MN
Mary Nicholson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hamilton-County, Indiana
Our Model Tree links this Mary Nicholson across the 1930 and 1940 US Censuses in Hamilton-County, Indiana (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 8-person household.
Age 19
b. ~1921
Female
Daughter
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hamilton-County, Indiana |
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Adams Twp |
| 1935 Residence (County) | Hamilton |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Adams Twp |
| Est. Birth Year | ~1921 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Nicholson | Daughter | — | 19 | ~1921 |
| Marie Nicholson | Daughter | — | 16 | ~1924 |
| Perry Nicholson | Son | — | 14 | ~1926 |
| Harold Nicholson | Son | — | 12 | ~1928 |
| Perry Nicholson | Head | — | 52 | ~1888 |
| Charles Nicholson | Son | — | 21 | ~1919 |
| Mattie Nicholson | Spouse | — | 51 | ~1889 |
| Harlan Nicholson | Son | — | 22 | ~1918 |
Census Appearances
1930
Hamilton, Indiana
Daughter, age 9
Hamilton, Indiana · implied b. ~1921 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nickolson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Hamilton-County, Indiana
Daughter, age 19
Hamilton-County, Indiana · implied b. ~1921 — 8 household members
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Adams Twp |
| 1935 Residence (County) | Hamilton |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 19 · b. ~1921 · Indiana
★ You are viewing this record
Sibling
Harold Nicholson
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harlan Nicholson
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Nicholson
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Perry Nicholson
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Nicholson
Sibling · 1940 · age 16
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 — Hamilton-County, Indiana
Open full size
1940 US Federal Census — Hamilton-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01050-00080)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ross Pearson | 27 | Head | Truck Driver | Indiana |
| 2 | Bernice Pearson | 18 | Wife | — | Indiana |
| 3 | Philip Pearson | 1 | Son | — | Indiana |
| 4 | Perry Nicholson | 52 | Head | Farming | Indiana |
| 5 | Mattie Nicholson | 51 | Wife | — | Indiana |
| 6 | Charles Nicholson | 21 | Son | — | Indiana |
| 7 | Harlan Nicholson | 22 | Son | — | Indiana |
| 8 | Mary Nicholson THIS PERSON | 19 | Daughter | — | Indiana |
| 9 | Marie Nicholson | 16 | Daughter | — | Indiana |
| 10 | Perry Jr. Nicholson | 14 | Son | — | Indiana |
| 11 | Harold Nicholson | 12 | Son | — | Indiana |
| 12 | Edgar Reagan | 54 | Head | Farmer | Indiana |
| 13 | Belle Reagan | 55 | Wife | — | Indiana |
| 14 | Eunice Reagan | 24 | Daughter | — | Indiana |
| 15 | Leland F. Cobb | 38 | Head | Farmer | Indiana |
| 16 | Annabelle Cobb | 37 | Wife | — | Indiana |
| 17 | Louisa Greathouse | 75 | Head | — | Ohio |
| 18 | Claude Harvey | 41 | Head | Carpenter | Indiana |
| 19 | Marie Harvey | 38 | Wife | — | Indiana |
| 20 | Mary Louise Harvey | 12 | Daughter | — | Indiana |
| 21 | Donald N. Harvey | 9 | Son | — | Indiana |
| 22 | James Allen Harvey | 1 | Son | — | Indiana |
| 23 | Charles A. Webster | 56 | Head | Wood Worker | Indiana |
| 24 | Mary F. Webster | 49 | Wife | — | Indiana |
| 25 | William Webster | 21 | Son | — | Indiana |
| 26 | Betty Webster | 19 | Daughter | Operator | Indiana |
| 27 | Scott Webster | 16 | Son | Farm Laborer | Indiana |
| 28 | Rollie Kellam | 58 | Head | Farmer | Indiana |
| 29 | Bessie Kellam | 56 | Wife | — | Indiana |
| 30 | Elson Vickery | 48 | Head | Farmer | Indiana |
| 31 | Hannah Vickery | 48 | Wife | — | Indiana |
| 32 | Elizabeth Vickery | 18 | Daughter | — | Indiana |
| 33 | Mary Ellen Vickery | 14 | Daughter | — | Indiana |
| 34 | Guy Parr | 36 | Head | Farmer | Indiana |
| 35 | Nora Parr | 36 | Wife | — | Indiana |
| 36 | Josephine Parr | 12 | Daughter | — | Indiana |
| 37 | Kenneth Parr | 10 | Son | — | Indiana |
| 38 | Joe E. Kercheval | 68 | Head | Farmer | Indiana |
| 39 | Anna Kercheval | 61 | Wife | — | Indiana |
| 40 | Maude O. Kercheval | 50 | Head | Farmer | Indiana |
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)