WM
William Mcdermott — 1940 US Census Record
Model Tree available1940 United States Federal Census · Sangamon-County, Illinois
Our Model Tree links this William Mcdermott across the 1920, 1930 and 1940 US Censuses in Sangamon-County, Illinois (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1910), then head of a 3-person household.
Age 30
b. ~1910
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Sangamon-County, Illinois |
| Surname | McDermott |
| Given Name | William C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Springfield City |
| 1935 Residence (County) | Sangamon |
| Additional Details | |
| Occupation | Coal miner |
| Industry | Coal mine |
| Class of Worker | PW |
| Hours Worked | 21 |
| Income (1939) | 800 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Coal Miner |
| Township / Ward | Springfield City |
| Est. Birth Year | ~1910 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| John Mcdermott | Head | — | 73 | ~1867 |
| Bertha Mcdermott | Spouse | — | 60 | ~1880 |
| William Mcdermott | Son | — | 30 | ~1910 |
Census Appearances
1920
Sangamon, Illinois
Son, age 10
Sangamon, Illinois · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Willie |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Indiana |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Sangamon, Illinois
Son, age 21
Sangamon, Illinois · implied b. ~1909 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | Miner |
| Industry | Coal Mine |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Sangamon-County, Illinois
Son, age 30
Sangamon-County, Illinois · implied b. ~1910 — 3 household members
| Surname | McDermott |
| Given Name | William C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Springfield City |
| 1935 Residence (County) | Sangamon |
| Occupation | Coal miner |
| Industry | Coal mine |
| Class of Worker | PW |
| Hours Worked | 21 |
| Income (1939) | 800 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 Mcdermott across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Mcdermott (~0.92 confidence) and father John Mcdermott (~0.92 confidence) and mother Bertha Mcdermott (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Mcdermott
b. ~1867
Source father
● Household
· direct · ~0.92
Father
John Mcdermott
b. ~1868
Source father
● Household
· direct · ~0.92
Mother
Bertha Mcdermott
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Mcdermott
Son · 1940 · age 30 · b. ~1910 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Sangamon-County, Illinois
Open full size
1940 US Federal Census — Sangamon-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00884-00748)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Watson | None | — | — | — |
| 42 | Anthony Yakst | 45 | Head | Proprietor | Lithuania |
| 43 | Paul Yakst | 81 | Father | — | Lithuania |
| 44 | Ann Yakst | 79 | Mother | — | Lithuania |
| 45 | Mona Petrovich | 42 | Sister | Grocery Clerk | Lithuania |
| 46 | Frances Petrovich | 17 | Niece | — | Illinois |
| 47 | Rilla Mcclain | 40 | Head | Laborer | Illinois |
| 48 | Jean Mcclain | 33 | Wife | — | Illinois |
| 49 | John Mcclain | 12 | Son | — | Illinois |
| 50 | Alec Oberman | 43 | Head | Proprietor | Russia |
| 51 | Bessie Oberman | 41 | Wife | — | Russia |
| 52 | Morton Oberman | 18 | Son | — | Missouri |
| 53 | Ethel M. Oberman | 12 | Daughter | — | Illinois |
| 54 | Jacob Oberman | 69 | Father | — | Russia |
| 55 | Minnie Oberman | 68 | Mother | — | Russia |
| 56 | William Urban | 23 | Head | Mattress Maker | Illinois |
| 57 | Anna Urban | 19 | Wife | Folder | Illinois |
| 58 | Ernest Smith | 24 | Head | Supervising Clerk | Illinois |
| 59 | Irene Smith | 24 | Wife | — | Illinois |
| 60 | Joan Smith | 2 | Daughter | — | Illinois |
| 61 | Mike Cavall | 54 | Head | Coal Miner | Hungary |
| 62 | Richard Patter | 81 | Head | Superintendent | England |
| 63 | Irene Hamrick | 29 | Daughter | — | Illinois |
| 64 | Delores Hamrick | 9 | Granddaughter | — | Illinois |
| 65 | John Sr. Mcdermott | 73 | Head | — | Illinois |
| 66 | Bertha Mcdermott | 60 | Wife | — | Indiana |
| 67 | William C. Mcdermott THIS PERSON | 30 | Son | Coal Miner | Indiana |
| 68 | Thomas Campbell | 48 | Head | Labourer | Illinois |
| 69 | Ona Campbell | 44 | Wife | — | Illinois |
| 70 | Ida M. Campbell | 17 | Daughter | New Worker | Illinois |
| 71 | Mary Campbell | 9 | Daughter | — | Illinois |
| 72 | Thomas Campbell | 18 | Son | New Worker | Illinois |
| 73 | Pearl Campbell | 6 | Son | — | Illinois |
| 74 | Charles Campbell | 4 | Son | — | Illinois |
| 75 | Iva Michael | 25 | Daughter | — | Illinois |
| 76 | Ruth Colma | 18 | Daughter | — | Illinois |
| 77 | Helen Reabe | 15 | Daughter | — | Illinois |
| 78 | Ona Reed | 23 | Daughter | — | Illinois |
| 79 | Adam Razemetzky | 55 | Head | Laborer | Lithuania |
| 80 | Nancy Razemetzky | 44 | Wife | — | Lithuania |
Pedigree Summary
William
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)