JD
James Duffy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Dubuque, Iowa
Our Model Tree links this James Duffy across the 1910, 1920 and 1930 US Censuses in Dubuque, Iowa (XGBoost, ~Confirmed) — first a head (b.~1879), then head of a 3-person household.
Age 51
b. ~1879
Male
Head
Born: Nebraska
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Dubuque, Iowa |
| Surname | Duffy |
| Given Name | James J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Nebraska |
| Age at First Marriage | 27 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Station agent |
| Industry | Rail road |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 6000 |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
| Occupation | Station Agent |
| Township / Ward | Dyersville City |
| Est. Birth Year | ~1879 |
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.
3 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Mary Duffy | Daughter | — | 15 | ~1915 |
| James Duffy | Head | — | 51 | ~1879 |
| Martha Duffy | Other | — | 44 | ~1886 |
Census Appearances
1910
Dubuque, Iowa
Head, age 30
Dubuque, Iowa · implied b. ~1880 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | James F. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Nebraska |
| Years Married | 3 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Agent |
| Industry | Depot RR |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
1920
Dubuque, Iowa
Head, age 41
Dubuque, Iowa · implied b. ~1879 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | James J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Nebraska |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Agent |
| Industry | I. C. Depot |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
1930
Dubuque, Iowa
Head, age 51
Dubuque, Iowa · implied b. ~1879 — 3 household members
| Surname | Duffy |
| Given Name | James J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Nebraska |
| Age at First Marriage | 27 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Station agent |
| Industry | Rail road |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 6000 |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
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 James Duffy across 3 US Census years (1910, 1920 and 1930) in Dubuque, Iowa, using XGBoost record linkage.
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This person
Anchor record
James Duffy
Head · 1930 · age 51 · b. ~1879 · Iowa
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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:iowacensus00reel654:0541)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Floyd Fauke | 11 | Son | — | Iowa |
| 2 | Anna M Utt | 50 | Head | Lawyer | Iowa |
| 3 | Alphonse Thillen | 32 | Head | Proprietor | Iowa |
| 4 | Bertha Thillen | 27 | Wife-H | — | Iowa |
| 5 | Leland Thillen | 4 | Daughter | — | Iowa |
| 6 | Gertrude Anstotter | 59 | Servant | — | Iowa |
| 7 | Halley Barry | 32 | Head | Dentist | Iowa |
| 8 | Madelyn Barry | 28 | Wife-H | — | Iowa |
| 9 | William Barry | 1 | Son | — | Iowa |
| 10 | Herman Hueneke | 43 | Head | Salesman | Iowa |
| 11 | Philomena Hueneke | 34 | Wife-H | — | Iowa |
| 12 | Viola Hueneke | 21 | Daughter | Seamstress | Iowa |
| 13 | Charles Hueneke | 11 | Son | — | Iowa |
| 14 | Helen Hueneke | 9 | Daughter | — | Iowa |
| 15 | Lionel Hueneke | 7 | Son | — | Iowa |
| 16 | Robert Hueneke | 4 | Son | — | Iowa |
| 17 | Richard Hueneke | 1 | Son | — | Iowa |
| 18 | Gerhard Freking | 45 | Head | Section Foreman | Iowa |
| 19 | Barbara Freking | 44 | Wife-H | — | Iowa |
| 20 | Marguerite Freking | 18 | Daughter | — | Iowa |
| 21 | Catherine Freking | 16 | Daughter | — | Iowa |
| 22 | Aloys Freking | 12 | Son | — | Iowa |
| 23 | Dorothy Freking | 9 | Daughter | — | Iowa |
| 24 | Constance Freking | 6 | Daughter | — | Iowa |
| 25 | Arthur Schneiders | 28 | Head | Laborer | Iowa |
| 26 | Marcella Schneiders | 23 | Wife-H | — | Iowa |
| 27 | Gerald Schneiders | 2 | Son | — | Iowa |
| 28 | Geraldine Schneiders | 2 | Daughter | — | Iowa |
| 29 | Robert Schneiders | 0 | Son | — | Iowa |
| 30 | Henry Tobber | 72 | Head | — | Germany |
| 31 | Emil Klosterman | 32 | Son-in-law | Proprietor | Iowa |
| 32 | Marcella Klosterman | 28 | Daughter | Table Waiter | Iowa |
| 33 | Louis Hildebrand | 29 | Head | Laborer | Iowa |
| 34 | Frances Hildebrand | 21 | Wife-H | — | Iowa |
| 35 | Robert Hildebrand | 1 | Son | — | Iowa |
| 36 | William Rittinger | 31 | Head | Laborer | Iowa |
| 37 | Hilda Rittinger | 30 | Wife-H | — | Iowa |
| 38 | Dorothy Rittinger | 4 | Daughter | — | Iowa |
| 39 | Lorraine Rittinger | 4 | Daughter | — | Iowa |
| 40 | Paul W. Rittinger | 1 | Son | — | Iowa |
| 41 | Paul Kremer | 35 | Head | Foreman | Iowa |
| 42 | Mary Kremer | 34 | Wife-H | — | Iowa |
| 43 | Wilfred Schmitz | 29 | Head | Musician | Iowa |
| 44 | Loretta Schmitz | 31 | Wife-H | — | Iowa |
| 45 | Mary E. Schmitz | 6 | Daughter | — | Iowa |
| 46 | John Schmitz | 4 | Son | — | Iowa |
| 47 | James Schmitz | 1 | Son | — | Iowa |
| 48 | James J. Duffy THIS PERSON | 51 | Head | Station Agent | Nebraska |
| 49 | Martha M. Duffy | 44 | Wife-H | — | Iowa |
| 50 | Mary P. Duffy | 15 | Daughter | — | Iowa |
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)