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Nels Peterson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Nels Peterson across the 1910, 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1882), then head of a 3-person household.
Age 58
b. ~1882
Male
Head
Born: Sweden
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Peterson |
| Given Name | Nels |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | COOK |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Patrol Officer |
| Industry | Pub. Lic. School |
| Class of Worker | GW |
| Hours Worked | 30 |
| Income (1939) | 650 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
| Occupation | Patrol Officer |
| Township / Ward | Chicago |
| Est. Birth Year | ~1882 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Nels | Age | Birth yr |
|---|---|---|---|---|
| Martha Peterson | Spouse | — | 46 | ~1894 |
| Nels Peterson | Head | — | 58 | ~1882 |
| Elmer Peterson | Son | — | 21 | ~1919 |
Census Appearances
1910
Cook, Illinois
Other, age 28
Cook, Illinois · implied b. ~1882 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Nels |
| Relationship to Head | Partner |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Sweden |
| Children Living | 1900 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Salesman |
| Industry | Fish Market |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1920
Cook, Illinois
Head, age 38
Cook, Illinois · implied b. ~1882 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Nels |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Sweden |
| Year of Immigration | 1897 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Longshore |
| Industry | Stone |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | No |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | R |
| Birth Country | Sweden |
| Year of Naturalization | 1918 |
| Birthplace (normalized) | sweden |
1930
Cook, Illinois
Head, age 48
Cook, Illinois · implied b. ~1882 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Nels |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Sweden |
| Naturalization Status | Naturalized |
| Year of Immigration | 1902 |
| Age at First Marriage | 30 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Structural Iron |
| Industry | Contractor |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | O |
| Home Value / Rent | 6,000 |
| Veteran | No |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1940
Cook-County, Illinois
Head, age 58
Cook-County, Illinois · implied b. ~1882 — 3 household members
| Surname | Peterson |
| Given Name | Nels |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | COOK |
| Naturalization Status | Naturalized |
| Occupation | Patrol Officer |
| Industry | Pub. Lic. School |
| Class of Worker | GW |
| Hours Worked | 30 |
| Income (1939) | 650 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
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 Nels Peterson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Nels Peterson
Head · 1940 · age 58 · b. ~1882 · Illinois
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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-t0627-01014-00443)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frank Pianotto | 25 | Son | Packer | Illinois |
| 42 | Rose Pianotto | 21 | Daughter | — | Louisiana |
| 43 | Oscar Wilson | 44 | Head | Steamfitter | Georgia |
| 44 | Esther Wilson | 52 | Wife | — | Missouri |
| 45 | Lillian Roppel | 40 | Head | — | Illinois |
| 46 | Florence Roppel | 18 | Daughter | — | Illinois |
| 47 | Francis Roppel | 13 | Daughter | — | Illinois |
| 48 | Frank Roppel | 8 | Son | — | Illinois |
| 49 | Salvatore Novello | 74 | Head | — | Italy |
| 50 | Bernard Novello | 36 | Son | Laborer | Illinois |
| 51 | Mary Novello | 28 | Daughter | — | Illinois |
| 52 | Virginia Novello | 23 | Daughter | — | Illinois |
| 53 | Catharine Telancy | 48 | Head | — | Illinois |
| 54 | Dorothy Telancy | 23 | Daughter | — | Illinois |
| 55 | Geraldine Moore | 21 | Daughter | Beauty Operat. | Illinois |
| 56 | John Reasonover | 39 | Lodger | Sheet Metal | Illinois |
| 57 | Arthur Mungenhasser | 51 | Head | Sheet Metal | Illinois |
| 58 | Herbert Mungenhasser | 44 | Brother | Sheet Metal | Illinois |
| 59 | Fred Swanson | 50 | Lodger | — | Illinois |
| 60 | Nels Peterson THIS PERSON | 58 | Head | Patrol Officer | Sweden |
| 61 | Martha Peterson | 46 | Wife | — | Germany |
| 62 | Elmer Peterson | 21 | Son | Tailor | Michigan |
| 63 | Ethel Youngquist | 29 | Head | Typist | No. Dakota |
| 64 | Emma Youngquist | 52 | Mother | — | Sweden |
| 65 | John Youngquist | 24 | Son | Stock Clerk | Minnesota |
| 66 | Clarence Youngquist | 17 | Son | — | Minnesota |
| 67 | George R. Syden | 23 | Lodger | Comptoman | Illinois |
| 68 | Dorothy Syden | 21 | Sister | Office | Illinois |
| 69 | Robert Syden | 19 | Brother | Office | Illinois |
| 70 | Lyle Nelson | 23 | Lodger | Bookkeeper | No. Dak. |
| 71 | Eric Carlson | 42 | Lodger | Painter | Sweden |
| 72 | James Deschamps | 24 | Lodger | Clerk | Indiana |
| 73 | Florent Deschamps | 52 | Lodger | Kitchen | Belgium |
| 74 | Andrew Nyberg | 32 | Lodger | Building | Sweden |
| 75 | Gust O. Johnson | 32 | Lodger | Machinist | Sweden |
| 76 | Karl O. Janson | 37 | Lodger | Machinist | Sweden |
| 77 | Christ Hanson | 58 | Head | Butcher | Denmark |
| 78 | Esther Hanson | 51 | Wife | — | Illinois |
| 79 | Edwin Hanson | 29 | Son | Butcher | Illinois |
| 80 | Herb Hanson | 27 | Son | Butcher | 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)