 59 | Thomas H. White | 37 | Head | Conductor | Massachusetts |
| 60 | Hannah White | 33 | Wife-H | — | Massachusetts |
| 61 | Helen White | 8 | Daughter | — | Massachusetts |
| 62 | Joseph White | 3 | Son | None | Massachusetts |
| 63 | Margaret Flaherty | 56 | Head | — | Irish Free State |
| 64 | Daniel J. Flaherty | 21 | Son | Salesman | Massachusetts |
| 65 | William Flaherty | 19 | Son | Helper Boy | Massachusetts |
| 66 | James J. Mahoney | 34 | Head | Asst Yard Master | Massachusetts |
| 67 | Josephine C. Mahoney | 34 | Wife-H | — | Massachusetts |
| 68 | Mary E. Mahoney | 14 | Daughter | — | Massachusetts |
| 69 | Josephine C. Mahoney | 12 | Daughter | — | Massachusetts |
| 70 | James J. Mahoney | 10 | Son | None | Massachusetts |
| 71 | Thomas E. Mahoney | 7 | Son | None | Massachusetts |
| 72 | Mary C. Rice | 4 | Daughter | None | Lithuania |
| 73 | Patrick J. Mahoney | 51 | Head | Laborer | Irish Free State |
| 74 | Delia Mahoney | 47 | Wife-H | — | Irish Free State |
| 75 | John J. Mahoney | 20 | Son | Shipper | Massachusetts |
| 76 | Mary E. Mahoney | 19 | Daughter | — | Massachusetts |
| 77 | Margaret R. Mahoney | 17 | Daughter | Machinist | Massachusetts |
| 78 | Thomas J. Mahoney | 15 | Son | — | Massachusetts |
| 79 | Michael Ginsy | 47 | Head | Tailor | Lithuania |
| 80 | Anna Ginsy | 46 | Wife-H | — | Lithuania |
| 81 | Isabel M. Ginsy | 23 | Daughter | Bookkeeper | Lithuania |
| 82 | Anna M. Ginsy | 20 | Daughter | — | Massachusetts |
| 83 | John Mackinekas | 58 | Head | Press Machinist | Lithuania |
| 84 | Antoinette Mackinekas | 40 | Wife-H | — | Lithuania |
| 85 | Patrick Connolly | 45 | Head | Laborer | Irish Free State |
| 86 | Annie Connolly | 42 | Wife-H | — | Irish Free State |
| 87 | Mary E. Connolly | 23 | Daughter | Inspector | Massachusetts |
| 88 | Annie Connolly | 22 | Daughter | Printer | Massachusetts |
| 89 | Joseph Connolly | 16 | Son | — | Massachusetts |
| 90 | John Connolly THIS PERSON | 15 | Son | — | Massachusetts |
| 91 | Agnes Connolly | 13 | Daughter | None | Massachusetts |
| 92 | Catherine Connolly | 11 | Daughter | None | Massachusetts |
| 93 | William Connolly | 8 | Son | None | Massachusetts |
| 94 | Helen Connolly | 6 | Daughter | None | Massachusetts |
| 95 | Agnes Connolly | 4 | Daughter | None | Massachusetts |
| 96 | Claire M. Connolly | 0 | Daughter | None | Massachusetts |
| 97 | John J. Gibbons | 23 | Head | Shoe Worker | Massachusetts |
| 98 | Annie Gibbons | 24 | Wife-H | — | Scotland |
| 99 | Annie Gibbons | 1 | Daughter | None | Massachusetts |
| 100 | Paul Maskus | 36 | Head | Cook | Lithuania |
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)