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Mary Mccoy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Clay-County, Missouri
Our Model Tree links this Mary Mccoy across the 1930 and 1940 US Censuses in Clay-County, Missouri (XGBoost, ~Confirmed) — first a daughter (b.~1927), then head of a 9-person household.
Age 13
b. ~1927
Female
Daughter
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Clay-County, Missouri |
| Surname | McCoy |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (County) | Clay |
| Additional Details | |
| Highest Grade | No 6 |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | Gallatin Township |
| Est. Birth Year | ~1927 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Florence Mccoy | Daughter | — | 11 | ~1929 |
| Marjorie Mccoy | Daughter | — | 16 | ~1924 |
| Mina Mccoy | Daughter | — | 8 | ~1932 |
| Mary Mccoy | Daughter | — | 13 | ~1927 |
| Walter Mccoy | Head | — | 46 | ~1894 |
| Walter Mccoy | Son | — | 5 | ~1935 |
| William Mccoy | Son | — | 17 | ~1923 |
| Chester Mccoy | Son | — | 18 | ~1922 |
| Edna Mccoy | Spouse | — | 38 | ~1902 |
Census Appearances
1930
Jackson, Missouri
Daughter, age 3
Jackson, Missouri · implied b. ~1927 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCoy |
| Given Name | Mary Z. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Occupation | none |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
Clay-County, Missouri
Daughter, age 13
Clay-County, Missouri · implied b. ~1927 — 9 household members
| Surname | McCoy |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (County) | Clay |
| Highest Grade | No 6 |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 Mccoy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mccoy
Daughter · 1940 · age 13 · b. ~1927 · Missouri
★ You are viewing this record
Sibling
Marjorie Mccoy
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mccoy
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Mccoy
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Chester Mccoy
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Mccoy
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mina Mccoy
Sibling · 1940 · age 8
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 — Clay-County, Missouri
Open full size
1940 US Federal Census — Clay-County, Missouri
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02097-00456)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ruth L Stane | 8 | Daughter | — | Missouri |
| 42 | Charles E Stane | 6 | Son | — | Missouri |
| 43 | Dorothy L Stane | 3 | Daughter | — | Missouri |
| 44 | John H Stane | 1 | Son | — | Missouri |
| 45 | Victor L Mays | 26 | Head | Cost Accounting | Missouri |
| 46 | Fern Mays | 29 | Wife | — | Missouri |
| 47 | Donald S Mays | 5 | Son | — | Missouri |
| 48 | Barbara J Mays | 3 | Daughter | — | Missouri |
| 49 | Earl G Plumb | 38 | Head | Superintendent | Nebraska |
| 50 | Artha Plumb | 34 | Wife | — | Oklahoma |
| 51 | Patricia A Plumb | 10 | Daughter | — | Kansas |
| 52 | Nancy L Plumb | 1 | Daughter | — | Missouri |
| 53 | Alma F Lilley | 43 | Head | Box Folder | Missouri |
| 54 | Mary L Lilley | 14 | Daughter | — | Missouri |
| 55 | Fred A Lilley | 13 | Son | — | Missouri |
| 56 | James C Hildreth | 22 | Other | — | Missouri |
| 57 | Matthew J Hildreth | 56 | Brother | — | Missouri |
| 58 | Charles R Pythe | 39 | Head | Yard Clerk | Arkansas |
| 59 | Lorena J Pythe | 34 | Wife | — | Arkansas |
| 60 | Charles R Pythe | 15 | Son | — | Arkansas |
| 61 | Donna J Pythe | 6 | Daughter | — | Missouri |
| 62 | C Christopher | 62 | Father | — | Missouri |
| 63 | Walter H Mccoy | 46 | Head | Loader | Missouri |
| 64 | Edna M Mccoy | 38 | Wife | — | Kansas |
| 65 | Chester H Mccoy | 18 | Son | — | Missouri |
| 66 | William Mccoy | 17 | Son | — | Missouri |
| 67 | Marjorie A Mccoy | 16 | Daughter | — | Missouri |
| 68 | Mary E Mccoy THIS PERSON | 13 | Daughter | — | Missouri |
| 69 | Florence J Mccoy | 11 | Daughter | — | Missouri |
| 70 | Mina L Mccoy | 8 | Daughter | — | Missouri |
| 71 | Walter Marion Mccoy | 5 | Son | — | Missouri |
| 72 | Carl F Meyers | 48 | Head | Civil Engineer | Illinois |
| 73 | Ethel F Meyers | 47 | Wife | — | Illinois |
| 74 | John V Meyers | 19 | Son | — | Illinois |
| 75 | Wayne C Pierce | 32 | Head | Building Maintenance | Virginia |
| 76 | Mabell L Pierce | 26 | Wife | — | Illinois |
| 77 | Richard S Pierce | 1 | Son | — | Missouri |
| 78 | John C Fowler | 45 | Head | Presser | Tennessee |
| 79 | Elizabeth C Fowler | 39 | Wife | — | Tennessee |
| 80 | John C Fowler | 16 | Son | — | Tennessee |
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)