JC
John Callahan — 1930 US Census Record
Model Tree available1930 United States Federal Census · Dubuque, Iowa
Our Model Tree links this John Callahan across the 1910, 1920 and 1930 US Censuses in Dubuque, Iowa (XGBoost, ~Confirmed), with identified parents Jas & John — first a son (b.~1905), then head of a 4-person household.
Age 25
b. ~1905
Male
Son
Born: Iowa
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Dubuque, Iowa |
| Surname | Callahan |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Additional Details | |
| Occupation | Polisher |
| Industry | Radio Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Polisher |
| Township / Ward | Dubuque City |
| Est. Birth Year | ~1905 |
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.
4 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Selina Callahan | Head | — | 55 | ~1875 |
| Loras Callahan | Son | — | 20 | ~1910 |
| John Callahan | Son | — | 25 | ~1905 |
| Donald Callahan | Son | — | 16 | ~1914 |
Census Appearances
1910
Dubuque, Iowa
Son, age 5
Dubuque, Iowa · implied b. ~1905 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Dubuque, Iowa
Son, age 14
Dubuque, Iowa · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Dubuque, Iowa
Son, age 25
Dubuque, Iowa · implied b. ~1905 — 4 household members
| Surname | Callahan |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Polisher |
| Industry | Radio Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Callahan across 3 US Census years (1910, 1920 and 1930) in Dubuque, Iowa, using XGBoost record linkage. Identified parents: father Jas Callahan (~0.92 confidence) and father John Callahan (~0.92 confidence) and mother Anna Callahan (~0.92 confidence) and mother Mary Callahan (~0.92 confidence) and mother Selina Callahan (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Jas Callahan
b. ~1867
Source father
● Household
· direct · ~0.92
Father
John Callahan
b. ~1868
Source father
● Household
· direct · ~0.92
Mother
Anna Callahan
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Mary Callahan
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Selina Callahan
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Callahan
Son · 1930 · age 25 · b. ~1905 · Iowa
★ You are viewing this record
Sibling
Loras Callahan
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Callahan
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 — Dubuque, Iowa
Open full size
1930 US Federal Census — Dubuque, Iowa
Page Contents
50 people indexed on this census page (ia:1930:iowacensus00reel653:0906)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rath Edith B. Roth | 43 | Daughter | None | Iowa |
| 2 | Pronga Hilma Roth | 36 | Servant | Servant | Iowa |
| 3 | Maurice A. Beindorf | 47 | Head | Proprietor | Hungary |
| 4 | Rose Beindorf | 41 | Wife | None | Hungary |
| 5 | Annie L. Beindorf | 21 | Daughter | Typing | Iowa |
| 6 | Lillian M. Beindorf | 16 | Daughter | None | Iowa |
| 7 | Sylvia J. Beindorf | 12 | Daughter | None | Iowa |
| 8 | Payton Berg | 42 | Head | Reporter | Pennsylvania |
| 9 | Helen A. Berg | 33 | Wife | None | Iowa |
| 10 | Maurice P. Berg | 13 | Son | None | Iowa |
| 11 | Harry E. Berg | 9 | Son | None | Iowa |
| 12 | James E. O'Connor | 64 | Head | Carpenter | Iowa |
| 13 | Marguerite O'Connor | 60 | Wife | None | Iowa |
| 14 | Joseph J. O'Connor | 30 | Son | Night Watchman | Wisconsin |
| 15 | Marian M. O'Connor | 28 | Daughter | Stenographer | Iowa |
| 16 | Howard J. O'Connor | 25 | Son | Carrier Painting | Iowa |
| 17 | Clement D. O'Connor | 20 | Son | Bell Hop | Iowa |
| 18 | Louise Weber | 66 | Head | None | France |
| 19 | Frank P. Mcdermott | 57 | Head | Laborer | Iowa |
| 20 | Mary T. Mcdermott | 41 | Wife | Baking | Iowa |
| 21 | Raymond Papin | 20 | Son | Laborer | Iowa |
| 22 | James J. Mcdermott | 15 | Son | None | Iowa |
| 23 | Thomas J. Mcdermott | 13 | Son | None | Iowa |
| 24 | Mary F. Mcdermott | 11 | Daughter | None | Iowa |
| 25 | John L. Mcdermott | 9 | Son | None | Iowa |
| 26 | Catherine B. Mcdermott | 3 | Daughter | None | Iowa |
| 27 | Bell E. Nelson | 57 | Head | None | Iowa |
| 28 | Louis E. Nelson | 25 | Son | Delivery Man | Iowa |
| 29 | Selina M. Callahan | 55 | Head | Practical Nurse | Iowa |
| 30 | John J. Callahan THIS PERSON | 25 | Son | Polisher | Iowa |
| 31 | Loras H. Callahan | 20 | Son | Laborer | Iowa |
| 32 | Donald L. Callahan | 16 | Son | None | Iowa |
| 33 | James P. Mcaleece | 54 | Head | General Mdse | Iowa |
| 34 | Catherine Mcaleece | 53 | Wife | None | Germany |
| 35 | Donald Mcaleece | 24 | Son | Manager | Iowa |
| 36 | Vincent R. Mcaleece | 18 | Son | None | Iowa |
| 37 | John J. Lyon | 35 | Head | Machinist | Iowa |
| 38 | Lillian E. Lyon | 34 | Wife | None | Missouri |
| 39 | William E. Grabow | 48 | Head | Car Repairer | Iowa |
| 40 | Lou M. Grabow | 43 | Wife | None | Illinois |
| 41 | Ralph J. Grabow | 14 | Son | None | Iowa |
| 42 | Robert D. Grabow | 12 | Son | None | Iowa |
| 43 | Betty J. Grabow | 5 | Daughter | None | Iowa |
| 44 | Fred Grabow | 43 | Brother | Brakeman | Iowa |
| 45 | Louis H. Heusemann | 48 | Head | Laborer | Germany |
| 46 | Frieda E. Heusemann | 43 | Wife | None | Germany |
| 47 | William L. Heusemann | 23 | Son | Bed Lasting | Illinois |
| 48 | Henry L. Heusemann | 19 | Son | Truck Driver | Illinois |
| 49 | Fred J. Heusemann | 16 | Son | Laborer | Illinois |
| 50 | Tony J. Heusemann | 14 | Son | None | Iowa |
Pedigree Summary
John + 2 siblings
Gen 1 · 5 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)