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 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1874), then head of a 3-person household.
Age 66
b. ~1874
Male
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Sullivan |
| Given Name | Michael |
| Relationship to Head | Husband |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Middlesex |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Est. Birth Year | ~1874 |
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 1940 census.
| Name | Relation to head | Relative to Michael | Age | Birth yr |
|---|---|---|---|---|
| Vera Sullivan | Daughter | — | 34 | ~1906 |
| Sarah Sullivan | Head | — | 75 | ~1865 |
| Michael Sullivan | Spouse | — | 66 | ~1874 |
Census Appearances
1920
Middlesex, Massachusetts
Other, age 45
Middlesex, Massachusetts · implied b. ~1875 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Michael L. |
| Relationship to Head | Lodger |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Dresser |
| Industry | Silk Mill |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Other, age 56
Middlesex, Massachusetts · implied b. ~1874 — 14 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Michael |
| Relationship to Head | Lodger |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laborer |
| Industry | Electric Light |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 66
Middlesex-County, Massachusetts · implied b. ~1874 — 3 household members
| Surname | Sullivan |
| Given Name | Michael |
| Relationship to Head | Husband |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Middlesex |
| 1935 Residence (County) | Middlesex |
| Highest Grade | No 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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Michael Sullivan
Spouse · 1940 · age 66 · b. ~1874 · Massachusetts
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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
24 people indexed on this census page (nara:1940:m-t0627-01694-00033)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Sarah J. Sullivan | 75 | Head | — | Massachusetts |
| 42 | Michael Sullivan THIS PERSON | 66 | Husband | — | Massachusetts |
| 43 | Vera Sullivan | 34 | Daughter | — | Massachusetts |
| 44 | Agnes Lahiff | 62 | Head | Clerk | Massachusetts |
| 45 | Herman Lahiff | 34 | Daughter | Clerk | Massachusetts |
| 46 | Catherine Lahiff | 29 | Daughter | Hostess | Massachusetts |
| 47 | James Lahiff | 21 | Son | Clerk | Massachusetts |
| 48 | Arthur Hall | 42 | Head | Laborer | Massachusetts |
| 49 | Josephine Hall | 41 | Wife | — | Massachusetts |
| 50 | Arthur Hall | 22 | Son | New Worker | Massachusetts |
| 51 | William Hall | 20 | Son | New Worker | Massachusetts |
| 52 | Raymond Hall | 19 | Son | New Worker | Massachusetts |
| 53 | Leo Rental | 33 | Head | Janitor | Massachusetts |
| 54 | Jeannette Rental | 32 | Wife | — | Massachusetts |
| 55 | Geraldine Rental | 10 | Daughter | — | Massachusetts |
| 56 | Constance Rental | 8 | Daughter | — | Massachusetts |
| 57 | Paul Rental | 4 | Son | — | Massachusetts |
| 58 | Robert Rental | 3 | Son | — | Massachusetts |
| 59 | Roger Rental | 1 | Son | — | Massachusetts |
| 60 | Michael Quinn | 69 | Head | Electrician | Eire |
| 61 | Nellie Quinn | 65 | Wife | — | Eire |
| 62 | Mary Quinn | 33 | Daughter | Stenographer | Massachusetts |
| 63 | Thomas Quinn | 30 | Son | Electrician | Massachusetts |
| 64 | Daniel Quinn | 26 | Son | Clerk | Massachusetts |
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)