DS
Daniel Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Daniel Sullivan across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Daniel & Lelia — first a head (b.~1901), then head of a 4-person household.
Age 39
b. ~1901
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Sullivan |
| Given Name | Daniel J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | attorney |
| Industry | own practice |
| Class of Worker | OA |
| Hours Worked | 45 |
| Income (1939) | 0 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Attorney |
| Township / Ward | Medford City |
| Est. Birth Year | ~1901 |
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 1940 census.
| Name | Relation to head | Relative to Daniel | Age | Birth yr |
|---|---|---|---|---|
| Daniel Sullivan | Head | — | 39 | ~1901 |
| Roger Sullivan | Son | — | 39 | ~1901 |
| Dennis Sullivan | Son | — | 35 | ~1905 |
| Helen Sullivan | Spouse | — | 36 | ~1904 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 18
Middlesex, Massachusetts · implied b. ~1902 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Daniel J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Truck Driver |
| Industry | Cotton Factory |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 29
Middlesex, Massachusetts · implied b. ~1901 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Daniel J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Agent |
| Industry | Real Estate |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Head, age 39
Middlesex-County, Massachusetts · implied b. ~1901 — 4 household members
| Surname | Sullivan |
| Given Name | Daniel J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Occupation | attorney |
| Industry | own practice |
| Class of Worker | OA |
| Hours Worked | 45 |
| Income (1939) | 0 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Daniel Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Daniel Sullivan (~0.92 confidence) and mother Lelia Sullivan (~0.92 confidence) and mother Julia Sullivan (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Daniel Sullivan
b. ~1868
Source father
● Household
· direct · ~0.92
Mother
Lelia Sullivan
b. ~1872
Source mother
● Household
· direct · ~0.92
Mother
Julia Sullivan
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Daniel Sullivan
Head · 1940 · age 39 · b. ~1901 · Massachusetts
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01611-00253)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary Murnane | 64 | Head | — | Eire |
| 42 | Theresa Shine | 28 | Lodger | Salesman | Massachusetts |
| 43 | Warren P. Kelley | 28 | Lodger | Platter Sorter | Massachusetts |
| 44 | George W. Constable | 46 | Lodger | Salesman | Massachusetts |
| 45 | Arthur Johnson | 36 | Head | Salesman | Massachusetts |
| 46 | Katherine M. Johnson | 47 | Wife | — | Massachusetts |
| 47 | Cornelius J. O'Neil | 59 | Head | Car Cleaner | Eire |
| 48 | Mary O'Neil | 58 | Wife | — | Eire |
| 49 | Mary M. O'Neil | 22 | Daughter | Stenographer | Massachusetts |
| 50 | Catherine P. O'Neil | 17 | Daughter | — | Massachusetts |
| 51 | John J. Sheehan | 71 | Head | — | Eire |
| 52 | Edna B. Sheehan | 29 | Daughter | Detective | Massachusetts |
| 53 | Mary O'Halloran | 44 | Head | — | Eire |
| 54 | Mary O. O'Halloran | 19 | Daughter | — | Massachusetts |
| 55 | John J. O'Halloran | 9 | Son | — | Massachusetts |
| 56 | Dennis O'Neil | 45 | Lodger | Operator | Massachusetts |
| 57 | Thomas Crawford | 33 | Lodger | Laborer | Massachusetts |
| 58 | John Griffin | 45 | Lodger | Laborer | Eire |
| 59 | George A. White | 44 | Head | Crane Man | Massachusetts |
| 60 | Mary R. White | 43 | Wife | Comptometer Operator | Massachusetts |
| 61 | Alfred M. Lanzell | 53 | Head | Shoe Store | Canada-English |
| 62 | Edith W. Lanzell | 44 | Wife | — | Massachusetts |
| 63 | Sarah J. Lanzell | 73 | Mother | — | Canada-English |
| 64 | Margaret S. Ravenscroft | 53 | Head | — | England |
| 65 | Ravenscroft | None | — | — | — |
| 66 | Warren C. Treat | 66 | Head | Restaurant | Maine |
| 67 | Julia A. Treat | 65 | Wife | — | Massachusetts |
| 68 | Daniel J. Sullivan THIS PERSON | 39 | Head | Attorney | Massachusetts |
| 69 | Helen C. Sullivan | 36 | Wife | — | Massachusetts |
| 70 | Sullivan | None | — | — | — |
| 71 | Roger K. Sullivan | 39 | Son | Attorney | Massachusetts |
| 72 | Dennis F. Sullivan | 35 | Son | Accountant | Massachusetts |
| 73 | George Choser | 66 | Head | Rail Grinder | Massachusetts |
| 74 | Alice T. Choser | 60 | Wife | — | Massachusetts |
| 75 | Catherine D. Choser | 30 | Daughter | Assembler | Massachusetts |
| 76 | David F. Leahy | 76 | Head | — | Eire |
| 77 | Elizabeth M. Leahy | 71 | Wife | — | Eire |
| 78 | John J. Leahy | 41 | Son | Clerk | Massachusetts |
| 79 | Donald J. Griffin | 30 | Head | Florist | Massachusetts |
| 80 | Anne C. Griffin | 26 | Wife | Stenographer | Massachusetts |
Pedigree Summary
Daniel
Gen 1 · 3 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)