DS
Dennis Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this Dennis Sullivan across the 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents Thomas & Thomas — first a son (b.~1905), then head of a 5-person household.
Age 35
b. ~1905
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Sullivan |
| Given Name | Dennis |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | Brakeman |
| Industry | Railroad - Freight |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1600 |
| Highest Grade | H-2 |
| 1935 Residence | Same house |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Brakeman |
| Township / Ward | Indianapolis |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Dennis | Age | Birth yr |
|---|---|---|---|---|
| Thomas Sullivan | Head | — | 61 | ~1879 |
| Mary Sullivan | Daughter | — | 24 | ~1916 |
| Hannah Sullivan | Daughter | — | 36 | ~1904 |
| Dennis Sullivan | Son | — | 35 | ~1905 |
| Bridget Sullivan | Spouse | — | 65 | ~1875 |
Census Appearances
1920
Marion, Indiana
Son, age 14
Marion, Indiana · implied b. ~1906 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Dennis |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Son, age 25
Marion, Indiana · implied b. ~1905 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Dennis |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Switchman |
| Industry | Belt Ry |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Son, age 35
Marion-County, Indiana · implied b. ~1905 — 5 household members
| Surname | Sullivan |
| Given Name | Dennis |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Occupation | Brakeman |
| Industry | Railroad - Freight |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1600 |
| Highest Grade | H-2 |
| 1935 Residence | Same house |
| 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 Dennis Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Thomas Sullivan (~0.92 confidence) and father Thomas Sullivan (~0.92 confidence) and father Tom Sullivan (~0.92 confidence) and mother Bridget Sullivan (~0.92 confidence) and mother Mary Sullivan (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Sullivan
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Thomas Sullivan
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Tom Sullivan
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Bridget Sullivan
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Mary Sullivan
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Dennis Sullivan
Son · 1940 · age 35 · b. ~1905 · Indiana
★ You are viewing this record
Sibling
Hannah Sullivan
Sibling · 1940 · age 36
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Sullivan
Sibling · 1940 · age 24
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
40 people indexed on this census page (nara:1940:m-t0627-01126-00200)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Katherine Longfree | 23 | Wife | — | Indiana |
| 42 | Robert Longfree | 2 | Son | — | Indiana |
| 43 | John Miner | 45 | Head | Salesman | Indiana |
| 44 | Geneva Miner | 45 | Wife | — | Indiana |
| 45 | Francis Lyons | 34 | Head | Proprietor | Indiana |
| 46 | Gertrude Lyons | 32 | Wife | — | Indiana |
| 47 | James Lyons | 9 | Son | — | Indiana |
| 48 | Joseph Lyons | 7 | Son | — | Indiana |
| 49 | Frank C. Mckee | 53 | Head | Salesman | Indiana |
| 50 | Franty Mckee | 53 | Wife | — | Missouri |
| 51 | Fred Koehler | 65 | Head | Upholsterer | Indiana |
| 52 | Marie Koehler | 37 | Daughter | — | Indiana |
| 53 | Paul F. Middleton | 40 | Head | Proprietor | Indiana |
| 54 | Alberta Middleton | 38 | Wife | — | Indiana |
| 55 | Earl M. Loudermilk | 51 | Head | Train Clerk | Indiana |
| 56 | Stella Loudermilk | 47 | Wife | — | Illinois |
| 57 | Dory C. Blacker | 50 | Head | Proprietor | Indiana |
| 58 | Lillie Blacker | 49 | Wife | — | Kentucky |
| 59 | Thomas Sullivan | 61 | Head | Policeman | Irish Free State |
| 60 | Bridget Sullivan | 65 | Wife | — | Irish Free State |
| 61 | Hannah Sullivan | 36 | Daughter | Bookkeeping Typist | Indiana |
| 62 | Dennis Sullivan THIS PERSON | 35 | Son | Brakeman | Indiana |
| 63 | Mary Sullivan | 24 | Daughter | Stenographer | Indiana |
| 64 | Everett Hrome | 56 | Head | Sign Painter | Indiana |
| 65 | Mamie L. Hrome | 55 | Wife | — | Indiana |
| 66 | Norman Redmond | 45 | Head | Salesman | Indiana |
| 67 | Ruth Redmond | 45 | Wife | — | Indiana |
| 68 | Jack Redmond | 21 | Son | Drug Clerk | Indiana |
| 69 | Paul Redmond | 18 | Son | — | Indiana |
| 70 | Norma Redmond | 16 | Daughter | — | Indiana |
| 71 | Phyllis Redmond | 15 | Daughter | — | Indiana |
| 72 | Thomas Redmond | 12 | Son | — | Indiana |
| 73 | Fred Felty | 44 | Head | Night Supervisor | Indiana |
| 74 | Mary Felty | 39 | Wife | — | Indiana |
| 75 | Rosemary Felty | 20 | Daughter | Machine Operator | Indiana |
| 76 | Helen F. Felty | 9 | Daughter | — | Indiana |
| 77 | Nellie Larner | 51 | Sister-in-law | Secretary | Indiana |
| 78 | Walter B. Schaloske | 45 | Head | Telegraph Clerk | Ohio |
| 79 | Phoebe A. Schaloske | 40 | Wife | — | Ohio |
| 80 | Norma J. Schaloske | 14 | Daughter | — | Ohio |
Pedigree Summary
Dennis + 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 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)