MN
Mary Nicholson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Rock-Island-County, Illinois
Our Model Tree links this Mary Nicholson across the 1930 and 1940 US Censuses in Rock-Island-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 6-person household.
Age 11
b. ~1929
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Rock-Island-County, Illinois |
| Surname | Nicholson |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Rock Island |
| 1935 Residence (County) | Rock Island |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Rock Island |
| Est. Birth Year | ~1929 |
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 |
|---|---|---|---|---|
| Berda Nicholson | Head | — | 45 | ~1895 |
| Ruth Nicholson | Daughter | — | 18 | ~1922 |
| Marvin Nicholson | Son | — | 15 | ~1925 |
| Lloyd Nicholson | Son | — | 19 | ~1921 |
| Mary Nicholson | Daughter | — | 11 | ~1929 |
| Robert Nicholson | Son | — | 9 | ~1931 |
Census Appearances
1930
Rock Island, …
Daughter, age 1
Rock Island, Illinois · implied b. ~1929 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nicholson |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Rock-Island-County, Illinois
Daughter, age 11
Rock-Island-County, Illinois · implied b. ~1929 — 6 household members
| Surname | Nicholson |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Rock Island |
| 1935 Residence (County) | Rock Island |
| Income (1939) | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 11 · b. ~1929 · Illinois
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Sibling
Robert Nicholson
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Nicholson
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lloyd Nicholson
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marvin Nicholson
Sibling · 1940 · age 15
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 — Rock-Island-County, Illinois
Open full size
1940 US Federal Census — Rock-Island-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00876-00089)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Dora E. Hinsberger | 70 | Head | — | Illinois |
| 2 | Paul Hinsberger | 21 | Son | Core Setter | Illinois |
| 3 | Alberta Hinsberger | 17 | Daughter | Filing Clerk | Illinois |
| 4 | George Romont | 60 | Head | Molder | Belgium |
| 5 | Leontine Romont | 64 | Wife | — | Belgium |
| 6 | Berda Nicholson | 45 | Head | Attendant | Illinois |
| 7 | Lloyd Nicholson | 19 | Son | Footwear Laster | Illinois |
| 8 | Ruth Nicholson | 18 | Daughter | Footwear Laster | Illinois |
| 9 | Marvin Nicholson | 15 | Son | New Worker | Illinois |
| 10 | Mary Lou Nicholson THIS PERSON | 11 | Daughter | — | Illinois |
| 11 | Robert Nicholson | 9 | Son | — | Illinois |
| 12 | George, Sr. Cheek | 50 | Head | Heat Treater | Missouri |
| 13 | Lillie Cheek | 45 | Wife | — | Missouri |
| 14 | George W., Jr. Cheek | 14 | Son | — | Missouri |
| 15 | Henry Engels | 48 | Head | Rubber Grinder | Belgium |
| 16 | Emma Engels | 49 | Wife | — | Illinois |
| 17 | Dorothy Luedtke | 5 | Granddaughter | — | Illinois |
| 18 | Carol Luedtke | 3 | Granddaughter | — | Illinois |
| 19 | Richard Luedtke | 2 | Grandson | — | Illinois |
| 20 | Charles Breuwet | 61 | Head | Casting Grinder | Wisconsin |
| 21 | Mae Breuwet | 58 | Wife | — | Illinois |
| 22 | Freida Martens | 63 | Head | — | Belgium |
| 23 | Sarah Martens | 25 | Daughter | Shoemaker | Illinois |
| 24 | Achiel Snoeckx | 53 | Brother | Custodian | Belgium |
| 25 | Almer Janssens | 33 | Head | Police Patrolman | Illinois |
| 26 | Irene Janssens | 31 | Wife | — | Illinois |
| 27 | Dolores Janssens | 10 | Daughter | — | Illinois |
| 28 | Patricia Janssens | 4 | Daughter | — | Illinois |
| 29 | Ronald Janssens | 2 | Son | — | Illinois |
| 30 | Richard Doherty | 43 | Head | Assembler | Wisconsin |
| 31 | Mary Doherty | 34 | Wife | — | Illinois |
| 32 | Marie Robbeliaer | 62 | Head | — | Belgium |
| 33 | Laura Robbeliaer | 28 | Daughter | Shoemaker | Illinois |
| 34 | Zelma Robbeliaer | 25 | Daughter | Shoemaker | Illinois |
| 35 | Irma Janssens | 65 | Head | — | Belgium |
| 36 | Julia Janssens | 37 | Daughter | Card Checker | Illinois |
| 37 | Oscar Janssens | 27 | Son | Insole Cutter | Illinois |
| 38 | Jules Janssens | 25 | Son | Sole Buffer | Illinois |
| 39 | Caroline Pankow | 77 | Head | — | Germany |
| 40 | Fred Pankow | 39 | Son | — | Illinois |
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)