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 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1905), then head of a 6-person household.
Age 35
b. ~1905
Female
Spouse
Born: Canada-English
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Nicholson |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Canada-English |
| 1935 Residence (City) | Cambridge |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Alien |
| Additional Details | |
| Occupation | Dressmaker |
| Industry | At Home |
| Class of Worker | OA |
| Highest Grade | Hs 2 |
| 1935 Residence | Mass |
| Birthplace (normalized) | canada-english |
| Occupation | Dressmaker |
| Township / Ward | Medford |
| 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Donald Nicholson | Head | — | 41 | ~1899 |
| Donald Nicholson | Son | — | 11 | ~1929 |
| Jean Nicholson | Daughter | — | 7 | ~1933 |
| Adele Nicholson | Daughter | — | 5 | ~1935 |
| James Nicholson | Son | — | 3 | ~1937 |
| Mary Nicholson | Spouse | — | 35 | ~1905 |
Census Appearances
1930
Middlesex, Massachusetts
Spouse, age 25
Middlesex, Massachusetts · implied b. ~1905 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nicholson |
| Given Name | Mary Adele |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Canada-English |
| Naturalization Status | Alien |
| Year of Immigration | 1922 |
| Age at First Marriage | 23 |
| Father's Birthplace | Canada-English |
| Mother's Birthplace | Canada-English |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birthplace (normalized) | canada-english |
1940
Middlesex-County, Massachusetts
Spouse, age 35
Middlesex-County, Massachusetts · implied b. ~1905 — 6 household members
| Surname | Nicholson |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Canada-English |
| 1935 Residence (City) | Cambridge |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Alien |
| Occupation | Dressmaker |
| Industry | At Home |
| Class of Worker | OA |
| Highest Grade | Hs 2 |
| 1935 Residence | Mass |
| Birthplace (normalized) | canada-english |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Nicholson
Spouse · 1940 · age 35 · b. ~1905 · 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
39 people indexed on this census page (nara:1940:m-t0627-01612-00343)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edna M. Conto | 18 | Daughter | — | Mass |
| 2 | Victor S. Fobriano | 43 | Head | Manager | Italy |
| 3 | Helen M. Fobriano | 41 | Wife | — | Mass |
| 4 | Victor S. Jr. Fobriano | 11 | Son | — | Mass |
| 5 | Christy Angelo | 42 | Head | Chef | Greece |
| 6 | Rowena G. Angelo | 27 | Wife | Housemaid | Maine |
| 7 | Frank G. Cotter | 42 | Head | Truck Driver | Mass |
| 8 | Lillian A. Cotter | 38 | Wife | Waitress | Mass |
| 9 | Margaret L. Cotter | 19 | Daughter | Waitress | Mass |
| 10 | John F. Cotter | 18 | Son | — | Mass |
| 11 | Dorothy E. Cotter | 16 | Daughter | — | Mass |
| 12 | Lesley F. Cotter | 14 | Daughter | — | Mass |
| 13 | Luigi Pinfilo Spera | 49 | Head | Waiter | Italy |
| 14 | Lucy Spera | 42 | Wife | — | Italy |
| 15 | Agnes Conti | 16 | Neice | — | Mass |
| 16 | Cilerone Luigi | 55 | Partner | Laborer | Italy |
| 17 | Michelina Luigi | 52 | Partner's Wife | — | Italy |
| 18 | Albert Luigi | 18 | Partner's Son | New Worker | Italy |
| 19 | Nels Hansen | 43 | Head | Truck Driver | Denmark |
| 20 | Bertha Hansen | 37 | Wife | — | Mass |
| 21 | Kenneth Hansen | 8 | Son | — | Mass |
| 22 | Santa Santa Paula | 68 | Head | — | Italy |
| 23 | Rose Santa Paula | 43 | Daughter | Chocolate Dipper | Italy |
| 24 | Carmela Santa Paula | 35 | Daughter | Machine Operator | Mass |
| 25 | Dominic Santa Paula | 46 | Son | — | Italy |
| 26 | Giacomino Santa Paula | 34 | Daughter-in-law | — | Italy |
| 27 | Rosaria Santa Paula | 12 | Grand-daughter | — | Mass |
| 28 | Joseph Santa Paula | 9 | Grand-son | — | Mass |
| 29 | Anthony Santa Paula | 8 | Grand-son | — | Mass |
| 30 | Alfred Pellegrini | 35 | Head | Waiter | Pennsylvania |
| 31 | Constance Pellegrini | 32 | Wife | — | Mass |
| 32 | Louise Pellegrini | 8 | Daughter | — | Mass |
| 33 | Lawrence Pellegrini | 7 | Son | — | Mass |
| 34 | Donald A. Nicholson | 41 | Head | Store Keeper | Canada-English |
| 35 | Mary A. Nicholson THIS PERSON | 35 | Wife | Dressmaker | Canada-English |
| 36 | Donald W. Nicholson | 11 | Son | — | Mass |
| 37 | Jean C. Nicholson | 7 | Daughter | — | Mass |
| 38 | Adele E. Nicholson | 5 | Daughter | — | Mass |
| 39 | James W. Nicholson | 3 | Son | — | Mass |
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)