MN
Mary Nicholson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Nicholson across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 7-person household.
Age 15
b. ~1925
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Nicholson |
| Given Name | Mary R. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Anna Nicholson | Spouse | — | 48 | ~1892 |
| Joseph Nicholson | Son | — | 22 | ~1918 |
| George Nicholson | Son | — | 20 | ~1920 |
| Virginia Nicholson | Daughter | — | 12 | ~1928 |
| John Nicholson | Son | — | 18 | ~1922 |
| Mary Nicholson | Daughter | — | 15 | ~1925 |
| George Nicholson | Head | — | 56 | ~1884 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 5
Suffolk, Massachusetts · implied b. ~1925 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 15
Suffolk-County, Massachusetts · implied b. ~1925 — 7 household members
| Surname | Nicholson |
| Given Name | Mary R. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Highest Grade | H 1 |
| 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 Nicholson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Nicholson
Daughter · 1940 · age 15 · b. ~1925 · Massachusetts
★ You are viewing this record
Sibling
Joseph Nicholson
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Nicholson
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia Nicholson
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Nicholson
Sibling · 1940 · age 18
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01668-00512)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Phillip P. Clifford | 23 | Brother | Filling | Massachusetts |
| 2 | George A. Nicholson | 56 | Head | Foreman Clerk | Nova Scotia |
| 3 | Anna M. Nicholson | 48 | Wife | — | Massachusetts |
| 4 | Joseph H. Nicholson | 22 | Son | Laborer | Massachusetts |
| 5 | George H. Nicholson | 20 | Son | Counterman | Massachusetts |
| 6 | John J. Nicholson | 18 | Son | Counterman | Massachusetts |
| 7 | Mary R. Nicholson THIS PERSON | 15 | Daughter | — | Massachusetts |
| 8 | Virginia M. Nicholson | 12 | Daughter | — | Massachusetts |
| 9 | James F. Flynn | 25 | Head | Fireman'S Helper | Massachusetts |
| 10 | Helen T. Flynn | 27 | Wife | — | Massachusetts |
| 11 | James F. Jr. Flynn | 4 | Son | — | Massachusetts |
| 12 | Carole A. Flynn | 2 | Daughter | — | Massachusetts |
| 13 | James M. Harold | 28 | Head | Milk Salesman | Massachusetts |
| 14 | Mary A. Harold | 28 | Wife | — | Massachusetts |
| 15 | Robert Harold | 2 | Son | — | Massachusetts |
| 16 | Robert Daurit | 36 | Head | Expressman | Massachusetts |
| 17 | Nora Daurit | 35 | Wife | — | Massachusetts |
| 18 | Lorraine Daurit | 9 | Daughter | — | Massachusetts |
| 19 | Roberta Daurit | 3 | Daughter | — | Massachusetts |
| 20 | John J. Swanson | 27 | Head | Laundry Worker | Massachusetts |
| 21 | Mary G. Swanson | 26 | Wife | Account Clerk | Massachusetts |
| 22 | Frederick D. Donovan | 57 | Head | Laborer | Massachusetts |
| 23 | Gertrude A. Donovan | 54 | Wife | — | Massachusetts |
| 24 | Dorothy D. Donovan | 22 | Daughter | Clerical | Massachusetts |
| 25 | Mary U. Baker | 63 | Head | — | Massachusetts |
| 26 | Mabel V. O'Malley | 60 | Head | Seamstress | Massachusetts |
| 27 | Edward Harnett | 63 | Lodger | Shoe Cutter | Massachusetts |
| 28 | Harry J. Jr. Jenkins | 41 | Head | Stockman | Massachusetts |
| 29 | Ruth V. Jenkins | 41 | Wife | — | Massachusetts |
| 30 | Ruth Jenkins | 11 | Daughter | — | Massachusetts |
| 31 | Barbara J. Jenkins | 4 | Daughter | — | Massachusetts |
| 32 | Harry J. Jenkins | 70 | Head | — | New York |
| 33 | Mabel M. Jenkins | 66 | Wife | — | Massachusetts |
| 34 | Patrick J. Borsett | 29 | Head | Mechanic | Massachusetts |
| 35 | Margaret Borsett | 27 | Wife | — | Massachusetts |
| 36 | Richard Borsett | 1 | Son | — | Massachusetts |
| 37 | Mary Sullivan | 66 | Mother | — | Ireland |
| 38 | Delia A. Giardina | 69 | Head | — | Massachusetts |
| 39 | Mary W. Giardina | 31 | Daughter | Teacher | Massachusetts |
| 40 | Charles Evans | 39 | Head | Police Officer | 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)