MS
Michael Sullivan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Michael Sullivan across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 11-person household.
Age 15
b. ~1925
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Sullivan |
| Given Name | Michael |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Malden City |
| Est. Birth Year | ~1925 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Michael | Age | Birth yr |
|---|---|---|---|---|
| Anna Sullivan | Daughter | — | 17 | ~1923 |
| Maureen Sullivan | Daughter | — | 3 | ~1937 |
| Arlene Sullivan | Daughter | — | 1 | ~1939 |
| Agnes Sullivan | Daughter | — | 18 | ~1922 |
| Frances Sullivan | Daughter | — | 13 | ~1927 |
| Joseph Sullivan | Head | — | 44 | ~1896 |
| Robert Sullivan | Son | — | 6 | ~1934 |
| Michael Sullivan | Son | — | 15 | ~1925 |
| Thomas Sullivan | Son | — | 7 | ~1933 |
| Lawrence Sullivan | Son | — | 12 | ~1928 |
| Agnes Sullivan | Spouse | — | 38 | ~1902 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 4
Middlesex, Massachusetts · implied b. ~1926 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Michael |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 15
Middlesex-County, Massachusetts · implied b. ~1925 — 11 household members
| Surname | Sullivan |
| Given Name | Michael |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | 8 |
| 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 Michael Sullivan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Michael Sullivan
Son · 1940 · age 15 · b. ~1925 · Massachusetts
★ You are viewing this record
Sibling
Robert Sullivan
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arlene Sullivan
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Agnes Sullivan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Sullivan
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maureen Sullivan
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Sullivan
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Sullivan
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Sullivan
Sibling · 1940 · age 13
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 — 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-t0627-01608-00662)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Maurice B. O'Leary | 41 | Head | Compositor | Massachusetts |
| 2 | Mary W. O'Leary | 39 | Wife | — | Massachusetts |
| 3 | Barbara A. O'Leary | 18 | Daughter | New Worker | Massachusetts |
| 4 | Dorothy E. O'Leary | 17 | Daughter | — | Massachusetts |
| 5 | Eugene B. O'Leary | 15 | Son | — | Massachusetts |
| 6 | Joan T. O'Leary | 14 | Daughter | — | Massachusetts |
| 7 | Patricia M. O'Leary | 12 | Daughter | — | Massachusetts |
| 8 | Burke G. O'Leary | 10 | Daughter | — | Massachusetts |
| 9 | Florence Sullivan | 72 | Head | Retired | Ireland |
| 10 | Margaret Sullivan | 29 | Daughter | — | Massachusetts |
| 11 | Catherine Sullivan | 27 | Daughter | — | Massachusetts |
| 12 | Edith B. Slater | 66 | Head | — | Massachusetts |
| 13 | Grace M. Slater | 57 | Sister | Treasurer-Secy | Massachusetts |
| 14 | Clarence H. Anderson | 73 | Head | Laborer | England |
| 15 | Eliza Anderson | 68 | Wife | — | England |
| 16 | Joseph P. Sullivan | 44 | Head | Fireman | Massachusetts |
| 17 | Agnes E. Sullivan | 38 | Wife | — | Massachusetts |
| 18 | Agnes C. Sullivan | 18 | Daughter | — | Massachusetts |
| 19 | Anna M. Sullivan | 17 | Daughter | — | Massachusetts |
| 20 | Michael Sullivan THIS PERSON | 15 | Son | — | Massachusetts |
| 21 | Frances Sullivan | 13 | Daughter | — | Massachusetts |
| 22 | Lawrence Sullivan | 12 | Son | — | Massachusetts |
| 23 | Thomas Sullivan | 7 | Son | — | Massachusetts |
| 24 | Robert Sullivan | 6 | Son | — | Massachusetts |
| 25 | Maureen Sullivan | 3 | Daughter | — | Massachusetts |
| 26 | Arlene Sullivan | 1 | Daughter | — | Massachusetts |
| 27 | Alexander W. Derocher|Derocher | 76 | Head | — | New York |
| 28 | Mae G. Derocher|Derocher | 68 | Wife | — | Maine |
| 29 | William B. Anderson | 52 | Son | Laborer | Massachusetts |
| 30 | Almira Anderson | 38 | Daughter-in-law | — | New York |
| 31 | Eleanor Anderson | 19 | Daughter | — | Massachusetts |
| 32 | John J. Hunt | 71 | Lodger | Custodian | Massachusetts |
| 33 | Gordon D. Atkinson | 46 | Head | Medical Doctor | England |
| 34 | Alma L. Atkinson | 48 | Wife | — | Canada |
| 35 | Gordon D. Atkinson | 14 | Son | — | Massachusetts |
| 36 | Margaret E. Atkinson | 11 | Daughter | — | Massachusetts |
| 37 | Nancy L. Atkinson | 8 | Daughter | — | Massachusetts |
| 38 | Esther E. Heffern | 25 | Maid | Maid | Massachusetts |
| 39 | Alice P. George | 75 | Head | Selling Dresses | Massachusetts |
| 40 | Luella H. Rolfe | 78 | Lodger | — | Massachusetts |
Related Census Records
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)