JC
John Cahill — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Essex, New Jersey
Our Model Tree links this John Cahill across the 1920 and 1930 US Censuses in Essex, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1908), then head of a 11-person household.
Age 22
b. ~1908
Male
Son
Born: New Jersey
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Essex, New Jersey |
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Additional Details | |
| Occupation | Draftsman |
| Industry | Power Plant |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Draftsman |
| Township / Ward | Newark City |
| 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.
11 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Piotkiewicz | Other | — | 45 | ~1885 |
| John Cahill | Son | — | 22 | ~1908 |
| William Cahill | Son | — | 16 | ~1914 |
| Josephine Piotkiewicz | Daughter | — | 19 | ~1911 |
| Victor Piotkiewicz | Son | — | 22 | ~1908 |
| Felix Piotkiewicz | Head | — | 48 | ~1882 |
| Mary Cahill | Other | — | 46 | ~1884 |
| Irene Cahill | Daughter | — | 19 | ~1911 |
| Marie Cahill | Daughter | — | 17 | ~1913 |
| Edward Cahill | Son | — | 14 | ~1916 |
| Catherine Cahill | Daughter | — | 21 | ~1909 |
Census Appearances
1920
Essex, New …
Son, age 11
Essex, New Jersey · implied b. ~1909 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | John J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Essex, New …
Son, age 22
Essex, New Jersey · implied b. ~1908 — 11 household members
| Surname | Cahill |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Occupation | Draftsman |
| Industry | Power Plant |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 John Cahill across 2 US Census years (1920 and 1930) in Essex, New Jersey, using XGBoost record linkage.
Show:
This person
Anchor record
John Cahill
Son · 1930 · age 22 · b. ~1908 · New Jersey
★ You are viewing this record
Sibling
Edward Cahill
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Victor Piotkiewicz
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cahill
Sibling · 1930 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Piotkiewicz
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Cahill
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Cahill
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Cahill
Sibling · 1930 · age 16
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 — Essex, New Jersey
Open full size
1930 US Federal Census — Essex, New Jersey
Page Contents
50 people indexed on this census page (ia:1930:newjerseycensus00reel1342:0400)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Joseph A. O'Donnell | 38 | Head | Postal Clerk | New York |
| 52 | Anna O'Donnell | 38 | Wife-H | — | Irish Free State |
| 53 | Florence O'Donnell | 14 | Daughter | — | New York |
| 54 | Joseph O'Donnell | 12 | Son | — | New York |
| 55 | James O'Donnell | 10 | Son | — | New Jersey |
| 56 | Frank Lambrecht | 28 | Head | Clerk | New York |
| 57 | Loretta Lambrecht | 31 | Wife-H | — | New Jersey |
| 58 | Joan Lambrecht | 2 | Daughter | — | New Jersey |
| 59 | Joseph Dzitko | 26 | Head | Laundryman | New Jersey |
| 60 | Charles Dzitko | 21 | Brother | Laundryman | New Jersey |
| 61 | Victor Dzitko | 18 | Brother | Orderly | New Jersey |
| 62 | Anna Vilekka | 20 | Sister-H | Housekeeper | New Jersey |
| 63 | Walter Vilekka | 22 | Brother-in-law | Packer | New Jersey |
| 64 | William Mazey | 42 | Head | Stock Clerk | Pennsylvania |
| 65 | May Mazey | 48 | Wife-H | — | Pennsylvania |
| 66 | Richard Mazey | 20 | Son | Clerk | Pennsylvania |
| 67 | Laverne Mazey | 18 | Son | Clerk | Pennsylvania |
| 68 | Jack Mazey | 11 | Son | — | Pennsylvania |
| 69 | William Mazey | 13 | Son | — | Pennsylvania |
| 70 | Sam Sobolewski | 54 | Head | Blacksmith | Poland |
| 71 | Wanda Sobolewski | 49 | Wife-H | — | Poland |
| 72 | Stanley Ignaczak | 28 | Adopted Son | Knitter | Poland |
| 73 | Jennie Ignaczak | 22 | Adopted Daughter | Operator | New Jersey |
| 74 | Alexander Sobolewski | 15 | Son | — | New Jersey |
| 75 | Fred M. Wroell | 55 | Head | Shipping Clerk | New Jersey |
| 76 | Louise Wroell | 52 | Wife-H | — | New Jersey |
| 77 | Theodore Wroell | 27 | Son | Clerk | New Jersey |
| 78 | Arthur Wroell | 21 | Son | Clerk | New Jersey |
| 79 | Fred Reach | 29 | Head | Driver | New Jersey |
| 80 | Margaret Reach | 24 | Wife-H | — | New Jersey |
| 81 | Evelyn Reach | 3 | Daughter | — | New Jersey |
| 82 | Frederick Reach | 1 | Son | — | New Jersey |
| 83 | Charles Karcher | 64 | Father | Yes | Germany |
| 84 | Catherine Karcher | 62 | Mother | — | New Jersey |
| 85 | Stanley Bdzulko | 39 | Head | Carpenter | Poland |
| 86 | Helen Bdzulko | 38 | Wife-H | — | Poland |
| 87 | Stella Bdzulko | 14 | Daughter | — | New Jersey |
| 88 | Henry Bdzulko | 10 | Son | — | New Jersey |
| 89 | Josephine Bannon | 32 | Sister | Binder | Poland |
| 90 | Felix Piotkiewicz | 48 | Head | Bag-Maker | Poland |
| 91 | Mary Piotkiewicz | 45 | Wife-H | — | Poland |
| 92 | Victor Piotkiewicz | 22 | Son | Photographer | New Jersey |
| 93 | Josephine Piotkiewicz | 19 | Daughter | Bookkeeper | New Jersey |
| 94 | Mary E. Cahill | 46 | — | — | New Jersey |
| 95 | John Cahill THIS PERSON | 22 | Son | Draftsman | New Jersey |
| 96 | Catherine Cahill | 21 | Daughter | Stenographer | New Jersey |
| 97 | Irene Cahill | 19 | Daughter | Stenographer | New Jersey |
| 98 | Marie Cahill | 17 | Daughter | Stenographer | New Jersey |
| 99 | William Cahill | 16 | Son | Clerk | New Jersey |
| 100 | Edward Cahill | 14 | Son | — | New Jersey |
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)