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Mary Nicholson — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Nicholson across the 1920 and 1930 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1912), then head of a 10-person household.
Age 18
b. ~1912
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Free State |
| Additional Details | |
| Occupation | Typist |
| Industry | Insurance |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Typist |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1912 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Nicholson | Daughter | — | 18 | ~1912 |
| John Nicholson | Son | — | 20 | ~1910 |
| William Nicholson | Son | — | 6 | ~1924 |
| Margaret Nicholson | Daughter | — | 14 | ~1916 |
| John Nicholson | Head | — | 51 | ~1879 |
| Catherine Nicholson | Daughter | — | 23 | ~1907 |
| Florence Nicholson | Daughter | — | 12 | ~1918 |
| James Nicholson | Son | — | 21 | ~1909 |
| Lucille Nicholson | Daughter | — | 10 | ~1920 |
| Margaret Nicholson | Spouse | — | 51 | ~1879 |
Census Appearances
1920
Cook, Illinois
Daughter, age 7
Cook, Illinois · implied b. ~1913 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Ireland |
| Mother Tongue | English |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 18
Cook, Illinois · implied b. ~1912 — 10 household members
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Free State |
| Occupation | Typist |
| Industry | Insurance |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 (1920 and 1930) in Cook, Illinois, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Nicholson
Daughter · 1930 · age 18 · b. ~1912 · Illinois
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Sibling
James Nicholson
Sibling · 1930 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Nicholson
Sibling · 1930 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Nicholson
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Nicholson
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Nicholson
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucille Nicholson
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Nicholson
Sibling · 1930 · age 20
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
1930 US Federal Census — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel437:0700)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Phillip B Mattis | 60 | Head | Superintendent | New York |
| 2 | Agnes Mattis | 52 | Wife | — | New York |
| 3 | Patrick Shannon | 70 | Head | — | New York |
| 4 | Delia Shannon | 62 | Wife | — | Ireland |
| 5 | Patrick Griffin | 25 | Boarder | Freight Handler | Ireland |
| 6 | John Cody | 24 | Boarder | Freight Handler | Ireland |
| 7 | Charles Bennett | 57 | Head | Fireman | Illinois |
| 8 | Anna Bennett | 54 | Wife | — | Illinois |
| 9 | Walter Bennett | 29 | Son | Lineman | Illinois |
| 10 | Belle Bennett | 27 | Daughter | — | Illinois |
| 11 | William Bennett | 17 | Son | Chain Maker | Illinois |
| 12 | Jean Bennett | 15 | Daughter | — | Illinois |
| 13 | Betty J Fallon | 7 | Granddaughter | — | Illinois |
| 14 | Jacqueline Fallon | 7 | Granddaughter | — | Illinois |
| 15 | Dorothy Fallon | 6 | Granddaughter | — | Illinois |
| 16 | John Nicholson | 51 | Head | Promoter | Iowa |
| 17 | Margaret Nicholson | 51 | Wife | — | Free State |
| 18 | Catherine Nicholson | 23 | Daughter | Clerk | Illinois |
| 19 | James Nicholson | 21 | Son | Clerk | Illinois |
| 20 | John Nicholson | 20 | Son | Clerk | Illinois |
| 21 | Mary Nicholson THIS PERSON | 18 | Daughter | Typist | Illinois |
| 22 | Margaret Nicholson | 14 | Daughter | — | Illinois |
| 23 | Florence Nicholson | 12 | Daughter | — | Illinois |
| 24 | Lucille Nicholson | 10 | Daughter | — | Illinois |
| 25 | William Nicholson | 6 | Son | — | Illinois |
| 26 | George Covington | 46 | Head | Electrician | Indiana |
| 27 | Alice Covington | 42 | Wife | Operator | Illinois |
| 28 | George Jr Covington | 21 | Son | — | Illinois |
| 29 | Roger Greene | 22 | Boarder | — | Free State |
| 30 | Charles Montgomery | 62 | Head | Laborer | Canada |
| 31 | Frances Montgomery | 64 | Wife | — | Canada |
| 32 | William Houlihan | 30 | Boarder | Laborer | New Hampshire |
| 33 | Frank Houlihan | 30 | Boarder | Laborer | New Hampshire |
| 34 | Anna Craig | 53 | Boarder | — | New York |
| 35 | Patrick Mcbride | 57 | Head | Laborer | Free State |
| 36 | Anna Mcbride | 52 | Wife | — | Free State |
| 37 | Cornelius Mcbride | 28 | Son | Helper | Illinois |
| 38 | Patrick Mcbride | 23 | Son | Chauffeur | Illinois |
| 39 | Margaret Mcbride | 17 | Daughter | — | Illinois |
| 40 | Cornelius Mcbride | 14 | Son | — | Illinois |
| 41 | James Johnston | 70 | Head | Janitor | Northern Ireland |
| 42 | Mary Johnston | 63 | Wife | — | Free State |
| 43 | James W Johnston | 26 | Son | Operator | Illinois |
| 44 | Sarah Johnston | 23 | Daughter | File Clerk | Illinois |
| 45 | William Johnston | 21 | Son | Clerk | Illinois |
| 46 | John L O'Neil | 37 | Head | Attendant | Illinois |
| 47 | Nellie O'Neil | 32 | Wife | — | Illinois |
| 48 | Rosemary O'Neil | 7 | Daughter | — | Illinois |
| 49 | Peter J O'Neil | 5 | Son | — | Illinois |
| 50 | Stanley Kujawa | 44 | Head | Proprietor | Poland |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)