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Mary Merrill — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Merrill across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Percy & Percy — first a daughter (b.~1905), then head of a 7-person household.
Age 35
b. ~1905
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Merrill |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Natick |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 349 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Teacher |
| Township / Ward | Natick |
| 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Agnes Merrill | Spouse | — | 64 | ~1876 |
| Mary Merrill | Daughter | — | 35 | ~1905 |
| Thomas Morrissey | Other | — | 23 | ~1917 |
| Dorothy Parker | Daughter | — | 37 | ~1903 |
| Percy Merrill | Head | — | 62 | ~1878 |
| James Parker | Other | — | 16 | ~1924 |
| Percy Merrill | Son | — | 31 | ~1909 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 15
Middlesex, Massachusetts · implied b. ~1905 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Morrill |
| Given Name | Mary M |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 25
Middlesex, Massachusetts · implied b. ~1905 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Morrill |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 35
Middlesex-County, Massachusetts · implied b. ~1905 — 7 household members
| Surname | Merrill |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Natick |
| 1935 Residence (County) | Middlesex |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 349 |
| 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 Mary Merrill across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Percy Morrill (~0.92 confidence) and father Percy Morrill (~0.50 confidence) and father Percy Merrill (~0.92 confidence) and mother Agnes Merrill (~0.92 confidence) and mother Agnes Morrill (~0.50 confidence) and mother Agnes Morrill (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.78
Father
Percy Morrill
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Percy Morrill
b. ~1907
Source father
● Household
· direct · ~0.5
Father
Percy Merrill
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Agnes Merrill
b. ~1876
Source mother
● Household
· direct · ~0.92
Mother
Agnes Morrill
b. ~1907
Source mother
● Household
· direct · ~0.5
Mother
Agnes Morrill
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Merrill
Daughter · 1940 · age 35 · b. ~1905 · Massachusetts
★ You are viewing this record
Sibling
Percy Merrill
Sibling · 1940 · age 31
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Parker
Sibling · 1940 · age 37
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-t0627-01613-00953)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frank G. Napper | 48 | Daughter | Laborer | Massachusetts |
| 42 | Gertrude O. Richardson | 46 | Head | Hostess | Canada English |
| 43 | Margaret M. Richardson | 12 | Daughter | — | Massachusetts |
| 44 | Raymond F. Myers | 31 | Head | Clerk | Massachusetts |
| 45 | Mary E. Myers | 27 | Wife | — | Massachusetts |
| 46 | Raymond F. Jr. Myers | 1 | Son | — | Massachusetts |
| 47 | Frank W. Myers | 64 | Father | Cook | Massachusetts |
| 48 | Otto M. Anderson | 65 | Head | — | Vermont |
| 49 | Lilla M. Anderson | 31 | Daughter | Technician | Vermont |
| 50 | Mark Featherman | 64 | Head | Presser | England |
| 51 | Millie Featherman | 63 | Wife | — | Russia |
| 52 | Jennie Featherman | 34 | Daughter | Secretary | Massachusetts |
| 53 | James Merrill | 56 | Head | — | Canada English |
| 54 | Jerry Merrill | 34 | Son | Laborer | Massachusetts |
| 55 | George Merrill | 31 | Son | Machinist | Massachusetts |
| 56 | Percy Merrill | 62 | Head | Engineer | Massachusetts |
| 57 | Agnes E. Merrill | 64 | Wife | — | Massachusetts |
| 58 | Mary M. Merrill THIS PERSON | 35 | Daughter | Teacher | Massachusetts |
| 59 | Percy Jr. Merrill | 31 | Son | Teller | Massachusetts |
| 60 | Dorothy Parker | 37 | Daughter | — | Massachusetts |
| 61 | James Parker | 16 | Grandson | — | Massachusetts |
| 62 | Thomas Morrissey | 23 | Nephew | Laborer | Massachusetts |
| 63 | Eugene J. Moriarty | 65 | Head | Engineer | Massachusetts |
| 64 | Julia E. Moriarty | 55 | Wife | Cook | Irish Free State |
| 65 | John H. Murphy | 28 | Son-in-law | Carpenter | Massachusetts |
| 66 | Ruth N. Murphy | 24 | Daughter | — | Massachusetts |
| 67 | John H. Jr. Murphy | 5 | Grandson | — | Massachusetts |
| 68 | Patricia A. Murphy | 4 | Granddaughter | — | Massachusetts |
| 69 | Paul J. Mcguire | 39 | Head | Clerk | Massachusetts |
| 70 | Florence J. Mcguire | 44 | Wife | — | Massachusetts |
| 71 | Paul Jr. Mcguire | 14 | Son | — | Massachusetts |
| 72 | Robert Mcguire | 12 | Son | — | Massachusetts |
| 73 | Florence Mcguire | 10 | Daughter | — | Massachusetts |
| 74 | Frank W. Mandeville | 79 | Lodger | — | Massachusetts |
| 75 | Vincent Adams | 50 | Head | Barber | Albania |
| 76 | Olga Adams | 31 | Wife | Hair Dresser | Albania |
| 77 | Michael C. Adams | 15 | Son | — | Massachusetts |
| 78 | Stephen E. Adams | 13 | Son | — | Massachusetts |
| 79 | George R. Adams | 11 | Son | — | Massachusetts |
| 80 | Constance E. Adams | 1 | Daughter | — | Massachusetts |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 6 parents
~0.78
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)