MN
Mary Nicholson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Nicholson across the 1900, 1910, 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1865), then head of a 6-person household.
Age 75
b. ~1865
Female
Spouse
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 75 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Alien |
| Additional Details | |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Township / Ward | Malden City |
| Est. Birth Year | ~1865 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Harrington | Daughter | — | 41 | ~1899 |
| Mary Nicholson | Spouse | — | 75 | ~1865 |
| Michael Nicholson | Head | — | 78 | ~1862 |
| Robert Harrington | Other | — | 12 | ~1928 |
| Alfred Harrington | Other | — | 40 | ~1900 |
| Charles Nicholson | Son | — | 42 | ~1898 |
Census Appearances
1900
Middlesex, Massachusetts
Spouse, age 37
Middlesex, Massachusetts · implied b. ~1863 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nicholson |
| Given Name | Mary B |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Scotland |
| Birth Month | Sept |
| Birth Year | 1863 |
| Year of Immigration | 1888 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Write | Yes |
| Speaks English | Yes |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1910
Middlesex, Massachusetts
Spouse, age 45
Middlesex, Massachusetts · implied b. ~1865 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Scotland |
| Years Married | 24 |
| Children Born | 7 |
| Children Living | 7 |
| Year of Immigration | 1887 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1920
Middlesex, Massachusetts
Spouse, age 55
Middlesex, Massachusetts · implied b. ~1865 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Scotland |
| Year of Immigration | 1888 |
| Naturalization Status | Alien |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1930
Middlesex, Massachusetts
Spouse, age 64
Middlesex, Massachusetts · implied b. ~1866 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nicholson |
| Given Name | Mary A |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 64 |
| Marital Status | Married |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1889 |
| Age at First Marriage | 21 |
| Father's Birthplace | Ireland Free State |
| Mother's Birthplace | Ireland Free State |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Middlesex-County, Massachusetts
Spouse, age 75
Middlesex-County, Massachusetts · implied b. ~1865 — 6 household members
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 75 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Alien |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Nicholson across 5 US Census years (1900, 1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Nicholson
Spouse · 1940 · age 75 · b. ~1865 · 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
40 people indexed on this census page (nara:1940:m-t0627-01609-00234)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Elizabeth Cahill | 41 | Sister | Comptometer Operator | Massachusetts |
| 42 | Leo Cahill | 39 | Brother | Auditor | Massachusetts |
| 43 | Gladys Dodge | 43 | Brother-in-law | Auto Mechanic | Massachusetts |
| 44 | Delia Dodge | 43 | Sister | — | Massachusetts |
| 45 | Lawrence Dodge | 17 | Nephew | — | Massachusetts |
| 46 | Paul Dodge | 7 | Nephew | — | Massachusetts |
| 47 | Annie Kennure | 59 | Head | — | Eire |
| 48 | Harry Hoffman | 49 | Lodger | Postal Clerk | Massachusetts |
| 49 | B. O'Keefe | 49 | Lodger | — | Massachusetts |
| 50 | John Neville | 62 | Lodger | — | Massachusetts |
| 51 | William Simpkins | 51 | Head | Riveter | Massachusetts |
| 52 | Louie Simpkins | 45 | Wife | — | Austria |
| 53 | Ruth Simpkins | 19 | Daughter | File Clerk | Massachusetts |
| 54 | Barbara Simpkins | 17 | Daughter | Messenger | Massachusetts |
| 55 | Louie Simpkins | 15 | Daughter | — | Massachusetts |
| 56 | Betty Simpkins | 13 | Daughter | — | Massachusetts |
| 57 | Charles Simpkins | 10 | Son | — | Massachusetts |
| 58 | Thomas Quinn | 61 | Head | Wool Packing | Massachusetts |
| 59 | Grace Quinn | 59 | Wife | — | Massachusetts |
| 60 | Edith Quinn | 42 | Daughter | — | Massachusetts |
| 61 | John Quinn | 36 | Son | Wool Packer | Massachusetts |
| 62 | Virginia Quinn | 22 | Daughter | Seamstress | Massachusetts |
| 63 | Eleanor Quinn | 18 | Daughter | Dress Worker | Massachusetts |
| 64 | Grace Quinn | 16 | Daughter | — | Massachusetts |
| 65 | Thomas Quinn | 38 | Son | Chauffeur | Massachusetts |
| 66 | Michael Nicholson | 78 | Head | — | Scotland |
| 67 | Mary Nicholson THIS PERSON | 75 | Wife | — | Scotland |
| 68 | Charles Nicholson | 42 | Son | Salesman | Massachusetts |
| 69 | Alfred Harrington | 40 | Son in law | Heeler | Massachusetts |
| 70 | Mary Harrington | 41 | Daughter | Operator Fastener Co. | Massachusetts |
| 71 | Robert Harrington | 12 | Grandson | — | Massachusetts |
| 72 | Zilla Lowe | 46 | Head | Cashier & Bookkeeper | Massachusetts |
| 73 | Howard Lowe | 21 | Son | Teller | Massachusetts |
| 74 | Edna Lowe | 20 | Daughter | Radio Constructor | Massachusetts |
| 75 | Frank Mace | 68 | Father | — | Massachusetts |
| 76 | Sarah Lewis | 69 | Head | — | Canada-English |
| 77 | Elmina Lewis | 36 | Daughter | — | Massachusetts |
| 78 | William Matthews | 32 | Son-in-law | Assembler | Massachusetts |
| 79 | Marion Matthews | 32 | Daughter | — | Massachusetts |
| 80 | Walter Hodge | 28 | Son-in-law | Foreman | 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)