JD
John Dugan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this John Dugan across the 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 8-person household.
Age 22
b. ~1918
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Dugan |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | Grocery Warehouse |
| Industry | PW |
| Class of Worker | 700 |
| Highest Grade | Hs 4 |
| 1935 Residence | 54 |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Grocery Warehouse |
| Township / Ward | Indianapolis |
| Est. Birth Year | ~1918 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Bill Dugan | Son | — | 14 | ~1926 |
| Patrick Dugan | Son | — | 19 | ~1921 |
| Mary Dugan | Daughter | — | 20 | ~1920 |
| Maria Dugan | Spouse | — | 44 | ~1896 |
| Anna Dugan | Daughter | — | 12 | ~1928 |
| John Dugan | Head | — | 50 | ~1890 |
| Helen Dugan | Daughter | — | 9 | ~1931 |
| John Dugan | Son | — | 22 | ~1918 |
Census Appearances
1930
Marion, Indiana
Son, age 12
Marion, Indiana · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dugan |
| Given Name | John Joe |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Son, age 22
Marion-County, Indiana · implied b. ~1918 — 8 household members
| Surname | Dugan |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Occupation | Grocery Warehouse |
| Industry | PW |
| Class of Worker | 700 |
| Highest Grade | Hs 4 |
| 1935 Residence | 54 |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 Dugan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Dugan
Son · 1940 · age 22 · b. ~1918 · Indiana
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Sibling
Helen Dugan
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bill Dugan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Dugan
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Dugan
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Dugan
Sibling · 1940 · age 19
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
1940 US Federal Census — Marion-County, Indiana
Open full size
1940 US Federal Census — Marion-County, Indiana
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-01132-00309)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 42 | John Connor | 67 | Head | — | Indiana |
| 43 | Catherine Connor | 70 | Wife | — | Indiana |
| 44 | Mary Connor | 40 | Daughter | City Employee | Indiana |
| 45 | Joseph Connor | 38 | Son | Billiard Room | Indiana |
| 46 | Alice Connor | 36 | Daughter | Federal Dept | Indiana |
| 47 | Thomas Connor | 33 | Son | Municipal | Indiana |
| 48 | John Connor | 31 | Son | — | Indiana |
| 49 | Delia Dugan | 55 | Sister-in-law | Music Pub | Indiana |
| 50 | Gilbert Komsthoeft | 42 | Head | Farm Implement Co. | Kentucky |
| 51 | Edna R. Komsthoeft | 37 | Wife | No | Kentucky |
| 52 | Herman J. Lantz | 47 | Head | Chain Factory | Indiana |
| 53 | Clara S. Lantz | 44 | Wife | No | Indiana |
| 54 | Donald Lantz | 24 | Son | Rubber Company | Indiana |
| 55 | Lester Lantz | 20 | Son | C. E. C. | Indiana |
| 56 | Robert Lantz | 16 | Son | — | Indiana |
| 57 | Anthony Lantz | 9 | Son | — | Indiana |
| 58 | Mary Lantz | 9 | Daughter | — | Indiana |
| 59 | Eileen Lantz | 8 | Daughter | — | Indiana |
| 60 | Thomas Lantz | 5 | Son | — | Indiana |
| 61 | Emma E. Marshall | 54 | Head | — | Indiana |
| 62 | Irma Marshall | 24 | Daughter | Nut Company | Indiana |
| 63 | Lois Mann | 65 | Lodger | — | Indiana |
| 64 | Janice Mann | 6 | Lodger | — | Indiana |
| 65 | Elsie Mann | 7 | Lodger | — | Indiana |
| 66 | John Dugan | 50 | Head | Utility Company | Ireland |
| 67 | Maria A. Dugan | 44 | Wife | No | Ireland |
| 68 | John J. Dugan THIS PERSON | 22 | Son | Grocery Warehouse | Indiana |
| 69 | Mary M. Dugan | 20 | Daughter | Drug Store | Indiana |
| 70 | Patrick Dugan | 19 | Son | Grocery Store | Indiana |
| 71 | Bill Dugan | 14 | Son | — | Indiana |
| 72 | Anna Catherine Dugan | 12 | Daughter | — | Indiana |
| 73 | Helen Theresa Dugan | 9 | Daughter | — | Indiana |
| 74 | Effie Schyder | 65 | Head | Yes | Indiana |
| 76 | Frederick H. Grimm | 33 | Head | Aluminum Co. | Illinois |
| 77 | Stella M. Grimm | 35 | Wife | Telephone Co. | Indiana |
| 78 | Lawrence B. Strother | 15 | Son | — | Indiana |
| 79 | Michael J. Healey | 55 | Head | Steam Railroad | England |
| 80 | Margaret R. Healey | 49 | Wife | No | Indiana |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 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)