WM
William Muller — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Muller across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 7-person household.
Age 15
b. ~1925
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Muller |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1925 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Mabel Muller | Spouse | — | 30 | ~1910 |
| Arlette Muller | Daughter | — | 11 | ~1929 |
| Robert Muller | Son | — | 8 | ~1932 |
| Dolores Muller | Daughter | — | 6 | ~1934 |
| William Muller | Son | — | 15 | ~1925 |
| William Muller | Head | — | 35 | ~1905 |
| Charles Muller | Daughter | — | 13 | ~1927 |
Census Appearances
1930
Cook, Illinois
Son, age 5
Cook, Illinois · implied b. ~1925 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Miller |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 15
Cook-County, Illinois · implied b. ~1925 — 7 household members
| Surname | Muller |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Highest Grade | No 8 |
| 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 William Muller across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Muller
Son · 1940 · age 15 · b. ~1925 · Illinois
★ You are viewing this record
Sibling
Robert Muller
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dolores Muller
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Muller
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arlette Muller
Sibling · 1940 · age 11
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-t0627-00990-00075)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Martha Van Leeuwen | 48 | Wife | — | Netherlands |
| 42 | Cornelius Jr. Van Leeuwen | 20 | Son | Mechanic | Netherlands |
| 43 | William Van Leeuwen | 17 | Son | New Boy | Netherlands |
| 44 | William Muller | 35 | Head | Artist | Illinois |
| 45 | Mabel Muller | 30 | Wife | — | Illinois |
| 46 | William Jr. Muller THIS PERSON | 15 | Son | — | Illinois |
| 47 | Charles Muller | 13 | Daughter | — | Illinois |
| 48 | Arlette Muller | 11 | Daughter | — | Illinois |
| 49 | Robert Muller | 8 | Son | — | Illinois |
| 50 | Dolores Muller | 6 | Daughter | — | Illinois |
| 51 | Jacob G. Ditten | 60 | Head | Shoemaker | Russia |
| 52 | Grace Wimmermark | 47 | Head | — | Illinois |
| 53 | Robert Wimmermark | 28 | Son | Credit Man | Illinois |
| 54 | Selma Wimmermark | 25 | Daughter-in-law | Stenographer | Illinois |
| 55 | Mary Lou Olsen | 9 | Niece | — | Illinois |
| 56 | William H. Nelson | 59 | Head | Pool Clerk | Illinois |
| 57 | Isabell Nelson | 56 | Wife | — | Illinois |
| 58 | William T. Nelson | 15 | Son | — | Illinois |
| 59 | Fred Langer | 61 | Head | Night Watchman | Austria |
| 60 | Sophie Langer | 47 | Wife | — | Austria |
| 61 | Richard Schreiber | 61 | Head | Elevator Operator | Illinois |
| 62 | Inez Schreiber | 47 | Wife | — | Tennessee |
| 63 | Rose Barnett | 28 | Head | Assembler | Wisconsin |
| 64 | John Naturie | 38 | Lodger | — | Minnesota |
| 65 | Stanley Seagren | 30 | Head | Coal Man | Illinois |
| 66 | Nadine Seagren | 19 | Wife | — | Ohio |
| 67 | Robert Seagren | 0 | Son | — | Illinois |
| 68 | Adolph Bessler | 58 | Head | Baker | Germany |
| 69 | Martha Bessler | 28 | Daughter | — | Illinois |
| 70 | Stephen Seplak | 61 | Head | Meat Handler | Slovakia |
| 71 | Susanna Seplak | 56 | Wife | — | Slovakia |
| 72 | Olga Seplak | 20 | Daughter | Coil Winder | Illinois |
| 73 | Stephen Bielko | 48 | Brother-in-law | Watchman | Slovakia |
| 74 | Stephen Jr. Seplak | 29 | Head | Die Caster | Illinois |
| 75 | Catherine Seplak | 23 | Wife | — | Illinois |
| 76 | Stephen Seplak | 2 | Son | — | Illinois |
| 77 | Arnold Rueger | 37 | Head | Painter | Illinois |
| 78 | Viola Rueger | 31 | Wife | — | Iowa |
| 79 | Kamilla Danat | 25 | Lodger | Saleswoman | Iowa |
| 80 | Frederick W. Jacob | 63 | Head | — | Germany |
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)