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John Gustafson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Gustafson across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 6-person household.
Age 12
b. ~1928
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Gustafson |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1928 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Nicoline Gustafson | Spouse | — | 37 | ~1903 |
| John Gustafson | Head | — | 41 | ~1899 |
| Andrew Gustafson | Son | — | 10 | ~1930 |
| Robert Gustafson | Son | — | 7 | ~1933 |
| John Gustafson | Son | — | 12 | ~1928 |
| Sarah Gustafson | Daughter | — | 7 | ~1933 |
Census Appearances
1930
Cook, Illinois
Son, age 3
Cook, Illinois · implied b. ~1927 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Gustafson |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 12
Cook-County, Illinois · implied b. ~1928 — 6 household members
| Surname | Gustafson |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | No 5 |
| 1935 Residence | Illinois |
| 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 John Gustafson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Gustafson
Son · 1940 · age 12 · b. ~1928 · Illinois
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Sibling
Sarah Gustafson
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Gustafson
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Andrew Gustafson
Sibling · 1940 · age 10
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00987-00731)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Wm H Reffert | 41 | Head | Hauling | Pennsylvania |
| 2 | Victoria Reffert | 32 | Wife | — | Illinois |
| 3 | Clarence Meyer | 29 | Head | Elevator Operator | Missouri |
| 4 | Wilma Meyer | 27 | Wife | — | Iowa |
| 5 | Walter Moschel | 27 | Head | Service Man | Illinois |
| 6 | Helen Moschel | 26 | Wife | Gen Office Work | Illinois |
| 7 | Jim A Mercier | 43 | Head | Roofer | Illinois |
| 8 | Florence Mercier | 40 | Wife | Telephone Operator | Illinois |
| 9 | Jim Mercier | 17 | Son | — | Illinois |
| 10 | Florence Mercier | 14 | Daughter | — | Illinois |
| 11 | Geo Gormley | 53 | Head | Policeman | England |
| 12 | Elizabeth R Gormley | 52 | Wife | — | England |
| 13 | John T Gormley | 13 | Son | — | Illinois |
| 14 | Frank Parpart | 33 | Head | Meat Butcher | Illinois |
| 15 | Lucille Parpart | 25 | Wife | — | Illinois |
| 16 | James Nicosia | 34 | Head | Stationary Engineer | Italy |
| 17 | Violet Nicosia | 29 | Wife | — | Illinois |
| 18 | James Jr Nicosia | 5 | Son | — | Illinois |
| 19 | Thomas Lamb | 55 | Head | Pump Operator | England |
| 20 | Hannah Lamb | 40 | Wife | — | England |
| 21 | Robert Lamb | 7 | Son | — | England |
| 22 | Wm H Ihrke | 70 | Head | Tool Maker | Illinois |
| 23 | Mae M Ihrke | 63 | Wife | — | Wisconsin |
| 24 | Myron F Ihrke | 33 | Son | Shipping Clerk | Illinois |
| 25 | John Visich | 62 | Head | Carriage Painter | Austria |
| 26 | Helen Visich | 54 | Wife | Store Keeper | Austria |
| 27 | Roy Visich | 15 | Nephew | — | Illinois |
| 28 | Marie Merrick | 28 | Daughter | Clerk | Illinois |
| 29 | Anne Stern | 44 | Sister in law | Hat Maker | Austria |
| 30 | Fred Stern | 19 | Nephew | Furniture Wrapper | Illinois |
| 31 | John Gustafson | 41 | Head | Receiving Clerk | Sweden |
| 32 | Nicoline Gustafson | 37 | Wife | — | Iowa |
| 33 | John Jr Gustafson THIS PERSON | 12 | Son | — | Illinois |
| 34 | Andrew Gustafson | 10 | Son | — | Illinois |
| 35 | Robert Gustafson | 7 | Son | — | Illinois |
| 36 | Sarah Jean Gustafson | 7 | Daughter | — | Illinois |
| 37 | Earl Zahn | 36 | Head | Automobile Mechanic | Illinois |
| 38 | Pauline Zahn | 34 | Wife | — | Illinois |
| 39 | June Zahn | 13 | Daughter | — | Illinois |
| 40 | Diane Zahn | 8 | Daughter | — | 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)