MC
Mary Chapman — 1940 US Census Record
Linked across censuses1940 United States Federal Census · King-County, Washington
Our Model Tree links this Mary Chapman across the 1930 and 1940 US Censuses in King-County, Washington (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 10-person household.
Age 19
b. ~1921
Female
Daughter
Born: North Dakota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | King-County, Washington |
| Surname | Chapman |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | North Dakota |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Steel Millwork |
| Class of Worker | PW |
| Hours Worked | 33 |
| Income (1939) | 300 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
| Occupation | Stenographer |
| Township / Ward | Seattle City |
| Est. Birth Year | ~1921 |
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 |
|---|---|---|---|---|
| Marlys Chapman | Daughter | — | 16 | ~1924 |
| Mary Chapman | Daughter | — | 19 | ~1921 |
| Eileen Chapman | Daughter | — | 14 | ~1926 |
| Lois Chapman | Daughter | — | 22 | ~1918 |
| Norah Chapman | Daughter | — | 17 | ~1923 |
| Clarence Chapman | Head | — | 47 | ~1893 |
| John Chapman | Son | — | 10 | ~1930 |
| Donald Chapman | Son | — | 13 | ~1927 |
| Robert Chapman | Son | — | 20 | ~1920 |
| Effie Chapman | Spouse | — | 48 | ~1892 |
Census Appearances
1930
King, Washington
Other, age 7
King, Washington · implied b. ~1923 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Chapman |
| Given Name | Mary |
| Relationship to Head | Niece |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | North Dakota |
| Father's Birthplace | Nebraska |
| Mother's Birthplace | North Dakota |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
1940
King-County, Washington
Daughter, age 19
King-County, Washington · implied b. ~1921 — 10 household members
| Surname | Chapman |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | North Dakota |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Occupation | Stenographer |
| Industry | Steel Millwork |
| Class of Worker | PW |
| Hours Worked | 33 |
| Income (1939) | 300 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
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 Chapman across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Chapman
Daughter · 1940 · age 19 · b. ~1921 · Washington
★ You are viewing this record
Sibling
Norah Chapman
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Chapman
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Chapman
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marlys Chapman
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lois Chapman
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Chapman
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Chapman
Sibling · 1940 · age 13
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 — King-County, Washington
Open full size
1940 US Federal Census — King-County, Washington
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-04383-00963)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | David Carter | 58 | Head | Floor Finisher | Kansas |
| 2 | Marie Carter | 55 | Wife | — | Minnesota |
| 3 | Eugene Martin | 59 | Head | Construction Engineer | Colorado |
| 4 | Stella Martin | 61 | Wife | — | Wisconsin |
| 5 | Peter Martin | 20 | Son | Salesman | Washington |
| 6 | Clarence Chapman | 47 | Head | Operating Engineer | Nebraska |
| 7 | Effie Chapman | 48 | Wife | — | North Dakota |
| 8 | Lois Chapman | 22 | Daughter | Saleswoman | North Dakota |
| 9 | Robert Chapman | 20 | Son | Machinery Oiler | North Dakota |
| 10 | Mary Chapman THIS PERSON | 19 | Daughter | Stenographer | North Dakota |
| 11 | Norah Chapman | 17 | Daughter | Housework | North Dakota |
| 12 | Marlys Chapman | 16 | Daughter | — | North Dakota |
| 13 | Eileen Chapman | 14 | Daughter | — | North Dakota |
| 14 | Donald Chapman | 13 | Son | — | North Dakota |
| 15 | John Chapman | 10 | Son | — | North Dakota |
| 16 | J. Daniel Hedrick | 34 | Head | Truck Driver | Massachusetts |
| 17 | Melva Hedrick | 25 | Wife | — | Washington |
| 18 | Daniel Lee Hedrick | 2 | Son | — | Washington |
| 19 | Emma Maguire | 72 | Lodger | — | Minnesota |
| 20 | Josephine Nedholdt | 80 | Lodger | — | Wisconsin |
| 21 | Millie Young | 81 | Lodger | — | Pennsylvania |
| 22 | David Corwin | 74 | Lodger | — | Pennsylvania |
| 23 | A. Mccullough | 77 | Lodger | — | Michigan |
| 24 | Katie Thomas | 67 | Lodger | — | Kansas |
| 25 | Calla Courtney | 86 | Lodger | — | Georgia |
| 26 | Myrtle Nelson | 57 | Lodger | Head Waitress | Kansas |
| 27 | Olaf Sandelin | 65 | Lodger | — | Sweden |
| 28 | Alfred Lindquist | 69 | Lodger | — | Sweden |
| 29 | Otto Ritter | 89 | Lodger | — | Illinois |
| 30 | Louis Uras | 76 | Lodger | — | Kansas |
| 31 | Lewis Thompson | 55 | Lodger | Janitor | South Dakota |
| 32 | John Cameron | 84 | Lodger | — | Scotland |
| 33 | Marie Williams | 37 | Lodger | Charge Nurse | Nebraska |
| 34 | Alice Ruffner | 79 | Lodger | — | Wisconsin |
| 35 | Hanna Cedergren | 78 | Lodger | — | Sweden |
| 36 | Emilie Lounsbury | 69 | Lodger | — | Michigan |
| 37 | Francis Mccauley | 86 | Lodger | — | New York |
| 38 | Lena Weitendorf | 86 | Lodger | — | 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)