MS
Mary Swanson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Snohomish-County, Washington
Our Model Tree links this Mary Swanson across the 1930 and 1940 US Censuses in Snohomish-County, Washington (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 6-person household.
Age 10
b. ~1930
Female
Daughter
Born: Washington
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Snohomish-County, Washington |
| Surname | Swanson |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Snohomish |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Washington |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Township / Ward | Arlington |
| Est. Birth Year | ~1930 |
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 |
|---|---|---|---|---|
| Lincoln Swanson | Head | — | 30 | ~1910 |
| Marilyn Swanson | Daughter | — | 8 | ~1932 |
| Sally Swanson | Daughter | — | 5 | ~1935 |
| Mary Swanson | Daughter | — | 10 | ~1930 |
| Lucille Swanson | Spouse | — | 27 | ~1913 |
| Thelma Swanson | Daughter | — | 9 | ~1931 |
Census Appearances
1930
Snohomish, Washington
Daughter, age
Snohomish, Washington · implied b. ~1930 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Swanson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Washington |
| Mother's Birthplace | Washington |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
Snohomish-County, Washington
Daughter, age 10
Snohomish-County, Washington · implied b. ~1930 — 6 household members
| Surname | Swanson |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Snohomish |
| Highest Grade | Hs 4 |
| 1935 Residence | Washington |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
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 Swanson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Swanson
Daughter · 1940 · age 10 · b. ~1930 · Washington
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Sibling
Marilyn Swanson
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sally Swanson
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thelma Swanson
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 — Snohomish-County, Washington
Open full size
1940 US Federal Census — Snohomish-County, Washington
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04358-00214)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ole Gunderson | 44 | Head | Laborer | North Dakota |
| 42 | Frances G. Gunderson | 37 | Wife | — | North Dakota |
| 43 | Ralph E. Gunderson | 14 | Son | — | North Dakota |
| 44 | Esther A. Gunderson | 12 | Daughter | — | North Dakota |
| 45 | Carol E. Gunderson | 10 | Daughter | — | North Dakota |
| 46 | Doris G. Gunderson | 8 | Daughter | — | North Dakota |
| 47 | Donna C. Gunderson | 4 | Daughter | — | Washington |
| 48 | William H. Fowler | 55 | Head | Insurance And Real Estate Agent | Iowa |
| 49 | Birdie E. Fowler | 56 | Wife | — | Illinois |
| 50 | Clarence H. Fowler | 27 | Son | — | Washington |
| 51 | Charles W. Fowler | 18 | Son | — | Washington |
| 52 | Caroline O. Wedding | 90 | Mother in law | — | Ohio |
| 53 | James Walker | 45 | Head | Laborer | Wisconsin |
| 54 | Anna Walker | 40 | Wife | — | Sweden |
| 55 | Signa M. Walker | 19 | Daughter | — | Washington |
| 56 | James E. Walker | 17 | Son | — | Washington |
| 57 | Bonnie A. Walker | 14 | Daughter | — | Washington |
| 58 | Catherine E. Walker | 4 | Daughter | — | Washington |
| 59 | Jackson H. Parsons | 82 | Head | — | Pennsylvania |
| 60 | Dora E. Parsons | 84 | Wife | — | New York |
| 61 | Effie V. Stanford | 64 | Head | — | Michigan |
| 62 | Kathryn E. Stanford | 41 | Daughter | — | Michigan |
| 63 | Frank V. Nyberg | 72 | Head | — | Sweden |
| 64 | Annie M. Nyberg | 56 | Wife | — | Sweden |
| 65 | Duane W. Nyberg | 17 | Son | — | Washington |
| 66 | Charles M. Benedict | 81 | Head | — | New York |
| 67 | Leroy G. Benedict | 50 | Son | Packing | Michigan |
| 68 | Bertha A. Benedict | 45 | Daughter | Hand Clerk | Michigan |
| 69 | Blanche C. Lane | 63 | Head | — | Kansas |
| 70 | Eugene C. Lane | 32 | Son | — | Kansas |
| 71 | Edward R. Marr | 74 | Head | — | Kentucky |
| 72 | Amelia E. Marr | 73 | Wife | — | Michigan |
| 73 | Lincoln G. Swanson | 30 | Head | Powder-Man | Washington |
| 74 | Lucille D. Swanson | 27 | Wife | — | Washington |
| 75 | Mary A. Swanson THIS PERSON | 10 | Daughter | — | Washington |
| 76 | Thelma R. Swanson | 9 | Daughter | — | Washington |
| 77 | Marilyn J. Swanson | 8 | Daughter | — | Washington |
| 78 | Sally E. Swanson | 5 | Daughter | — | Washington |
| 79 | Mary Rose | 58 | Head | — | Washington |
| 80 | Norman W. Mclean | 28 | Head | Woodsman | Washington |
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)