MG
Mary Grace — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Macon-County, Illinois
Our Model Tree links this Mary Grace across the 1930 and 1940 US Censuses in Macon-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 6-person household.
Age 18
b. ~1922
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Macon-County, Illinois |
| Surname | Grace |
| Given Name | Mary Kathryn |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Decatur |
| 1935 Residence (County) | Macon |
| Additional Details | |
| Highest Grade | C 1 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Decatur |
| Est. Birth Year | ~1922 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Joan Grace | Daughter | — | 11 | ~1929 |
| Mary Grace | Daughter | — | 18 | ~1922 |
| Robert Grace | Son | — | 19 | ~1921 |
| Alice Grace | Daughter | — | 9 | ~1931 |
| Margaret Grace | Daughter | — | 17 | ~1923 |
| Kathryn Grace | Head | — | 49 | ~1891 |
Census Appearances
1930
Macon, Illinois
Daughter, age 8
Macon, Illinois · implied b. ~1922 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Grace |
| Given Name | Mary Kathryn |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Macon-County, Illinois
Daughter, age 18
Macon-County, Illinois · implied b. ~1922 — 6 household members
| Surname | Grace |
| Given Name | Mary Kathryn |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Decatur |
| 1935 Residence (County) | Macon |
| Highest Grade | C 1 |
| 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 Grace across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Grace
Daughter · 1940 · age 18 · b. ~1922 · Illinois
★ You are viewing this record
Sibling
Robert Grace
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Grace
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Grace
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Grace
Sibling · 1940 · age 9
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 — Macon-County, Illinois
Open full size
1940 US Federal Census — Macon-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00844-00214)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Marjorie Spangler | 34 | Wife | — | Illinois |
| 42 | Jeannine Spangler | 10 | Daughter | — | Illinois |
| 43 | Sandra Spangler | 8 | Daughter | — | Illinois |
| 44 | Rodney 2Nd Spangler | 3 | Son | — | Illinois |
| 45 | Maude M. Lancaster | 60 | Head | — | Illinois |
| 46 | Margaret Lancaster | 34 | Daughter | School Teacher | Illinois |
| 47 | Kathryn Grace | 49 | Head | — | Illinois |
| 48 | Robert R. Grace | 19 | Son | Clerk | Illinois |
| 49 | Mary Kathryn Grace THIS PERSON | 18 | Daughter | — | Illinois |
| 50 | Margaret Ellen Grace | 17 | Daughter | — | Illinois |
| 51 | Joan Rose Grace | 11 | Daughter | — | Illinois |
| 52 | Alice Jane Grace | 9 | Daughter | — | Illinois |
| 53 | Mary E. Vernon | 79 | Head | — | Illinois |
| 54 | Anna Elizabeth Marshall | 65 | Lodger | — | Illinois |
| 55 | Paul B. Berryhill | 36 | Head | Dentist | Illinois |
| 56 | Edna Berryhill | 32 | Wife | — | Illinois |
| 57 | Betty Ann Berryhill | 2 | Daughter | — | Illinois |
| 58 | Esther Barker | 18 | Maid | Maid | Illinois |
| 59 | Wilbur D. Moore | 61 | Head | Laborer | Illinois |
| 60 | Margaret Moore | 49 | Wife | — | Montana |
| 61 | Marjorie Moore | 25 | Daughter | Office Girl | Illinois |
| 62 | Ida Batchelder | 63 | Head | — | Illinois |
| 63 | Lulu M. Leonard | 63 | Companion | Companion | Ohio |
| 64 | H. W. Metzler | 71 | Head | General Mgr. | Illinois |
| 65 | Lena G. Metzler | 68 | Wife | — | Illinois |
| 66 | Wm Stanley Threlfall | 57 | Head | Yard Foreman | England |
| 67 | Marguerite Threlfall | 51 | Wife | — | Illinois |
| 68 | Stanley Jr. Threlfall | 21 | Son | Salesman | Illinois |
| 69 | Frances S. Neal | 80 | Mother-in-law | — | New York |
| 70 | Beryl Edwards | 48 | Head | Supt. | Illinois |
| 71 | Irene Edwards | 37 | Wife | — | Illinois |
| 72 | Patricia Edwards | 11 | Daughter | — | Illinois |
| 73 | Beryl Jr. Edwards | 7 | Son | — | Illinois |
| 74 | Phillip Edwards | 1 | Son | — | Illinois |
| 75 | L. W. Keller | 37 | Head | Salesman | Indiana |
| 76 | Lucille Keller | 37 | Wife | — | Indiana |
| 77 | Barbara Ann Keller | 1 | Daughter | — | Iowa |
| 78 | Jesse R. Burkholder | 48 | Head | Manager | Illinois |
| 79 | Nellie A. Burkholder | 50 | Wife | — | Indiana |
| 80 | Jesse Eugene Burkholder | 19 | Son | — | 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)