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Mary Wallace — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Warren-County, Illinois
Our Model Tree links this Mary Wallace across the 1930 and 1940 US Censuses in Warren-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 10-person household.
Age 17
b. ~1923
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Warren-County, Illinois |
| Surname | Wallace |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Monmouth |
| 1935 Residence (County) | Warren |
| Additional Details | |
| Occupation | House maid |
| Industry | Private family |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 520 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | House Maid |
| Township / Ward | Monmouth |
| Est. Birth Year | ~1923 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Joyal Wallace | Daughter | — | 2 | ~1938 |
| Mary Wallace | Daughter | — | 17 | ~1923 |
| Maria Wallace | Daughter | — | 8 | ~1932 |
| Mamie Wallace | Daughter | — | 10 | ~1930 |
| Camilla Wallace | Daughter | — | 7 | ~1933 |
| M Wallace | Head | — | 46 | ~1894 |
| Leroy Wallace | Son | — | 3 | ~1937 |
| Henry Wallace | Son | — | 13 | ~1927 |
| Kenneth Wallace | Son | — | 19 | ~1921 |
| Lutha Wallace | Spouse | — | 20 | ~1920 |
Census Appearances
1930
Warren, Illinois
Daughter, age 7
Warren, Illinois · implied b. ~1923 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Wallace |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Missouri |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Warren-County, Illinois
Daughter, age 17
Warren-County, Illinois · implied b. ~1923 — 10 household members
| Surname | Wallace |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Monmouth |
| 1935 Residence (County) | Warren |
| Occupation | House maid |
| Industry | Private family |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 520 |
| 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 Mary Wallace across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Wallace
Daughter · 1940 · age 17 · b. ~1923 · Illinois
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Sibling
Mamie Wallace
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henry Wallace
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Camilla Wallace
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joyal Wallace
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maria Wallace
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leroy Wallace
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kenneth Wallace
Sibling · 1940 · age 19
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 — Warren-County, Illinois
Open full size
1940 US Federal Census — Warren-County, Illinois
Page Contents
36 people indexed on this census page (nara:1940:m-t0627-00901-00406)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | M. Raymond Wallace | 46 | Head | House Work | Missouri |
| 42 | Lutha J. Wallace | 20 | Wife | Common Labor | Illinois |
| 43 | Kenneth L. Wallace | 19 | Son | — | Illinois |
| 44 | Mary A. Wallace THIS PERSON | 17 | Daughter | House Maid | Illinois |
| 45 | Henry L. Wallace | 13 | Son | — | Illinois |
| 46 | Mamie C. Wallace | 10 | Daughter | — | Illinois |
| 47 | Maria A. Wallace | 8 | Daughter | — | Illinois |
| 48 | Camilla Wallace | 7 | Daughter | — | Illinois |
| 49 | Leroy Wallace | 3 | Son | — | Illinois |
| 50 | Joyal E. Wallace | 2 | Daughter | — | Illinois |
| 52 | Ellsworth De Jaynes | 27 | Head | Section Hand | Illinois |
| 53 | Gertrude B. De Jaynes | 26 | Wife | Chamber Maid | Illinois |
| 54 | Arnie E. Coffman | 41 | Head | Common Labor | Kentucky |
| 55 | Bertha Coffman | 41 | Wife | — | Illinois |
| 56 | Richard L. Coffman | 13 | Son | — | Illinois |
| 57 | Robert L. Coffman | 11 | Son | — | Illinois |
| 58 | Laurence R. Coffman | 10 | Son | — | Illinois |
| 59 | Chas. Mc Lain | 58 | Head | Carpenter | Illinois |
| 60 | Endora M. Mc Lain | 25 | Wife | — | Illinois |
| 61 | Beverly A. Mc Lain | 4 | Daughter | — | Illinois |
| 62 | Edward Mc Lain | 2 | Son | — | Illinois |
| 63 | Jerry L. Mc Lain | 1 | Son | — | Illinois |
| 66 | Russell Sowder | 36 | Head | Common Labor | Iowa |
| 67 | Imogene Sowder | 26 | Wife | — | Illinois |
| 68 | James C. Clark | 56 | Head | Delivery | Illinois |
| 69 | Agnes G. Clark | 53 | Wife | Laundress | Illinois |
| 70 | Earl G. Clark | 28 | Son | Delivery | Illinois |
| 71 | Irvin Clark | 28 | Son | Common Labor | Illinois |
| 72 | June P. Clark | 20 | Daughter | Finisher | Illinois |
| 73 | Dorothy Clark | 17 | Daughter | — | Illinois |
| 74 | Esther M. Brownlee | 28 | Head | House Work | Illinois |
| 76 | Bryan H. Miller | 40 | Head | Farm Work | Kentucky |
| 77 | Pearl A. Miller | 47 | Wife | — | Iowa |
| 78 | Lewis L. Salmons | 58 | Head | Sheet Welder | Illinois |
| 79 | Minnie I. Salmons | 42 | Wife | — | Missouri |
| 80 | Audrey L. Salmons | 15 | Daughter | — | Missouri |
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)