JC
John Costello — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this John Costello across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a son (b.~1909), then head of a 9-person household.
Age 21
b. ~1909
Male
Son
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Costello |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Free State |
| Mother's Birthplace | Free State |
| Additional Details | |
| Occupation | Clerk |
| Industry | Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Clerk |
| Township / Ward | Chicago |
| Est. Birth Year | ~1909 |
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.
9 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Costello | Son | — | 21 | ~1909 |
| Joe Costello | Son | — | 12 | ~1918 |
| Frank Costello | Head | — | 50 | ~1880 |
| Honora Costello | Daughter | — | 19 | ~1911 |
| Sarah Costello | Spouse | — | 46 | ~1884 |
| Matthew Costello | Son | — | 17 | ~1913 |
| Lawrence Costello | Son | — | 10 | ~1920 |
| Vincent Costello | Son | — | 15 | ~1915 |
| Mary Costello | Daughter | — | 23 | ~1907 |
Census Appearances
1930
Cook, Illinois
Son, age 21
Cook, Illinois · implied b. ~1909 — 9 household members
| Surname | Costello |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Free State |
| Mother's Birthplace | Free State |
| Occupation | Clerk |
| Industry | Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 31
Cook-County, Illinois · implied b. ~1909 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Castello |
| Given Name | John S. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Adjuster |
| Industry | Insurance |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 2748 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Costello across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Costello
Son · 1930 · age 21 · b. ~1909 · Illinois
★ You are viewing this record
Sibling
Honora Costello
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joe Costello
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Costello
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Matthew Costello
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Vincent Costello
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Costello
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 — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
49 people indexed on this census page (ia:1930:illinoiscensus00reel454:0820)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Frank Costello | 50 | Head | — | Free State |
| 52 | Sarah Costello | 46 | Wife | — | Illinois |
| 53 | Mary Costello | 23 | Daughter | Clerk | Illinois |
| 54 | John Costello THIS PERSON | 21 | Son | Clerk | Illinois |
| 55 | Honora Costello | 19 | Daughter | Clerk | Illinois |
| 56 | Matthew Costello | 17 | Son | Messenger | Illinois |
| 57 | Vincent Costello | 15 | Son | — | Illinois |
| 58 | Joe Costello | 12 | Son | — | Illinois |
| 59 | Lawrence Costello | 10 | Son | — | Illinois |
| 60 | Owen Lynch | 35 | Head | Laborer | Free State |
| 61 | Mary Lynch | 29 | Wife | — | Free State |
| 62 | Mary Agnes Lynch | 3 | Daughter | — | Illinois |
| 63 | Lawrence Lynch | 2 | Son | — | Illinois |
| 64 | Patrick Joe Lynch | 0 | Son | — | Illinois |
| 65 | Timothy Sullivan | 25 | Boarder | Laborer | Free State |
| 66 | Albert Duggan | 57 | Boarder | Carpenter | Illinois |
| 67 | Elizabeth Duggan | 56 | Wife | — | Ohio |
| 68 | James Mullins | 27 | Head | Clerk | New York |
| 69 | Hannah Mullins | 23 | Wife | — | Illinois |
| 70 | Robert Mullins | 1 | Son | — | Illinois |
| 71 | Mary Mullins | 56 | Mother | — | Free State |
| 72 | Joe Janovitz | 49 | Head | Merchant | Russia |
| 73 | Rebecca Janovitz | 47 | Wife | — | Russia |
| 74 | Morris Janovitz | 22 | Son | — | Illinois |
| 75 | Rose Janovitz | 21 | Daughter | Stenographer | Illinois |
| 76 | Harry Janovitz | 14 | Son | — | Illinois |
| 77 | Rebecca Lewis | 42 | Wife | — | England |
| 78 | Myron Lewis | 23 | Son | — | Illinois |
| 79 | Marion Lewis | 17 | Daughter | Saleslady | Illinois |
| 80 | Ben Krieman | 60 | Head | Tailor | Russia |
| 81 | Sarah Krieman | 50 | Wife | — | Russia |
| 82 | Harry Krieman | 25 | Son | Tailor | Russia |
| 83 | Jeanette Krieman | 20 | Daughter | Operator | Russia |
| 84 | Alice Krieman | 14 | Daughter | — | Russia |
| 85 | Edward Krieman | 17 | Son | — | Russia |
| 86 | Jack Krieman | 15 | Son | — | Russia |
| 87 | Emil Stalman | 72 | Head | — | Illinois |
| 88 | Oscar Stalman | 48 | Head | Broker | Illinois |
| 89 | Margaret Stalman | 43 | Wife | — | Illinois |
| 90 | Mildred Stalman | 20 | Daughter | — | Illinois |
| 91 | Margaret Stalman | 17 | Daughter | — | Illinois |
| 92 | Sam Novak | 45 | Head | Tailor | Russia |
| 93 | Celia Novak | 46 | Wife | — | Russia |
| 94 | David Novak | 21 | Son | Optician | Illinois |
| 95 | Philip Novak | 18 | Son | Clerk | Illinois |
| 96 | Amelia Novak | 13 | Daughter | — | Illinois |
| 97 | Rose Sardana | 39 | Head | — | Illinois |
| 98 | Mildred Sardana | 12 | Daughter | — | Illinois |
| 99 | Ruth Sardana | 9 | Daughter | — | Illinois |
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)